o Format：STTT
o Precision is 0.1℃
o The first byte “S” mean sign， such as“0/1/-”
o Eg：0345 mean +34.5℃，1234 mean +123.4℃，-123 mean -12.3℃
• Serial(4 Bytes) —— Serial number：
o Format：SSSS
o Every time reboot the device or reset,the serial number will initialize to
0001.
o Every GPRS message send out will add one
o After the serial number to 9999, restart from 0001 again
The link of the explain about the CRC-16(modbus):
http://www.lammertbies.nl/comm/info/crc-calculation.html
4. SMS instruction list.
If you want to know more about the AVL, and design your special AVL,
you can refer to the SMS instruction list.
$$$$$$ is user`s password , and initial password is 000000
SMS Instruction Format Note
1 Request one position *$$$$$$,000#
2 Modify user password *$$$$$$,001,@@@@@@# $$$$$$ is old password
@@@@@@ is new
Password
3 Set the time intervals of position
notice SMS
The Position SMS will send to
the preset SOS number.
*$$$$$$,002,X,Y# X ( Max 3 Digital)
=0, Stop send position SMS
=[1,999] Time interval (Unit:
mins)
Y (Max 3 Digital)
=[1,999）times send SMS
Y=0, Disable this funiction
Y=999, continue send SMS
4 Set a preset phone & SMS
number for SOS button
*$$$$$$,003,0,F,CallNumber,
SMS Number#
F = 0, Disable this function
=1, Only send an alarm
SMS to the preset SMS
Number
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General