USR-G760c User Manual
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4. AT Command
4.1. Switch Command Mode
When module working in SMS transparent transmission mode, network transparent transmission mode or
HTTPD Client mode, it can switch to “AT command mode” by sending specific time-series data to serial port.
Also it can return to previous working mode by sending specific commands.
In above picture, abscissa axis is the timeline. Data on the above is send from device to module, data
under it is send from module to device.
Time requirement:
T1 > 200ms
T2 < 50ms
T3 < 50ms
T5 < 3s
The time series for switch to “AT command mode”:
Serial device send “+++” to module. Module will reply an “a” after receiving “+++”. Before sending
“+++”, for 200ms, can NOT send any data.
Serial device need to send an “a” to module after receiving the “a”.
Module will reply “+ok” to device after receiving the “a” and get into “temporary command mode”.
When device receive “+ok”, it knows the module is on “temporary command mode”, then it can send
AT command to module.
The time series for switch to previous mode:
Serial device send “AT+ENTM” to module.
Module send “OK” after receiving “AT+ENTM” and get into previous mode.
Device will know module get back to previous work mode when receiving “OK”
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