Rev 1.1 9/22/14 34
Communicating with the
USR3500
6.9. Firmware Upgrade Procedure
The firmware upgrade procedure is used to update the firmware embedded in the
USR3500. This procedure consists of downloading the firmware into internal memories
through the RS232 serial port available on the 15-pin SUB-D serial connector. Refer to
the Courier M2M Application Guide at http://www.usr.com/support/3500 for more
information regarding this procedure.
6.10. Main AT Commands for the USR3500
The table below lists the main AT Commands required for starting the USR3500. For
other available AT Commands, refer to the AT Commands Interface Guide at
http://www.usr.com/support/3500.
Table 17. Main AT Commands used for the USR3500
Check network
registration
The USR3500 is registered on
the network.
The USR3500 is not registered
on the network; registration attempt
is ongoing.
The USR3500 is not registered
on the network; no registration
attempt has been made.
AT+CPIN=xxxx
(xxxx = PIN code)
Incorrect PIN code (with +CMEE =
1 mode*).
PIN code already entered (with
+CMEE = 1 mode*).
+WMBS:
<Band>,<ResetFlag>
OK
The currently selected band mode is
returned.
Band switch is accepted; the
USR3500 has to be reset for the
change to be effective.
Band switch is accepted; the
USR3500 has to be reset for the
change to be effective.
Band switch is accepted and the
GSMS stack has been restarted.
Band selected is not allowed.
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