USR-G786-G User Manual
Technical Support:
Jinan USR IOT Technology Limited
www.pusr.com
40
Diagram 1
Toggles the timing of command
Toggles the timing of command mode:
In the figure above, the horizontal axis is time, data above the time axis is sent by the serial device to G786-G,
data below the time axis is sent by G786-G to the serial port.
Time requirement:
T1 > current serial port packaging interval (refer to AT+UARTFT)
T2 < current serial port packaging interval time (refer to AT+UARTFT)
T3 < current serial port packaging interval time (refer to AT+UARTFT)
T4 = current serial port packaging interval time (refer to AT+UARTFT)
T5 < 3 s
T6 = current serial port packaging interval time (refer to AT+UARTFT)
The time sequence of switching from Transparent mode to “AT Command mode” :
Serial device continuously sends "+++" to the device. After receiving "+++", the device will send an "a" to the
serial device. No data can be sent during a packaging cycle before sending "+++".
When the serial device receives “a”, a “a” must be sent to the device within 3 seconds.
After receiving 'a', the device returns "+ok" and enter “temporary command mode”.
After receiving "+ok", the device has enter "temporary command mode" and now can send AT command to it.
Time sequence of switching from AT command mode to network transparent mode:
Serial device sends "AT+ENTM" to G786-G.
After receiving the command, sends "OK" to the serial device and returns to the previous working mode.
After the serial device receives "OK", it knows that the device has returned to its previous working mode.
7.1.1.Serial AT Command
In transparent mode, do not need to switch to the command mode, we can use “pa AT command” to
query and set parameters. Generally, it is used when user’s equipment needs to query or modify parameters
when G786-G is running. It does not need complicated “+++” timing sequence to enter AT command mode, so as
to quickly query or set parameters.