What is the AT command to reset USB cellular modem?

command at-command
Lin picture Lin · Feb 17, 2015 · Viewed 28.3k times · Source

What is the AT command sequence used to reset a USB cellular modem?

Is there a single AT command that can be used? Or does it require a sequence of several in order to reset a USB cellular modem?

I have a Huawei E272 and E220 however I am also interested in a general command sequence if there is any standard AT command.

Answer

user1725145 picture user1725145 · Feb 19, 2015

Resetting the modem is a manufacturer-specific AT command.

There is a spec available online for Huawei AT commands here.

Look at section 3.10 +CFUN

The EXECUTION command is used to set the MS mode or restart the MS

AT+CFUN has 2 parameters:

AT+CFUN=[fun[,rst]]

These 2 parameters fun and rst are defined as follows:

fun:
0 Set as minimum functionality mode (set the RF off but keep the SIM power on, previous mode must not be offline)
1 Set as online mode (default value) (previous mode must not be offline)
4 Set as offline mode (previous mode must not be FTM)
5 Set as offline FTM (previous mode must be online)
6 Reset MS (previous mode must be offline)
7 Set as RFoff mode (about radio frequency)

rst: Whether to restart MS before setting
0 Not restart MS before setting. (Default)
1 Restart MS before setting. (fun must be 1)

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