GPS Tracker auto GPS from Wonderful

This is the GT08 GPRS data format communication protocol, this protocol is defined to make available a datagram mode of packet communication, and it provides a procedure for application programs to send messages to other device.

Command Format Specification

Note: All multi-byte data is based on high-byte first, low-byte after for organization in this protocol.

Code 

Explanation

2Bytes, indicates header of command from tracker unit to call centre, in ASCII code (hex is 0x24).

Len 2Bytes indicates length of all command, including header and end (the array is first high to low).

IMEI 15Bytes, at most 20 bytes.

Alarm type 2Bytes, the GPRS data trigger type.

DATA GPRMC string

PDOP

HDOP

VDOP

Status (12bytes)

RTC (14bytes)

Voltage (8bytes)

LACCI Location information elements (AGPS)

Temperature Temperature information

Milometer Mileage data

Serial ID 4bytes, sign every GPRS data, the range is [0001-9999], then circle it again from 0001 to 9999.

Checksum 2Bytes, means CRC check of all the data ahead, CRC-16 mudbugs (Polynomial = 0xA001.initialize data is 0xffff) checksum, not including its own byte and end characters. For example: (hex format)

24 24 00 11 13 61 23 45 67 8f ff 50 00 80 43 0d 0a

0x8043 = CRC-16 mudbugs (24 00 11 13 61 23 45 67 8f ff 50 00).

\r\n 2Bytes, end char (hex format is 0x0d, 0x0a).