SimCom GL100 Especificações descarregar pdf (Página 61)

GT300 @Track Air Interface Protocol

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4.10. Time Adjustment

The backend server can use command AT+GTTMA to adjust the local time of the device

remotely. According to the local saved city-time zone table, the backend server uses a city index

of the table to set the time zone of the device. At the same time, the backend server could provide

a referenced UTC time as the basis to adjust the device local time.

This command will also trigger the device to adjust the local time according to GPS time. After a

successful GPS fix, the device will update the local time with the GPS UTC time again.

Upon this command, the device can also set the daylight saving.

If the end user is not allowed to change the local time of the terminal, the backend user can use

this command to hide the Time and Date menu. Thus the end user has no way to change the

local time anymore.

Example:

To adjust the device local time, send the following command:

AT+GTTMA=gt300,,8,0,20090917123500,0009

By this command, the current home city is set to “Beijing”; the current UTC time is set to

“20090917123500” and according to the time zone of “Beijing”, the current local time would then

be “320090917203500”. The daylight saving is disabled.

To forbid the end user change the local time, send the following command:

AT+GTTMA=gt300,1,,,,0009

By this command, the Time and Date menu is hidden to avoid setting the time locally.

The configuration is done when the backend server receives the following message:

+ACK:GTTMA,135790246811220,0009,20090112104725,000A,0102070202

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SimCom GL100 Especificações Página 61