Packet Format (V1.0)
Format | Length (Byte) | Description |
Start Bit | 2 | 0x78 0x78 (1 byte) or 0x79 0x79 (2 bytes) |
Packet Length | 1(2) | Length = Protocol number + Information content + Information sequence number (SN) + CRC |
Protocol Number | 1 | It indicates the type of the transfer packet (see the following table for details). |
Information Content | N | It is determined by different applications and their "protocol numbers". |
Information SN | 2 | The SN will be automatically added by "1” for each data sending after power-on. |
CRC | 2 | It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details). |
Stop Bit | 2 | It is fixed at 0x0D 0x0A. |
Login Packet (0x01) (V1.0)
Description:
A login packet is used to establish the connection between the terminal and the platform. It carries terminal information.
When the GPRS link is established, the terminal will send a login packet to the server. If a return packet is received within 5 seconds, the link is through; otherwise, the terminal will continue to send login packets.
If no return packet is received within 5 seconds, the terminal will regard it as response timeout.
If the timeout count reaches 3, the terminal will enable timed restart.
Login packet
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x01
Information Content
Terminal ID
8
For example: If the IMEI is "123456789123456", then the terminal ID is "0x01 0x23 0x45 0x67 0x89 0x12 0x34 0x56".
Type Identifier
2
It is used to judge the type of a terminal.
Time Zone/Languag e
2
See the following table for details.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 11 01 07 52 53 36 78 90 02 42 70 00 32 01 00 05 12 79 0D 0A
Time Zone/Language
One and a half byte (bit15–bit4)
15
It is a value calculated by expanding the time zone by 100.
14
13
12
11
10
9
8
7
6
5
4
Lower half byte (bit4– bit0)
3
GMT
2
It is not defined.
1
Language
select bit
1
0
Language select bit
0
Bit30-------Eastern time 1 Western time
If: the extended bit "0X32 0X00" refers to "GMT+8:00",
then the GTM in Hex is "0X0320", which is converted from "8*100=800". The extended bit "0X4D 0XD8" refers to "GMT-12:45",
then the GTM in Hex is "0X04,0XDD", which is converted from "12.45*100=1246".
Here, to save 4 bytes, the calculation result shifts to the left for 4 bits cyclically and combines the eastern time, western time, and language select bit.
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x01
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 01 00 05 9F F8 0D 0A
Time Calibration Packet (0x8a) (V1.0)
Description:
The time calibration packet is sent by the terminal to the server upon power-on to request for time synchronization to resolve the issue of time error when the terminal is not positioned.
The server responds with the correct UTC in correct format.
Time calibration packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x8A
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 8A 00 06 88 29 0D 0A
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x8A (UTC)
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 0B 8A 0F 0C 1D 00 00 15 00 06 F0 86 0D 0A
Heartbeat Status Information Packet (0x23) (V1.0)
Description:
The heartbeat packet is used to maintain GPRS link connectivity.
When the GPRS link is established, the terminal will send a heartbeat packet to the server. If a return packet is received within 5 seconds, the link is through. In this case, new heartbeat packets will be sent in a timed manner.
If no return packet is received within 5 seconds, the terminal will regard it as response timeout.
If the timeout count reaches 3, the terminal will enable timed restart.
Heartbeat packet sent by terminal (0x23)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x23
Information Content
Terminal Information Content
1
See the following table for details.
Voltage Level
2
Conversion method: Convert HEX to decimal and then divide the decimal value by 100.
Take 0X01 0X9F for example, "019F" is "415" in decimal and is "4.15" after being divided by 100, which means
the current voltage of the terminal is 4.15 (see the Attachment for details about the mapping relationship between battery voltage and strength).
GSM Signal Strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Language/Extende d Port Status
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example: 78 78 0B 23 C0 01 22 04 00 01 00 08 18 72 0D 0A
Terminal Information Content Details
It occupies 1 byte and indicates various status information of the mobile phone.
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit4–Bit5
Extended bit
Bit3
Remote lock: 1: Yes; 0: No
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x23
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example: 78 78 05 23 01 00 67 0E 0D 0A
Heartbeat Packet (0x36) (V1.0)
Description:
The heartbeat packet is used to maintain GPRS link connectivity.
When the GPRS link is established, the terminal will send a heartbeat packet to the server. If a return packet is received within 5 seconds, the link is through. In this case, new heartbeat packets will be sent in a timed manner.
If no return packet is received within 5 seconds, the terminal will regard it as response timeout. If the timeout count reaches 3, the terminal will enable its timed restart feature.
This mainly applies to the fake shutdown.
0x36 Heartbeat packet (extension module)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x36 (extension module)
Information Content
Terminal Information Content
1
See the following table for details.
Voltage Level
1
0X00: No power (power off)
0x01: Battery extremely low (making calls or sending SMS's are impossible)
0x02: Battery very low (low battery alert will be triggered) 0x03: Battery low (the device can be used as usual) 0x04: Battery medium
0x05: Battery high
0x06: Battery extremely high
GSM Signal Strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Language/Extended Port Status
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Extension module (protocol 36 is valid)
N
Extension module format byte consists of: module number (2) + module length (1) + module content (N is parsed based on the module number), such as module number 1 module length 1 module content 1 module number 2 module length 2 module content 2 .........
For example: "00 27 02 05 46" means the voltage of the external power is 13.5.
Supported module: 0x18 0x32
0x40
See the Attachment for details.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
i. Terminal information content details
It occupies 1 byte and indicates various status information of the mobile phone.
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit4–Bit5
Extended bit
Bit3
Remote lock: 1: Yes; 0: No
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x36
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 36 01 00 DB 26 0D 0A
GPS Location Packet over 2G (0x22) (V1.0)
Description:
The location packet carries the location data of the terminal.
After the GPS module is positioned and the connection is established, the terminal will upload data about fixes by preset rules.
After the connection is established and there are cache fixes, the terminal will upload these cache fixes.
a) Location packet sent by terminal (0x22)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x22 (UTC) If the protocol number is "0x2D", then it is a location packet that requires a response; if the server doesn't respond, then a backup action will be performed.
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Number of Satellites
1
The first character refers to GPS Information Length; while the second character refers to Number of Satellites that involve in positioning (which must convert to decimal).
Latitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Longitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Speed
1
It is a value in decimal.
Course and Status
2
Convert to a 16-bit binary. Please calculate by bit (see i for details)).
MCC
2
Mobile Country Code (convert to decimal) The MSB of the MCC is 1 and the MNC occupies 2 bytes.
MNC
1 (or 2)
Mobile Network Code (convert to decimal)
LAC
2
Location Area Code (convert to decimal)
Cell ID
3
Cell Tower ID (convert to decimal)
ACC
1
It refers to the ACC status, where "00" means ACC off and "01" ACC on (unavailable on GT06)
Data upload mode
1
GPS data point upload type (unavailable on GT06) 0x00: Upload in fixed interval
0x01: Upload at fixed distance 0x02: Upload at cornering point
0x03: Upload upon ACC status change
0x04: Upload the last fix after the status changes from moving to still
0x05: Upload the last valid fix prior to reconnection from a network interruption
0x06: Force to upload a GPS fix upon ephemeris refresh 0x07: Upload a fix upon key press
0x08: Upload location information upon power-on 0x09: Not used
0x0A: Upload the last longitude and latitude and update the time after the device goes still
0x0B: Parse the uploaded longitude and latitude packet over WiFi 0x0C: Upload upon LJDW (immediate position) command
0x0D: Upload the last longitude and latitude after the device goes still 0x0E: GPSDUP upload (upload at a fixed interval in still state)
0x0F: Exit tracking mode
GPS data re-upload
1
0x00: Real-time upload; 0x01: Re-upload (unavailable on GT06)
Mileage statistics
4
Convert to decimal to get the result (for products without this feature, there is no such place in the packet)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 22 22 15 08 17 06 0B 3A CF 03 2E EA 80 0B 6C E1 10 00 14 00 00 00 00 00
00 00 00 00 01 09 00 00 1C 66 25 0D 0A
The reserved place occupies 2 bytes.
One and a half byte (bit15–bit4)
Lower half byte (bit4–bit0)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
It is not defined.
Lang uage selec t bit
1
Lang uage selec t bit
0
Language select bit 0=1 (or 0) and language select bit 1=0: This means to request in SMS the backend system to return the location information in Chinese.
Language select bit 0=0 and language select bit 1=1: This means to request in SMS the backend system to return the location information in English.
For example: The extended byte 0x00 0x00 or 0x00 0x01 means to request for Chinese location information; while the extended byte 0x00 0x02 means to request for English location information.
i. Status and course details
This occupies 2 bytes to indicate the moving direction of the terminal. The value range is 0–360°. It regards due north as 0° and counts clockwise.
BYTE_1
Bit7
0
Bit6
0
Bit5
GPS Real-time/Differential Positioning
Bit4
Positioned or Not
Bit3
East/West longitude
Bit2
South/North latitude
Bit1
Course
Bit0
BYTE_2
Bit7
Bit6
Bit5
Bit4
Bit3
Bit0
Bit1
Bit2
Return packet (from server)
No return packet is required.
GPS Location Packet over 4G (0xa0) (V1.0)
Description:
The location packet carries the location data of the terminal.
After the GPS module is positioned and the connection is established, the terminal will upload data about fixes by preset rules.
After the connection is established and there are cache fixes, the terminal will upload these cache fixes.
Location packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA0 (UTC)
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Number of Satellites
1
The first character refers to GPS Information Length; while the second character refers to Number of Satellites that involve in positioning (which
must convert to decimal).
Latitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Longitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Speed
1
It is a value in decimal.
Course and Status
2
Convert to a 16-bit binary. Please calculate by bit (see Attachment 3).
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (see the following note for length details)
LAC
4
Location Area Code (convert to decimal)
Cell ID
8
Cell Tower ID (convert to decimal)
ACC
1
It refers to the ACC status, where "00" means ACC off and "01" ACC on (unavailable on GT06)
Data upload mode
1
GPS data point upload type (unavailable on GT06) 0x00: Upload in fixed interval
0x01: Upload at fixed distance
0x02: Upload at cornering point
0x03: Upload upon ACC status change
0x04: Upload the last fix after the status changes from moving to still
0x05: Upload the last valid fix prior to reconnection from a network interruption
0x06: Force to upload a GPS fix upon ephemeris refresh 0x07: Upload a fix upon key press
0x08: Upload location information upon power-on 0x09: Not used
0x0A: Upload the last longitude and latitude and update the time after the device goes still
0x0B: Parse the uploaded longitude and latitude packet over WiFi 0x0C: Upload upon LJDW (immediate position) command
0x0D: Upload the last longitude and latitude after the device goes still
0x0E: GPSDUP upload (upload at a fixed interval in still state)
GPS data re- upload
1
0x00: Real-time upload; 0x01: Re-upload (unavailable on GT06)
Mileage statistics
4
Convert to decimal to get the result (for products without this feature, there is no such place in the packet)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 29 A0 15 08 11 01 0B 31 C5 02 6C 1E 04 0C 39 2E C0 0D 14 94 01
CC 00 00 00 28 66 00 00 00 00 0D 67 F6 42 00 00 00 02 C4 62 8D 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Status and course details
This occupies 2 bytes to indicate the moving direction of the terminal. The value range is 0–360°. It regards due north as 0° and counts clockwise.
BYTE_1
Bit7
0
Bit6
0
Bit5
GPS Real- time/Differential Positioning
Bit4
Positioned or Not
Bit3
East/West longitude
Bit2
South/North latitude
Bit1
Course
Bit0
BYTE_2
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Return packet (from server) No return packet is required.
LBS Multi-base Extended Information Packet over 2G (0x28) (V1.0)
Description:
It is used to transmit location information when the terminal doesn't locate.
a) LBS extended information packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x18 If the protocol number is "0x2E", then it is a location packet that requires a response; if the server doesn't respond, then a backup action will be performed.
Information Content
UTC
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (convert to decimal)
LAC
2
Location Area Code (convert to decimal)
CI
3
Cell Tower ID (convert to decimal)
RSSI
1
It indicates the signal strength of a cell. Its value range is 0x00–0xFF,
where "0x00" indicates the signal is the weakest; while "0xFF" the strongest.
NLAC1
2
Same as LAC
NCI1
3
Same as CI
NRSSI1
1
Same as RSSI
NLAC2
2
Same as LAC
NCI2
3
Same as CI
NRSSI2
1
Same as RSSI
NLAC3
2
Same as LAC
NCI3
3
Same as CI
NRSSI3
1
Same as RSSI
NLAC4
2
Same as LAC
NCI4
3
Same as CI
NRSSI4
1
Same as RSSI
NLAC5
2
Same as LAC
NCI5
3
Same as CI
NRSSI5
1
Same as RSSI
NLAC6
2
Same as LAC
NCI6
3
Same as CI
NRSSI6
1
Same as RSSI
Timing Advance
1
It refers to the difference between the actual length of time that a signal takes to reach the base station from a mobile station and the length of
time that a signal takes to reach the base station from a mobile station when the distance between the two is "0".
Language
2
0x00 0x01: Chinese; 0x00 0x02: English
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 3B 28 10 01 0D 02 02 02 01 CC 00 28 7D 00 1F 71 3E 28 7D 00 1F
72 31 28 7D 00 1E 23 2D 28 7D 00 1F 40 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 FF 00 02 00 05 B1 4B 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
<spanb)serverlbs< span="">Return packet</spanb)serverlbs<>
For vehicle and OBD trackers, no return packet is required from the server to the LBS multi-base extended information packet.
For 0x28, no return packet is required from the server. For 0x2E, a return packet is required from the server.
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
A location packet whose protocol number is "0x2E" requires a response from the server. If the server doesn't respond, a backup action will be performed.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
LBS Multi-base Extended Information Packet over 4G (0xa1) (V1.0)
Description:
It is used to transmit location information when the terminal doesn't locate.
LBS extended information packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA1
Information Content
UTC
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (see the following note for length detail)
LAC
4
Location Area Code (convert to decimal)
CI
8
Cell Tower ID (convert to decimal)
RSSI
1
It indicates the signal strength of a cell. Its value range is 0x00–0xFF, where "0x00" indicates the signal is the weakest; while "0xFF" the strongest.
NLAC1
4
Same as LAC
NCI1
8
Same as CI
NRSSI1
1
Same as RSSI
NLAC2
4
Same as LAC
NCI2
8
Same as CI
NRSSI2
1
Same as RSSI
NLAC3
4
Same as LAC
NCI3
8
Same as CI
NRSSI3
1
Same as RSSI
NLAC4
4
Same as LAC
NCI4
8
Same as CI
NRSSI4
1
Same as RSSI
NLAC5
4
Same as LAC
NCI5
8
Same as CI
NRSSI5
1
Same as RSSI
NLAC6
4
Same as LAC
NCI6
8
Same as CI
NRSSI6
1
Same as RSSI
Timing Advance
1
It refers to the difference between the actual length of time that a signal takes to reach the base station from a mobile station and the length of time that a signal takes to reach the base station from a mobile station
when the distance between the two is "0".
Language
2
0x00 0x01: Chinese; 0x00 0x02: English
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data:78 78 6C A1 15 08 11 01 22 2D 01 CC 00 00 00 24 7F 00 00 00 00 03 3B 36
8D 38 00 00 24 7F 00 00 00 00 03 3B 36 8C 1F 00 00 24 7F 00 00 00 00 0A 80 8A 0C 22
00 00 24 7F 00 00 00 00 0A 80 8A 0D 22 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF 00 02 02 D5 21 D7 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Return packet (from server)
No return packet is required from the server.
WIFI Information Packet over 2G (0x2c) (V1.0)
Description:
It is used to transmit the packet received by the terminal from the WiFi network.
WiFi packet sent by terminal
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x2C
Information Content
UTC
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
MCC
2
It is the abbreviation of Mobile Country Code, which indicates the country to which a mobile subscriber belongs. The MSB in MCC is 1 and the MNC occupies 2 bytes.
MNC
1 (or 2)
It is the abbreviation of Location Area Code.
LAC
2
It is the abbreviation of Location Area Code.
CI
3
It is the abbreviation of Cell Tower ID.
RSSI
1
It indicates the signal strength of a cell. Its value range is 0x00–0xFF,
where "0x00" indicates the signal is the weakest; while "0xFF" the strongest.
NLAC1
2
Same as LAC
NCI1
3
Same as CI
NRSSI1
1
Same as RSSI
NLAC2
2
Same as LAC
NCI2
3
Same as CI
NRSSI2
1
Same as RSSI
NLAC3
2
Same as LAC
NCI3
3
Same as CI
NRSSI3
1
Same as RSSI
NLAC4
2
Same as LAC
NCI4
3
Same as CI
NRSSI4
1
Same as RSSI
NLAC5
2
Same as LAC
NCI5
3
Same as CI
NRSSI5
1
Same as RSSI
NLAC6
2
Same as LAC
NCI6
3
Same as CI
NRSSI6
1
Same as RSSI
Timing Advance
1
It refers to the difference between the actual length of time that a signal takes to reach the base station from a mobile station and the
length of time that a signal takes to reach the base station from a mobile station when the distance between the two is "0".
Number of WiFi Networks
1
It is used to determine the number of WiFi networks carried in the packet. "0" means no WiFi is detected.
WIFI MAC1
6
It is the MAC address of WiFi1 received (transmitted based on the actual number of WiFi networks searched, that is, if one or multiple WiFi networks are searched, then one/multiple MAC addresses will
be transmitted. If none is searched, then none will be transmitted.)
WIFI1 Strength
1
It indicates the strength of WiFi1.
WIFI MAC2
6
As above
WIFI2 Strength
1
As above
/
/
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 48 2C 10 06 0E 02 2D 35 01 CC 00 28 7D 00 1F 71 2D 28 7D 00 1E
17 25 28 7D 00 1E 23 1E 28 7D 00 1F 72 1C 28 7D 00 1F 40 12 00 00 00 00 00 00 00 00
00 00 00 00 FF 02 80 89 17 44 98 B4 5C CC 7B 35 36 61 A6 5B 00 1F A0 04 0D 0A
Response by server to WiFi packet No reply is required from the server.
WiFi Information Packet over 4G (0xa2) (V1.0)
Description:
It is used to transmit the packet received by the terminal from the WiFi network.
WiFi packet sent by terminal
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA2
Information Content
UTC
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
MCC
2
It is the abbreviation of Mobile Country Code, which indicates the country to which a mobile subscriber belongs.
MNC
1 (or 2)
Mobile Network Code (see the following note for length detail)
LAC
4
It is the abbreviation of Location Area Code.
CI
8
It is the abbreviation of Cell Tower ID.
RSSI
1
It indicates the signal strength of a cell. Its value range is 0x00–0xFF, where "0x00" indicates the signal is the weakest; while "0xFF" the strongest.
NLAC1
4
Same as LAC
NCI1
8
Same as CI
NRSSI1
1
Same as RSSI
NLAC2
4
Same as LAC
NCI2
8
Same as CI
NRSSI2
1
Same as RSSI
NLAC3
4
Same as LAC
NCI3
8
Same as CI
NRSSI3
1
Same as RSSI
NLAC4
4
Same as LAC
NCI4
8
Same as CI
NRSSI4
1
Same as RSSI
NLAC5
4
Same as LAC
NCI5
8
Same as CI
NRSSI5
1
Same as RSSI
NLAC6
4
Same as LAC
NCI6
8
Same as CI
NRSSI6
1
Same as RSSI
Timing Advance
1
It refers to the difference between the actual length of time that a signal takes to reach the base station from a mobile station and the length of time that a signal takes to reach the base station from a mobile station when the distance between the two is "0".
Number of WiFi Networks
1
It is used to determine the number of WiFi networks carried in the packet. "0" means no WiFi is detected.
WIFI MAC1
6
It is the MAC address of WiFi1 received (transmitted based on the actual number of WiFi networks searched, that is, if one or multiple WiFi networks are searched, then one/multiple MAC addresses will be transmitted. If none is searched, then none will be transmitted.)
WIFI1 Strength
1
It indicates the strength of WiFi1.
WIFI MAC2
6
As above
WIFI2 Strength
1
As above
/
/
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 95 A2 15 08 11 01 25 08 01 CC 00 00 00 24 7F 00 00 00 00 03 3B 36
8D 36 00 00 24 7F 00 00 00 00 0A 80 8A 0D 27 00 00 24 7F 00 00 00 00 03 3B 36 8C 20
00 00 24 7F 00 00 00 00 0A 80 8A 0C 23 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF 06 78 57 73 3F
F1 60 31 00 5A 13 64 C1 F0 32 78 57 73 3F F1 61 3D 78 57 73 3F F1 62 3E 78 57 73 3F
F1 63 3E 78 57 73 3F F0 41 50 02 D6 52 71 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Response by server to WiFi packet No reply is required from the server.
2G Alarm Packet (0x27) (V1.0)
Description:
It is used to transmit the terminal-defined alarm content.
The server responds to the alarm content received and sends the address parsed from the longitude and latitude to the terminal.
Then the terminal sends the address received to the preset SOS number.
a) Alarm packet (multiple geofences)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x27 (UTC)
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Number of Satellites
1
The first character refers to GPS Information Length; while the second character refers to Number of Satellites that involve in positioning (which must convert to decimal).
Latitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Longitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Speed
1
It is a value in decimal.
Course and Status
2
Convert to a 16-bit binary. Please calculate by bit (see GPS location packet for details).
LBS length
1
Total length of LBS information (Self-length + MCC + MNC + LAC + CellID)
MCC
2
Mobile Country Code (convert to decimal)
The MSB in MCC is 1 and the MNC occupies 2 bytes.
MNC
1 (or 2)
Mobile Network Code (convert to decimal)
LAC
2
Location Area Code (convert to decimal)
Cell ID
3
Cell Tower ID (convert to decimal)
Terminal information
1
See the following table for details.
Voltage Level
1
0X00: No power (power off)
0x01: Battery extremely low (making calls or sending SMS's are impossible) 0x02: Battery very low (low battery alert will be triggered)
0x03: Battery low (the device can be used as usual) 0x04: Battery medium
0x05: Battery high
0x06: Battery extremely high
GSM signal strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Alert and language
2
See the following table for details.
Fence No.
1
This byte is valid for geofence alerts. 0: Fence No. 1; 1: Fence No. 2; …; FF: Invalid
Mileage statistics
(vehicle trackers)
4
Convert to decimal to get the result (for products without this feature, there is no such place in the packet)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 26 27 10 04 19 09 2D 07 C5 02 7A C9 1C 0C 46 58 00 00 05 37 09
00 00 00 00 00 00 00 00 80 02 00 0C 01 FF 00 00 4D F6 0D 0A
Terminal information details
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit3–Bit5
100: SOS
011: Low battery alert
010: Power cutoff
001: Vibrating alert
000: Normal
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Alarm and Language Details
Byte 1
0x00: Normal
0x01: SOS alert
0x02: Power cut alert
0x03: Vibrating alert
0x04: Entered fence alert
0x05: Left fence alert
0x06: Speed alert
0x09: Tow/theft alert
0x0A: Entered GPS blind spot alert
0x0B: Left GPS blind spot alert
0x0C: Powered on alert
0x0D: GPS first fix alert
0x10: SIM changed alert
0x11: Powered off alert
0x13: Tamper alert
0x15: Powered off due to low battery
0x16: Sound-control alert
0x17: Rogue base station detected alert
0x18: Cover removed alert
0x19: Low internal battery alert
0x21: Reserved
0x22: Reserved
0x3E: Key press event report
0xFF: ACC OFF
0xFE: ACC ON
Byte 2
0x01: Chinese 0x02: English
0x00: No reply from the platform is required
Note: As alerts accumulate, the alerts and alarm bytes in the terminal information may overlap, in which case the alarm byte will be regarded as the baseline. That means when the alarm byte is "0x00", the alarm content in the terminal information can be determined.
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x26 (UTC)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 27 00 1C C7 5A 0D 0A
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 9F 17 99 00 00 00 01 41 4C 41 52 4D 53 4D 53 26 26 97 07 52 A8 62
A5 8B 66 00 3A 00 47 00 54 00 30 00 36 00 44 00 2D 00 31 00 32 00 38 00 33 00 36 00
2D 00 5A 00 4A 00 4D 00 2C 5E 7F 4E 1C 77 01 00 2E 60 E0 5D DE 5E 02 00 2E 60 E0
57 CE 53 3A 00 2E 4E 91 5C 71 89 7F 8D EF 00 2E 79 BB 60 E0 5D DE 5E 02 5B 66 59
27 65 59 80 B2 7E A6 00 32 00 37 7C 73 00 2E 00 2C 00 31 00 30 00 3A 00 34 00 33 26
26 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 1C EA 97 0D
0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x97
Information Content
Length
2
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BC 97 00 B5 00 00 00 01 41 4C 41 52 4D 53 4D 53 26 26 00 4A
00 4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53 00 4F 00 53 00 20 00
61 00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00 70 00 3A 00 2F 00 2F 00 6D 00
61 00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67 00 6C 00 65 00 2E 00 63 00 6F 00 6D 00
2F 00 6D 00 61 00 70 00 73 00 3F 00 71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00
33 00 35 00 36 00 2C 00 45 00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 69 15 9B 0D 0A
4G Alarm Packet (0xa4) (V1.0)
Description:
It is used to transmit the terminal-defined alarm content.
The server responds to the alarm content received and sends the address parsed from the longitude and latitude to the terminal.
Then the terminal sends the address received to the preset SOS number.
a) Alarm packet (multiple geofences)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA4 (UTC)
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Number of Satellites
1
The first character refers to GPS Information Length; while the second character refers to Number of Satellites that involve in positioning (which must convert to decimal).
Latitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Longitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Speed
1
It is a value in decimal.
Course and Status
2
Convert to a 16-bit binary. Please calculate by bit (see GPS location packet for details).
LBS length
1
Total length of LBS information (Self-length + MCC + MNC + Cell ID)
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (see the following note for length details)
LAC
4
Location Area Code (convert to decimal)
Cell ID
8
Cell Tower ID (convert to decimal)
Terminal information
1
See the following table for details.
Voltage Level
1
0x00: No power (power off)
0x01: Battery extremely low (making calls or sending SMS's are impossible) 0x02: Battery very low (low battery alert will be triggered)
0x03: Battery low (the device can be used as usual) 0x04: Battery medium
0x05: Battery high
0x06: Battery extremely high
GSM signal strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Alert and language
2
See the following table for details.
Fence No.
1
This byte is valid for geofence alerts. 1: Fence No. 2; 1: Fence No. 2; …; FF: Invalid
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and
discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data:78 78 2D A4 15 08 17 07 3B 10 CF 03 2E EA 9C 0B 6C E0 80 00 15 14 10
01 CC 01 00 00 9A 00 00 00 00 00 0A 6F 24 01 46 05 04 13 02 FF 01 90 8A 64 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Terminal information details
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit3–Bit5
100: SOS
011: Low battery alert
010: Power cutoff
001: Vibrating alert
000: Normal
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Alarm and language details
Byte 1
0x00: Normal
0x01: SOS alert
0x02: Power cut alert
0x03: Vibrating alert
0x04: Entered fence alert
0x05: Left fence alert
0x06: Speed alert
0x09: Tow/theft alert
0x0A: Entered GPS blind spot alert
0x0B: Left GPS blind spot alert
0x0C: Powered on alert
0x0D: GPS first fix alert
0x10: SIM changed alert
0x11: Powered off alert
0x13: Tamper alert
0x15: Powered off due to low battery
0x16: Sound-control alert
0x17: Rogue base station detected alert
0x18: Cover removed alert
0x19: Low internal battery alert
0x20: Entered deep sleep mode alert
0x21: Reserved
0x22: Reserved
0xFF: ACC OFF
0xFE: ACC ON
Byte 2
0x01: Chinese 0x02: English
0x00: No reply from the platform is required
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x26 (UTC)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
2
0x97
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
GPS Address Request Packet (0x2a) (V1.0)
Description:
The user sends an address request command to the terminal, which sends an address request packet to the server to request for address parsing.
Then the terminal sends the address parsed and returned by the server to the user.
Address request packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x2A
Information Content
Date and time
6
Year (1 byte) Month (1 byte) Day (1 byte) Hour (1 byte) Minute (1 byte) Second (1 byte) (which must convert to decimal)
Number of Satellites
1
The first character refers to GPS Information Length; while the second character refers to Number of Satellites that involve in positioning (which
must convert to decimal).
Latitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Longitude
4
It is a value calculated by converting to decimal which is further divided by 1,800,000.
Speed
1
It is a value in decimal.
Course and Status
2
Convert to a 16-bit binary. Please calculate by bit (see GPS location packet for details).
Phone number
21
Phone number
Alert and language
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 2E 2A 0F 0C 1D 07 11 39 CA 02 7A C8 00 0C 46 58 00 00 14 D8 31
32 35 32 30 31 33 35 33 32 31 37 37 30 37 39 00 00 00 00 00 00 01 00 2A 6E CE 0D 0A
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 6E 17 68 00 00 00 01 41 44 44 52 45 53 53 26 26 4F 4D 7F 6E 00
3A 5E 7F 4E 1C 77 01 00 2E 60 E0 5D DE 5E 02 00 2E 60 E0 57 CE 53 3A 00 2E 4E 91
5C 71 89 7F 8D EF 00 2E 79 BB 60 E0 5D DE 5E 02 5B 66 59 27 65 59 80 B2 7E A6 00
32 00 35 7C 73 00 2E 26 26 38 36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00
00 23 23 00 16 C1 EC 0D 0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x97
Information Content
Length
2
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BB 97 00 B5 00 00 00 01 41 44 44 52 45 53 53 26 26 00 4A 00
4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53 00 4F 00 53 00 20 00 61
00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00 70 00 3A 00 2F 00 2F 00 6D 00 61
00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67 00 6C 00 65 00 2E 00 63 00 6F 00 6D 00 2F
00 6D 00 61 00 70 00 73 00 3F 00 71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00 33
00 35 00 36 00 2C 00 45 00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26 38
36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00 00 23 23 00 16 8E A5 0D 0A
LBS Address Request Packet over 2G (0x17) (V1.0)
Description:
The user sends an address request command to the terminal, which sends an address request packet to the server to request for address parsing.
Then the terminal sends the address parsed and returned by the server to the user.
Address request packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (convert to decimal)
LAC
2
Location Area Code (convert to decimal)
Cell ID
3
Cell Tower ID (convert to decimal)
Phone number
21
Phone number
Alert and language
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 24 17 01 CC 00 28 7D 00 1F 71 31 32 35 32 30 31 33 35 33 32 31
37 37 30 37 39 00 00 00 00 00 00 01 00 2A 7D D6 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the
receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 6E 17 68 00 00 00 01 41 44 44 52 45 53 53 26 26 4F 4D 7F 6E 00
3A 5E 7F 4E 1C 77 01 00 2E 60 E0 5D DE 5E 02 00 2E 60 E0 57 CE 53 3A 00 2E 4E 91
5C 71 89 7F 8D EF 00 2E 79 BB 60 E0 5D DE 5E 02 5B 66 59 27 65 59 80 B2 7E A6 00
32 00 35 7C 73 00 2E 26 26 38 36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00
00 23 23 00 16 C1 EC 0D 0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x97
Information Content
Length
2
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error
and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BB 97 00 B5 00 00 00 01 41 44 44 52 45 53 53 26 26 00 4A 00
4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53 00 4F 00 53 00 20 00 61
00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00 70 00 3A 00 2F 00 2F 00 6D 00 61
00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67 00 6C 00 65 00 2E 00 63 00 6F 00 6D 00 2F
00 6D 00 61 00 70 00 73 00 3F 00 71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00 33
00 35 00 36 00 2C 00 45 00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26 38
36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00 00 23 23 00 16 8E A5 0D 0A
LBS Address Request Packet over 4G (0xa7) (V1.0)
Description:
The user sends an address request command to the terminal, which sends an address request packet to the server to request for address parsing.
Then the terminal sends the address parsed and returned by the server to the user.
Address request packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA7
Information Content
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (see the following note for length details)
LAC
4
Location Area Code (convert to decimal)
Cell ID
8
Cell Tower ID (convert to decimal)
Phone number
21
Phone number
Alert and language
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Information SN
2
The SN will be automatically added by "1” for each data sending after
power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error
and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example:
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error
and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 6E 17 68 00 00 00 01 41 44 44 52 45 53 53 26 26 4F 4D 7F 6E 00
3A 5E 7F 4E 1C 77 01 00 2E 60 E0 5D DE 5E 02 00 2E 60 E0 57 CE 53 3A 00 2E 4E 91
5C 71 89 7F 8D EF 00 2E 79 BB 60 E0 5D DE 5E 02 5B 66 59 27 65 59 80 B2 7E A6 00
32 00 35 7C 73 00 2E 26 26 38 36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00
00 23 23 00 16 C1 EC 0D 0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x97
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ADDRESS
7
Address request code flag (ASCII)
&&
2
Separator (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is the phone number used by the server to transmit back the terminal request packet (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the
receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BB 97 00 B5 00 00 00 01 41 44 44 52 45 53 53 26 26 00 4A 00
4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53 00 4F 00 53 00 20 00 61
00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00 70 00 3A 00 2F 00 2F 00 6D 00 61
00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67 00 6C 00 65 00 2E 00 63 00 6F 00 6D 00 2F
00 6D 00 61 00 70 00 73 00 3F 00 71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00 33
00 35 00 36 00 2C 00 45 00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26 38
36 31 33 34 32 31 36 33 32 36 39 39 00 00 00 00 00 00 00 00 23 23 00 16 8E A5 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
LBS Alarm Packet over 2G (0x19) (V1.0)
Description:
It is used to transmit the terminal-defined alarm content.
The server responds to the alarm content received and sends the address parsed from the LBS information to the terminal.
Then the terminal sends the address received to the preset SOS number.
Alarm packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x19
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (convert to decimal)
LAC
2
Location Area Code (convert to decimal)
Cell ID
3
Cell Tower ID (convert to decimal)
Terminal information
1
See the following table for details.
0x00: No power (power off)
0x01: Battery extremely low (making calls or sending SMS's are impossible)
0x02: Battery very low (low battery alert will be triggered)
0x03: Battery low (the device can be used as usual)
Information Content
Voltage Level
1
0x04: Battery medium
0x05: Battery high
0x06: Battery extremely high
AM01 smart ankle bracelet: It uses percentage to indicate the battery strength, wherein 0x5a refers to 90%.
GSM signal strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Alert and language
2
See the following table for details.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the
receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 12 19 01 CC 00 28 7D 00 1F 71 20 04 04 01 01 00 94 6C
89 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Terminal information details
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit3–Bit5
100: SOS
011: Low battery alert
010: Power cutoff
001: Vibrating alert
000: Normal
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Alarm and Language Details
Byte 1
0x00: Normal
0x01: SOS alert
0x02: Power cut alert
0x03: Vibrating alert
0x04: Entered fence alert
0x05: Left fence alert
0x06: Speed alert
0x09: Tow/theft alert
0x0A: Entered GPS blind spot alert
0x0B: Left GPS blind spot alert
0x0C: Powered on alert
0x0D: GPS first fix alert
0x0E: Low external power alert
0x0F: External power low voltage protection alert
0x10: SIM changed alert
0x11: Powered off alert
0x12: Airplane mode on following external power low voltage protection
0x13: Tamper alert
0x14: Door alert
0x15: Powered off due to low battery
0x16: Sound-control alert
0x17: Rogue base station detected alert
0x18: Cover removed alert
0x19: Low internal battery alert
0x1B: Suspected of leaving the herd
0x20: Entered deep sleep mode alert (airplane mode)
0x21: Reserved
0x22: Reserved
0x23: Fall alert
0x24: Charger connected alert
0x25: Light detected alert
0x26: Moving away from the Bluetooth zone alert
0x27: Wire cut alert
0x28: Solicited offline (powered off) alert
0x3E: Key press event report
Byte 2
0x01: Chinese 0x02: English
0x00: No reply from the platform is required
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x26 (UTC)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 26 00 1C 9D 86 0D 0A
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the
receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 9F 17 99 00 00 00 01 41 4C 41 52 4D 53 4D 53 26 26 97
07 52 A8 62 A5 8B 66 00 3A 00 47 00 54 00 30 00 36 00 44 00 2D 00 31 00 32
00 38 00 33 00 36 00 2D 00 5A 00 4A 00 4D 00 2C 5E 7F 4E 1C 77 01 00 2E 60
E0 5D DE 5E 02 00 2E 60 E0 57 CE 53 3A 00 2E 4E 91 5C 71 89 7F 8D EF 00
2E 79 BB 60 E0 5D DE 5E 02 5B 66 59 27 65 59 80 B2 7E A6 00 32 00 37 7C 73
00 2E 00 2C 00 31 00 30 00 3A 00 34 00 33 26 26 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 1C EA 97 0D 0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x97
Information Content
Length
2
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BC 97 00 B5 00 00 00 01 41 4C 41 52 4D 53 4D 53 26
26 00 4A 00 4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53
00 4F 00 53 00 20 00 61 00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00
70 00 3A 00 2F 00 2F 00 6D 00 61 00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67
00 6C 00 65 00 2E 00 63 00 6F 00 6D 00 2F 00 6D 00 61 00 70 00 73 00 3F 00
71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00 33 00 35 00 36 00 2C 00 45
00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 69 15 9B 0D 0A
LBS Alarm Packet over 4G (0xa5) (V1.0)
Description:
It is used to transmit the terminal-defined alarm content.
The server responds to the alarm content received and sends the address parsed from the LBS information to the terminal.
Then the terminal sends the address received to the preset SOS number.
Alarm packet (sent by terminal)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0xA5
Information Content
MCC
2
Mobile Country Code (convert to decimal)
MNC
1 (or 2)
Mobile Network Code (see the following note for length details)
LAC
4
Location Area Code (convert to decimal)
Cell ID
8
Cell Tower ID (convert to decimal)
Terminal information
1
See the following table for details.
Voltage Level
1
0x00: No power (power off)
0x01: Battery extremely low (making calls or sending SMS's are impossible) 0x02: Battery very low (low battery alert will be triggered)
0x03: Battery low (the device can be used as usual) 0x04: Battery medium
0x05: Battery high
0x06: Battery extremely high
GSM signal strength
1
0X00: No signal;
0x01: Extremely weak signal; 0x02: Weak signal;
0x03: Good signal; 0x04: Strong signal
Alert and language
2
See the following table for details.
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 19 A5 01 CC 01 00 00 9A 00 00 00 00 00 0A 6F 24 01 0E
05 04 03 00 01 88 D3 3A 0D 0A
Note: As the MNC of some countries occupies 2 bytes, we use the MSB in MCC to differentiate the length of MNC. When the MSB in MCC
is "1", the length of the MNC is "2". For shipped devices, Bit15 is "0" by default; while for newly-shipped devices, Bit15 is "1".
MCC bits
Bit
Code Connotation
BYTES
Bit15
1: The length of MNC is 2
0: The length of MNC is 1
Bit0–bit14
MCC information
Example data:
Terminal information details
Bit
Code Connotation
BYTE
Bit7
1: Cut off fuel/power
0: Restore fuel/power
Bit6
1: Position fixed
0: Not Positioned
Bit3–Bit5
100: SOS
011: Low battery alert
010: Power cutoff
001: Vibrating alert
000: Normal
Bit2
1: Charge with power connected
0: Charge with no power connected
Bit1
1: ACC on
0: ACC off
Bit0
1: Defense on
0: Defense off
Alarm and language details
Byte 1
0x00: Normal
0x01: SOS alert
0x02: Power cut alert
0x03: Vibrating alert
0x04: Entered fence alert
0x05: Left fence alert
0x06: Speed alert
0x09: Tow/theft alert
0x0A: Entered GPS blind spot alert
0x0B: Left GPS blind spot alert
0x0C: Powered on alert
0x0D: GPS first fix alert
0x10: SIM changed alert
0x11: Powered off alert
0x12: Airplane mode on following external power low voltage protection
0x13: Tamper alert
0x14: Door alert
0x15: Powered off due to low battery
0x16: Sound-control alert
0x17: Rogue base station detected alert
0x18: Cover removed alert
0x19: Low internal battery alert
0x20: Entered deep sleep mode alert
0x21: Reserved
0x22: Reserved
0xFF: ACC OFF
0xFE: ACC ON
Byte 2
0x01: Chinese 0x02: English
0x00: No reply from the platform is required
Return packet (from server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x26 (UTC)
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 05 26 00 1C 9D 86 0D 0A
Server returns the Chinese address
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x17
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 9F 17 99 00 00 00 01 41 4C 41 52 4D 53 4D 53 26 26 97
07 52 A8 62 A5 8B 66 00 3A 00 47 00 54 00 30 00 36 00 44 00 2D 00 31 00 32
00 38 00 33 00 36 00 2D 00 5A 00 4A 00 4D 00 2C 5E 7F 4E 1C 77 01 00 2E 60
E0 5D DE 5E 02 00 2E 60 E0 57 CE 53 3A 00 2E 4E 91 5C 71 89 7F 8D EF 00
2E 79 BB 60 E0 5D DE 5E 02 5B 66 59 27 65 59 80 B2 7E A6 00 32 00 37 7C 73
00 2E 00 2C 00 31 00 30 00 3A 00 34 00 33 26 26 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 1C EA 97 0D 0A
Server returns the English address
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
2
0x97
Information Content
Length
1
It is the length of the data between the server flag bit and the information SN.
Server flag bit
4
It is used by the server to mark the specific alert.
ALARMSMS
8
Alarm code flag (ASCII)
&&
2
Alarm code flag (ASCII)
Address content
M
It is the address parsed by the server (UNICODE)
&&
2
Separator (ASCII)
Phone number
21
It is "0" for all uploaded alarm packets (ASCII)
##
2
Separator (ASCII)
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 BC 97 00 B5 00 00 00 01 41 4C 41 52 4D 53 4D 53 26
26 00 4A 00 4D 00 30 00 31 00 2D 00 38 00 39 00 37 00 33 00 31 00 3A 00 53
00 4F 00 53 00 20 00 61 00 6C 00 61 00 72 00 6D 00 2E 00 68 00 74 00 74 00
70 00 3A 00 2F 00 2F 00 6D 00 61 00 70 00 73 00 2E 00 67 00 6F 00 6F 00 67
00 6C 00 65 00 2E 00 63 00 6F 00 6D 00 2F 00 6D 00 61 00 70 00 73 00 3F 00
71 00 3D 00 4E 00 32 00 32 00 2E 00 35 00 37 00 33 00 35 00 36 00 2C 00 45
00 31 00 31 00 33 00 2E 00 39 00 32 00 31 00 37 00 31 26 26 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 23 00 69 15 9B 0D 0A
Online Command (0x80) (V1.0)
Description:
It is assigned by the server and used to control the terminal to execute tasks.
The terminal then responds to the server with the execution results.
Online command (sent by server)
Length
Details
Start Bit
2
0x78 0x78
Packet Length
1
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x80
Information Content
Length
1
Server flag bit + command content length
Server Flag Bit
4
It is reserved for server recognition. The terminal returns to the server the data it receives as it is in binary in a return packet.
Command Content
M
It is a character string in ASCII. It is compatible with SMS command.
Language
2
Latter bit, where "0x01" refers to Chinese and "0x02" English.
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 Fragments of CRC Lookup Table in C for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 78 78 0E 80 08 00 00 00 00 73 6F 73 23 00 01 6D 6A 0D 0A
The terminal responds to the online command (0x21) Return packet sent by the terminal (universal command)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x21
Information Content
Server Flag Bit
4
It is reserved for server recognition. The terminal returns to the server the data it receives as it is in binary in a return packet.
Code
1
0x01: ASCII code 0x02: UTF16-BE code
Content
M
It refers to the data to be sent (by the coding format).
Information SN
2
The SN will be automatically added by "1” for each data sending after power- on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 9D 21 00 00 00 00 01 42 61 74 74 65 72 79 3A 34 2E 31 36 56
2C 4E 4F 52 4D 41 4C 3B 20 47 50 52 53 3A 4C 69 6E 6B 20 55 70 3B 20 47 53 4D 20 53
69 67 6E 61 6C 20 4C 65 76 65 6C 3A 53 74 72 6F 6E 67 3B 20 47 50 53 3A 53 65 61 72
63 68 69 6E 67 20 73 61 74 65 6C 6C 69 74 65 2C 20 53 56 53 20 55 73 65 64 20 69 6E
20 66 69 78 3A 30 28 30 29 2C 20 47 50 53 20 53 69 67 6E 61 6C 20 4C 65 76 65 6C 3A
3B 20 41 43 43 3A 4F 46 46 3B 20 44 65 66 65 6E 73 65 3A 4F 46 46 00 2E 26 DF 0D 0A
General Information Transmission Packet (0x94) (V1.0)
Description:
It is used to transmit all kinds of non-location data.
Information transmission packet (sent by terminal)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x94
(Container trackers) 00: Voltage of external power (domestic yak trackers) 00: Voltage of external power
(container trackers) 01-03 (customized) (domestic yak trackers) 01-
03 (customized)
(container trackers) 04: Terminal status synchronization (domestic yak trackers) 04: Terminal status synchronization
(container trackers) 05: Door status (domestic yak trackers) 05:
Door status
(Container trackers) 08: Self-check parameters (domestic yak trackers) 08: Self-check parameters
(Container trackers) 0x09: Satellite status (domestic yak trackers)
0x09: Satellite status
(Vehicle and OBD trackers) 09: Location satellite information
(Container and OBD trackers) 0x0A: ICCID (domestic yak trackers)
0x0A: ICCID
Information Content
Information type (sub-protocol No.)
1
0x0C: Data uploaded by the fuel level sensor and other sensors
0x0D: Data uploaded by the sensor of DS1309
(Vehicle trackers) 0x1B: Cost counter
(Container trackers)0x11: Vibrating count (customized) (domestic yak trackers) 0x11: Vibrating count (customized)
0x15: MAC addresses of similar neighbor Bluetooth devices (JM66)
0x16: Activity data (JM66 and JM69)
0x17: Environment information (JM66)
0x20: Upload VIN
0x22: Device status information (container trackers)
Vehicle trackers: 1B RFID
0x24: Transparent transmission of steps, temperature, battery, and solar energy over Bluetooth (GEN2 domestic yak trackers)
0x25: Administrator list update flag (timestamp) 0x26: Safety zone update flag (timestamp)
0x27: Transparent transmission of solar charging information (GEN2 domestic yak trackers)
0x28: GSM timestamp + over-Bluetooth data transparent transmission (GEN2 domestic yak trackers)
0x29: Upload instant activity data (GEN2 domestic yak tracker)
0x30: Bluetooth pair code (content format: ASCII)
0x1C: GT800 long-term logistics radar information 0x1D: Soft external power voltage
0x1E: Collect temperature and humidity data (GT420D)
0x1F: Temperature sensing (data content: temperature in 2 bytes [Big Endian])
…… To be added
Data content
N
Different content will be transmitted according to different information types. For details, see the table below.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Example data: 79 79 00 7F 94 04 41 4C 4D 31 3D 43 34 3B 41 4C 4D 32 3D 43 43 3B 41
4C 4D 33 3D 34 43 3B 53 54 41 31 3D 43 30 3B 44 59 44 3D 30 31 3B 53 4F 53 3D 2C 2C
3B 43 45 4E 54 45 52 3D 3B 46 45 4E 43 45 3D 46 65 6E 63 65 2C 4F 4E 2C 30 2C 32 33
2E 31 31 31 38 30 39 2C 31 31 34 2E 34 30 39 32 36 34 2C 34 30 30 2C 49 4E 20 6F 72
20 4F 55 54 2C 30 3B 4D 49 46 49 3D 4D 49 46 49 2C 4F 46 46 00 0A 06 1E 0D 0A
Transferred information content
(Container, vehicle, and OBD trackers) When the information type is "00", it carries the voltage of the external power, which is a 2-digit hex. The hex is then converted into a decimal and further divided by 100. Take "0x04,0x9F" for example, "049F" is
1183 in decimal and is 11.83 after being divided by 100, which means the voltage of the external power is 11.83V.
Definition
ID
Byte (2)
Voltage
Byte (1)
ID (optional)
(Container, vehicle, and OBD trackers) When the information type is "04", it carries the terminal status synchronization information and is of variable-length in ASCII coding.
([Vehicle trackers feature no such parsing method] Parsing method: Extract the information content from the packet, convert the ASCII code into characters, and then parse identifiers (IDs) one by one according to definitions of these IDs.)
Content IDs
Definition
ID
Alarm byte 1
ALM1
Alarm byte 2
ALM2
Alarm byte 3
ALM3
Alarm byte 4
ALM4
Status byte 1
STA1
SOS number
SOS
Center number
CENTER
Geofence
FENCE
Fuel/power cutoff status
DYD
Mode
MODE
IMSI (vehicle and OBD
trackers have no such parameter)
IMSI
ICCID (vehicle and
OBD trackers have no such parameter)
ICCID
From power-on to login success (vehicle and OBD trackers have no
such parameter)
STARTTIME
Login packet count (vehicle and OBD trackers have no such
parameter)
LOGINPACKET
Restart retries (vehicle and OBD trackers have no such parameter)
RESTART
² ALM1 (status)
Bit
Definition
Remarks
bit7
Vibrating alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Tow/theft alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM2 (status)
Bit
Definition
Remarks
bit7
Low internal battery alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Low external power alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
Speed Alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Power Cut Alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
SOS alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Voice control alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
Defense status
1: Defense on; 0: Defense off
bit6
Auto defense
1: ON; 0: OFF
bit5
Manual defense
1: ON; 0: OFF
bit4
Remote cancellation of defense
1: ON; 0: OFF
bit3
Remote vehicle lock
1: ON; 0: OFF
bit2
To be defined
bit1
Tamper switch
1: Close; 0: Open
1: No light; 0: With light
bit0
Tamper alert
1: ON; 0: OFF
Fuel/power cutoff status
Bit
Definition
Remarks
bit7
Undefined
bit6
Undefined
bit5
Undefined
bit4
Undefined
bit3
Delay execution
because the speed is too high
1: Valid; 0: Invalid
bit2
Delay execution because the terminal is not positioned
1: Valid; 0: Invalid
bit1
Cut off fuel/power (or GT520 is not started)
1: Valid; 0: Invalid
bit0
Connect fuel/power (or GT520 is started)
1: Valid; 0: Invalid
² SOS: It transmits in ASCII coding (multiple SOS numbers are separated by commas [,]).
² Center number: It transmits in ASCII coding.
² Geo-fence: It transmits in ASCII coding.
² Mode: It transmits in ASCII coding (parameters are separated by commas [,]).
(Pet trackers) When the information type is "04", it carries the terminal status synchronization information and is of variable-length in ASCII coding.
(Parsing method: Extract the information content from the packet, convert the ASCII code into characters, and then parse IDs one by one according to definitions of these IDs.)
Content IDs
Definition
ID
Alarm byte 1
ALM1
Alarm byte 2
ALM2
Alarm byte 3
ALM3
Alarm byte 4
ALM4
Status byte 1
STA1
SOS number
SOS
Center number
CENTER
Geofence
FENCE
Fuel/power cutoff status
DYD
Mode
MODE
IMSI
IMSI
ICCID
ICCID
From start to login success
STARTTIME
Login packet count
LOGINPACKET
Restart retries
RESTART
² ALM1 (status)
Bit
Definition
Remarks
bit7
Vibrating alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
1: ON; 0: OFF
1: ON; 0: OFF
1: ON; 0: OFF
1: ON; 0: OFF
1: ON; 0: OFF
Alert via SMS
bit0
Alert via call
bit1
Alert via GPRS
bit2
Tow/theft alert
bit3
Alert via SMS
bit4
² ALM2 (status)
Bit
Definition
Remarks
bit7
Low internal battery alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Low external battery alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
Speed Alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Power Cut Alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
SOS alert
1: ON; 0: OFF
bit6
Alert via GPRS
1: ON; 0: OFF
bit5
Alert via call
1: ON; 0: OFF
bit4
Alert via SMS
1: ON; 0: OFF
bit3
Voice control alert
1: ON; 0: OFF
bit2
Alert via GPRS
1: ON; 0: OFF
bit1
Alert via call
1: ON; 0: OFF
bit0
Alert via SMS
1: ON; 0: OFF
² ALM3 (status)
Bit
Definition
Remarks
bit7
Defense status
1: Defense on; 0: Defense off
Auto defense Manual defense
Remote cancellation of defense
To be defined To be defined Tamper switch
Tamper alert
1: ON; 0: OFF
1: ON; 0: OFF
1: ON; 0: OFF
1: Close; 0: Open
1: ON; 0: OFF
bit0
bit1
bit2
bit3
bit4
bit5
bit6
Fuel/power cutoff status
Bit bit7 bit6 bit5
bit4
Definition Undefined Undefined Undefined Undefined
Delay execution
Remarks
bit3 because the speed 1: Valid; 0: Invalid is too high
Delay execution
bit2 because the terminal 1: Valid; 0: Invalid is not positioned
bit1 bit0
Cut fuel/power
1: Valid; 0: Invalid
Connect fuel/power 1: Valid; 0: Invalid
² SOS: It transmits in ASCII coding (multiple SOS numbers are separated by commas [,]).
² Center number: It transmits in ASCII coding.
² Geo-fence: It transmits in ASCII coding.
² Mode: It transmits in ASCII coding (parameters are separated by commas [,]).
JM69 pet tracker:
MODE=PWRSAVE (transit mode) MODE=TRACKING (tracking mode) MODE=WIFI (WIFI scan mode) MODE=BT (Bluetooth mode)
For example: ALM1=FF;ALM2=FF;ALM3=FF;STA1=CO;DYD=01;SOS=12345,2345,5678;CE
NTER=987654; FENCE=FENCE,ON,0,-22.277120,-113.516763,5,IN,1; MODE=TRACKING;
Note: Not all of the content will be transmitted. The platform can parse according to bits. The content uploaded varies with products.
(Container, vehicle, and OBD trackers) When the information type is "05", it carries the detection (door detection) status of the external I/O in hex.
Bit
Definition
Remarks
Bit15
TBD
Bit14
TBD
Bit13
TBD
Bit12
TBD
Bit11
TBD
Bit10
Input2 status;
Bit9
TBD
Bit8
TBD
bit7
TBD
bit6
TBD
bit5
TBD
bit4
TBD
bit3
TBD
bit2
I/O port status
1: High; 0: Low
bit1
Trigger status
1: Level high; 0: Level low
bit0
Door status
1: ON; 0: OFF
(Container trackers) When the information type is "06", it carries the terminal self- check parameters and is of variable-length in ASCII coding.
(Container, vehicle, and OBD trackers) When the information type is "09", it carries the terminal's satellite status in hex.
GPS module status
1
0x00: No such feature; 0x01: Satellite searching; 0x02: 2D positioning; 0x03: 3D positioning; 0x04: Sleeping
Number of satellites engaged in position fix
1
Based on this the number of transmission strength is determined.
GPS1 strength
1
Strength of GPS location satellite 1
GPS2 strength
1
Strength of GPS location satellite 2
……
Number of GPS satellites that are visible but not engaged in position fix
1
Based on this the number of transmission strength is determined.
Visible GPS1 Strength
1
Strength of visible satellite 1
Visible GPS2 strength
1
Strength of visible satellite 2
……
BDS module status
1
0x00: No such feature; 0x01: Satellite searching; 0x02: 2D positioning; 0x03: 3D positioning; 0x04: Sleeping
Number of BDS satellites engaged in position fix
1
This is the basis for determining the volume of satellite signal strength.
BDS1 strength
1
Strength of BDS location satellite 1
BDS2 strength
1
Strength of BDS location satellite 2
……
Number of BDS satellites that are visible but not engaged in position fix
1
This is the basis for determining the volume of satellite signal strength.
Visible BDS1 strength
1
Strength of visible satellite 1
Visible BDS2 strength
1
Strength of visible satellite 2
……
Extended bit length
1
It is reserved for feature expansion. If no extended bit is added, then it is "0x00" (Note: For future feature expansion, you are advised to reserve the extended bit during protocol debugging).
Extended bit
N
It changes as the extended bit length changes. When the extended bit length is "0x00", the extended bit will not be transmitted.
(Container, vehicle, and OBD trackers) When the information type is "0A", it carries the ICCID in hex.
IMEI
8
For example: If IMEI is "123456789123456", then the terminal ID is "0x01 0x23 0x45 0x67 0x89 0x12 0x34 0x56".
IMSI
8
For example: If the IMSI is "123456789123456", then the terminal ID is "0x01 0x23 0x45 0x67 0x89 0x12 0x34 0x56".
ICCID
10
For example: If the ICCID is "12345123456789123456", then the terminal ID is "0x12 0x34 0x51 0x23 0x45 0x67 0x89 0x12 0x34 0x56".
When the information type is "0d", it carries the transparent value of the fuel level sensor in ASCII code.
!AIOIL
!AIOIL
Special protocol start
02
02
The address of the device
021.800
021.800
Output value of the fuel level sensor (unit: cm)
000.000
000.000
Temperature
412z
4
The protocol number of the standard ThinkSonic protocol
12
Software version
z
Hardware version
0200
02
Number of echoes
0
Software status code
0
Hardware status code
2
2
Installation status code
06
06
Excitation wave multiplier
BF
BF
Verification code
When the information type is "0E", it carries the sensor information. Data of multiple types will be combined and uploaded in (type+data)*n format. Note: The data format is determined by the type.
type=00 fuel level sensor;
type
1
00: Fuel level sensor
path
1
Address
value
2
Reading on the fuel level sensor
unit
1
1: Height; 2: Percentage; 3: Voltage value
(Vehicle trackers) When the information type is "0x10", it carries the Brazilian cost counter information in ASCII coding.
Example data: 79 79 00 4E 94 10 35 41 36 31 32 30 34 43 32 30 33 30 33 30 33 30 33 30
33 30 33 30 33 30 33 30 33 30 45 42 38 39 37 46 30 34 30 30 30 30 30 30 30 30 30 30 30
30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 35 45 00 09 46 2B
0D 0A
Transmitted information: 5A61204C20303030303030303030EB897F0400000000000000000000000000000000005 E( 35 41 36 31 32 30 34 43 32 30 33 30 33 30 33 30 33 30 33 30 33 30 33 30 33 30 33 30
45 42 38 39 37 46 30 34 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
30 30 30 30 30 30 30 30 30 30 30 30 30 35 45)
(Container trackers) When the information type is "0x11", it carries the customized vibrating counts information in a 2-digit hex.
(Domestic yak and pet trackers) When the information type is "15", it carries the MAC information of the herd in hex.
Definition
Length
Number of MAC
addresses
2
Date
6
MAC_0
(Native)
6
MAC_1
6
MAC_2
6
MAC_3
6
MAC_4
6
……
……
00 03 11 0A 1B 08 00 00 5A 8C 9F 33 45 78 E0 12 34 56 56 56 E0 12 34 55 55 55
This indicates on 2017-10-27 8:00:00 the Bluetooth MAC address of the current device is 5A 8C 9F 33 45 78. There are two yaks nearby, whose MAC addresses are E0 12 34 56 56 56 and E0 12 34 55 55 55.
(Domestic yak trackers) When the information type is "16", it carries the steps information of the yak. The data comprises of the GSM timestamp and the steps log transparently uploaded via Bluetooth (little endian).
Definition
Length
Timestamp
4
(transpare ntly transmitte d)
Timestamp
4
Steps
4
Timestamp
4
Steps
4
……
……
Max. 48H*8 = 384 bytes
(Pet trackers) When the information type is "16", it carries the activity information, which comprises of the MTK timestamp (big endian) and the steps log transparently uploaded via Bluetooth (little endian).
Definition
Length
MTK timestamp
4
(transpare ntly transmitte d)
Timestamp
4
Steps
4
Timestamp
4
Steps
4
……
……
(Pet and domestic yak trackers) When the information type is "17", it carries the current environment information. The data is uploaded via Bluetooth and transparently transmitted over GSM (little endian).
Definition
Length
Atmospheric pressure
4
Temperature
4
Humidity
4
(OBD trackers) When the information type is "20", it carries the VIN.
The data is the 17-byte VIN acquired from the CAN bus (the CAN protocol normally displays [0x25], [0x26], and [0x27] of the information).
(Container trackers) When the information type is "0x22", it carries the 2-bit device exception information.
Bit
Definition
Remarks
bit7
Pressure low
bit6
Pressure high
bit5
Temperature low
bit4
Temperature high
bit3
Left geo fence
bit2
Entered geo fence
bit1
Door opened/closed
bit0
Removed/install ed
1/0
Bit
Definition
Remarks
bit7
Reserved
bit6
Reserved
bit5
Reserved
bit4
Reserved
bit3
Reserved
bit2
Battery low
1/0
bit1
Humidity low
1/0
bit0
Humidity high
1/0
(Vehicle trackers) When the information type is "1B", it carries the RFID information in hex.
RFID
8
For example: If the RFID is "2345678912", then the terminal RFID is "0x23 0x45 0x67 0x89 0x12".
When the information type is "24", it carries the transparently-transmitted Bluetooth information (steps, temperature, battery, and solar energy).
GSM timestamp + Bluetooth data + CRC Bluetooth data:
Definition
Length
Transp arently transm itted
Timestamp
4
Steps
4
Temperature
4
Battery voltage
2
Solar voltage/current
4
Timestamp
4
……
……
When the information type is "25", it carries the administrator list update flag.
Definition
Length
Timestamp
6
When the information type is "26", it carries the safety zone update flag.
Definition
Length
Timestamp
6
When the information type is "27", it carries the solar charging information.
GSM timestamp + Bluetooth data Solar charging information
Definition
Length
Trans parent ly trans mitted
Timestamp
4
Battery voltage
2
Solar voltage/current
4
Timestamp
4
……
……
When the information type is "28", it carries the GSM timestamp + transparently- transmitted Bluetooth data.
Definition
Length
Current battery voltage
2
Current voltage of the solar panel
2
Current charging current
2
When the information type is "29", it carries the GSM timestamp + transparently- transmitted Bluetooth data.
Current instant activity data:
Definition
Length
Tran spar ently trans mitte d
Current activity data
4
When the information type is "1C", it carries long-term logistics radar information in hex.
Radar
165
15 pieces of information [55 00 3F 5F 7F 85 BF DF FF 3F BA], a total of 165 natives.
Radar information: 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 84 BF DF FF 3E BA 55 00 3F 5F 7F 80 BF DF FF 3A BA 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 85 BF DF FF
3F BA 55 00 3F 5F 7F 84 BF DF FF 3E BA 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F
5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 85 BF DF FF 3F BA 55 00 3F 5F 7F 84 BF DF FF 3E BA 55 00 3F 5F 7F 84 BF DF FF 3E BA 55 00 3F 5F 7F 84 BF DF FF 3E BA 55 00 3F 5F 7F 80 BF DF FF 3A BA
When the information type is "1D", the data contains the voltage data of the external power in N consecutive seconds.
The voltage data of one second is represented by a 2-digit hex. The hex is then converted into a decimal and further divided by 100. Take "0x04,0x9F" for example, "049F" is 1183 in decimal and is 11.83 after being divided by 100, which means the voltage of the external power is 11.83V.
EXTADC
N
UTC timestamp (4-byte)
Upload second count n (1–120) (1-byte) Voltage data (2-byte*n)
For example: Upload 3s voltage data 5C E7 30 32 03 04 9F 04 9F 04 9F Timestamp (5CE73032)
Second count (03)
Convert consecutive separate voltage data (049F 049F 049F) to decimal value and then divide the decimal value by 100, the following results are got: 11.83V, 11.83V, and 11.83V.
(GT420D) When the information type is "1E", the data contains the collected temperature and humidity data.
Definition
Length
Description (Big endian)
Expand by 10 times:
Transpa rently transmitt ed
Temperature
4
401 indicates 40.2 Celsius.
Expand by 10 times:
Content
Humidity
4
855 indicates 85.5%.
Return packet (from server)
No reply is required from the server.
Large File Transmission Packet (0x8d) (V1.0)
Description:
It is used to transmit large-size files such as audio files.
The terminal uses the 8D protocol to transmit data to the server, while the server uses the 90 protocol to deliver data to the terminal. The formats of the protocols are the same.
Due to limited space on the terminal, the server will send handshake messages to confirm the free space on the terminal before transmitting data to the terminal.
File from terminal to server (8D)
The file is sent by the terminal to the server.
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x8D
Information Content
File Type
1
0x00: Recoding file (listening)
0x01: Recording file (SOS and voice)
0x02: Recording file (two-way communication)
0x03: Recording file upon TCP command
Total file length
4
Total length of transmitted file
File error check type
1
If the file error check type is “00”, the file will be transmitted using CRC. If the file error check type is “01”, the file will be transmitted using MD5.
File error check
N
If the file error check type is “00”, the file will be transmitted using CRC and the result will be 2-bit long.
If the file error check type is “01”, the file will be transmitted using MD5 and the result will be 16-bit long.
Start position
4
Number of bytes at the start position of the transmission segmentation
Length of current content
2
Length of data after the start position of the transmission segmentation
Content
M
The data packet after segmentation
Identifier
N
The file type indicates what type is a file belongs to
. If the file type is “00 recording file (listening)”, it occupies 6 bytes. The file contains the start date and time of the listening. The coding method is the same as that of time format in the location packet.
If the file type is “01 recording file (SOS and voice)”, it occupies 2 bytes and the bytes are the same as the serial numbers of the corresponding SOS and voice control alarm packets.
If the file type is “02 recording file (two-way communication)”, it occupies 6 bytes. It contains the start date and time of the communication. The coding method is the same as that of the time format in the location packet.
If the file type is “03 recording file upon TCP command”, it will upload the unified service ID. It occupies 6 bytes, wherein the former 4 bytes are the service flag bytes and the latter 2 bytes are the transmission serial number.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Reply from the server
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x8D
Information Content
Receive status flag
1
0x00: Received; 0x01: Receive error
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 Fragments of CRC Lookup Table in C for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
File from server to terminal (GW100)
The terminal sends a request to check if there are files on the server (0x92)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x92
Information Content
System capacity
1
Total number of messages that can be held by the terminal (it is 0x05, as GW110 can hold 5 messages)
Remaining capacity
1
It indicates how many new messages can the terminal hold. For example, if there is one unread messages, then the remaining capacity is 4 messages and the value is 0x04.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 Fragments of CRC Lookup Table in C for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Server Replies or Auto Sends Message Indicating Whether There are Data (0x91)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x91
Information Content
Number of non- transmitted files
1
Number of non-transmitted files in the server
File Type
1
0x00: Recoding file (listening) (no files of this type transmitted by server)
0x01: Recording file (SOS) (no files of this type transmitted by server) 0x02: Recording file (two-way communication)
Total length of the first file
4
Information about the length of the first non-transmitted file
The error check type of the first file
1
If the file error check type is “00”, the file will be transmitted using CRC.
If the file error check type is “01”, the file will be transmitted using MD5.
(Currently, only CRC is available)
Error check of the first file
N
If the file error check type is “00”, the file will be transmitted using CRC and the result will be 2-bit long.
If the file error check type is “01”, the file will be transmitted using MD5 and the result will be 16-bit long.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Reply from Terminal on Whether to Start Download (0x91)
Lengt h
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x91
Information Content
Download or not
1
0x00: Do not download; 0x01: Download
Start position
4
It indicates at which position in the file will the download start.
Download length
4
Total download length requested by the terminal
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
File data packet from server to terminal (0x90)
(The transmission will be launched based on the storage time)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x90
Information Content
File Type
1
0x00: Recoding file (listening) (no files of this type transmitted by server)
0x01: Recording file (SOS) (no files of this type transmitted by server)
0x02: Recording file (two-way communication)
Total file length
4
Total length of transmitted file
File error check type
1
If the file error check type is “00”, the file will be transmitted using CRC. If the file error check type is “01”, the file will be transmitted using MD5.
File error check
N
If the file error check type is “00”, the file will be transmitted using CRC and the result will be 2-bit long.
If the file error check type is “01”, the file will be transmitted using MD5 and the result will be 16-bit long.
Start position
4
Number of bytes at the start position of the transmission segmentation
Length of current content
2
Length of data after the start position of the transmission segmentation
Content
M
The data packet after segmentation
Identifier
N
The file type indicates what type is a file belongs to.
If the file type is “00 recording file (listening)”, it occupies 6 bytes. The file contains the start date and time of the listening. The coding method
is the same as that of time format in the location packet.
当 If the file type is “01 recording file (SOS)”, it occupies 2 bytes and the
bytes are the same as the serial number of the corresponding SOS
alarm packet.
If the file type is “02 recording file (two-way communication)”, it occupies 6 bytes. It contains the start date and time of the communication. The coding method is the same as that of the time format in the location packet.
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Reply by Terminal to the File Data Packet from Server (0x90)
Length
Details
Start Bit
2
0x79 0x79
Packet Length
2
Length = Protocol number + Information content + Information SN + CRC
Protocol Number
1
0x90
Information Content
Receive status flag
1
0x00: Received; 0x01: Receive error
Information SN
2
The SN will be automatically added by "1” for each data sending after power-on.
CRC
2
It is the CRC-ITU value from "Packet Length" to "Information SN". If the receiver receives a packet that contains a CRC error, it ignores the error and discards the packet (See Attachment 1 for algorithm details).
Stop Bit
2
It is fixed at 0x0D 0x0A.
Attachment 1 Fragments of CRC Lookup Table in C (V1.0)
Attachment 1 CRC-ITU Algorithm in C (Fragments) static const U16 crctab16[] =
{
0X0000, 0X1189, 0X2312, 0X329B, 0X4624, 0X57AD, 0X6536, 0X74BF,
0X8C48, 0X9DC1, 0XAF5A, 0XBED3, 0XCA6C, 0XDBE5, 0XE97E, 0XF8F7,
0X1081, 0X0108, 0X3393, 0X221A, 0X56A5, 0X472C, 0X75B7, 0X643E,
0X9CC9, 0X8D40, 0XBFDB, 0XAE52, 0XDAED, 0XCB64, 0XF9FF, 0XE876,
0X2102, 0X308B, 0X0210, 0X1399, 0X6726, 0X76AF, 0X4434, 0X55BD,
0XAD4A, 0XBCC3, 0X8E58, 0X9FD1, 0XEB6E, 0XFAE7, 0XC87C, 0XD9F5,
0X3183, 0X200A, 0X1291, 0X0318, 0X77A7, 0X662E, 0X54B5, 0X453C,
0XBDCB, 0XAC42, 0X9ED9, 0X8F50, 0XFBEF, 0XEA66, 0XD8FD, 0XC974,
0X4204, 0X538D, 0X6116, 0X709F, 0X0420, 0X15A9, 0X2732, 0X36BB,
0XCE4C, 0XDFC5, 0XED5E, 0XFCD7, 0X8868, 0X99E1, 0XAB7A, 0XBAF3,
0X5285, 0X430C, 0X7197, 0X601E, 0X14A1, 0X0528, 0X37B3, 0X263A,
0XDECD, 0XCF44, 0XFDDF, 0XEC56, 0X98E9, 0X8960, 0XBBFB, 0XAA72,
0X6306, 0X728F, 0X4014, 0X519D, 0X2522, 0X34AB, 0X0630, 0X17B9,
0XEF4E, 0XFEC7, 0XCC5C, 0XDDD5, 0XA96A, 0XB8E3, 0X8A78, 0X9BF1,
0X7387, 0X620E, 0X5095, 0X411C, 0X35A3, 0X242A, 0X16B1, 0X0738,
0XFFCF, 0XEE46, 0XDCDD, 0XCD54, 0XB9EB, 0XA862, 0X9AF9, 0X8B70,
0X8408, 0X9581, 0XA71A, 0XB693, 0XC22C, 0XD3A5, 0XE13E, 0XF0B7,
0X0840, 0X19C9, 0X2B52, 0X3ADB, 0X4E64, 0X5FED, 0X6D76, 0X7CFF,
0X9489, 0X8500, 0XB79B, 0XA612, 0XD2AD, 0XC324, 0XF1BF, 0XE036,
0X18C1, 0X0948, 0X3BD3, 0X2A5A, 0X5EE5, 0X4F6C, 0X7DF7, 0X6C7E,
0XA50A, 0XB483, 0X8618, 0X9791, 0XE32E, 0XF2A7, 0XC03C, 0XD1B5,
0X2942, 0X38CB, 0X0A50, 0X1BD9, 0X6F66, 0X7EEF, 0X4C74, 0X5DFD,
0XB58B, 0XA402, 0X9699, 0X8710, 0XF3AF, 0XE226, 0XD0BD, 0XC134,
0X39C3, 0X284A, 0X1AD1, 0X0B58, 0X7FE7, 0X6E6E, 0X5CF5, 0X4D7C,
0XC60C, 0XD785, 0XE51E, 0XF497, 0X8028, 0X91A1, 0XA33A, 0XB2B3,
0X4A44, 0X5BCD, 0X6956, 0X78DF, 0X0C60, 0X1DE9, 0X2F72, 0X3EFB,
0XD68D, 0XC704, 0XF59F, 0XE416, 0X90A9, 0X8120, 0XB3BB, 0XA232,
0X5AC5, 0X4B4C, 0X79D7, 0X685E, 0X1CE1, 0X0D68, 0X3FF3, 0X2E7A,
0XE70E, 0XF687, 0XC41C, 0XD595, 0XA12A, 0XB0A3, 0X8238, 0X93B1,
0X6B46, 0X7ACF, 0X4854, 0X59DD, 0X2D62, 0X3CEB, 0X0E70, 0X1FF9,
0XF78F, 0XE606, 0XD49D, 0XC514, 0XB1AB, 0XA022, 0X92B9, 0X8330,
0X7BC7, 0X6A4E, 0X58D5, 0X495C, 0X3DE3, 0X2C6A, 0X1EF1, 0X0F78,
};
// Calculate 16-bit CRC of the given-length data. U16 GetCrc16(const U8* pData, int nLength)
{
U16 fcs = 0xffff; // Initialize while(nLength>0){
fcs = (fcs >> 8) ^ crctab16[(fcs ^ *pData) & 0xff]; nLength--;
pData++;
}
return ~fcs; // Negate
}