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GV200 @Track Air Interface Protocol

TRACGV200AN003 – 36 –

3.2.10. Time Adjustment

The command AT+GTTMA is used to adjust the local time of the device remotely. Upon this

command, the device will set the time zone and daylight saving accordingly. Then it will use the

given UTC time to adjust the local time based on the time zone and daylight saving setting.

This command will also trigger the device to start GPS. After a successful GPS fix, the device

will update the local time with the GPS UTC time again.

 AT+GTTMA=

Example:

AT+GTTMA=gv200,-,3,30,0,20090917203500,,,,,0009$

Parameter

Length(byte)

Range/Format

Default

Password 4 – 6 '0' – '9' 'a' – 'z' 'A' – 'Z' gv200

Sign 1 +|– +

Hour Offset <=2 0 – 23

Minute Offset <=2 0 – 59

Daylight Saving 1 0|1

UTC Time 14 YYYYMMDDHHMMSS

Reserved 0

Serial Number 4 0000 – FFFF

Tail Character

 <Sign>: Indicate the positive or negative of the local time offset to UTC

 <Hour Offset>: UTC offset in hours

 <Minute Offset>: UTC offset in minutes

 <Daylight Saving>: Enable/disable daylight saving time.

 0: Disable daylight saving

 1: Enable daylight saving

 <UTC time>: UTC time to adjust the local time..

The acknowledgment message of AT+GTTMA command:

 +ACK:GTTMA,

Example:

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Queclink GV200 Spécifications Page 37