GLOBALSAT TR-151 - Manual (Page 18)

2.1.9 How to make TR-151 to make SMS & GPRS immediate report
by SMS?
You can send an SMS to ask TR-151 to immediately report its position via GPRS network to
TR-151 call center or GPRS server and to SMS receiver interface like handset.
The format of SMS is as below.
?21,IMEI,Return_Phone_Number!
Format Description
?21 Start sign and function code
IMEI IMEI of TR-151
Return_Phone_Number The phone number for receiving OK message.
! End sign
TR-151 will send an SMS whose format is “?21,IMEI,OK!” to the return phone number to
confirm it has received the request. And then it will start to get fixed the position. After getting
fixed the position, it will send its location to the TR-151 call center or GPRS server and to SMS
receiver interface like handset.
Example: Require SMS & GPRS immediate report sent to 626-123456 and to GPRS server
You have to enter “?21,355632000166323,626123456!”
And then you will get “? 21,355632000166323,OK!”
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