GLOBALSAT TR-206 - Manual (Page 6)

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2.2 Format of Configuration Message
2.2.1 Server -> Device
This message is used to configure TR-206 device. Each message contains
as many parameters as desired. If the message to be sent is too long, it is
separated to several packets in sequence. The maximum length of each
packet is 250 bytes.
The format is
GS S ,IMEI,T,S,x1=y1,x2=y2,x3=y3,……………………*Check Sum!
Where T field is message packet sequence control flag.
S field is message packet sequence number.
x1,x2,x3… are code words for configuration parameters.
y1,y2,y3… are their respective settings.
For example:
GSS,123456789012345,1,0,A0=1,C0=0,C1=90,C2=20*51!
GSS,123456789012345,0,1,D1=internet,E0=123.234.168.1,E1=5000*04!
GSS,123456789012345,2,2,O3= SORPZAB27GHKLMN*U!*01!
2.2.2 Device -> Server
The message is generated by the TR-206 in accordance with a reading
configuration command. If the message is too long, it will be separated into
several packets in sequence.
The format is
GS s ,IMEI,T,S,x1=y1,x2=y2,x3=y3,…………………….*Check Sum!
For example:
GSs,123456789012345,1,0,O5=test,O7=F-0TR-206STD-10021421.1.0.1.1*40!
GSs,123456789012345,2,1,OD=02,OS=120*5e!