Enabling USART2, saving in Non-volatile?

[awneil]

Note Open-AT has only UARTs - not USARTs

@markaren1

Is it possible to issue an AT command to enable UART2

Yes - but see:

FAQ forum/wiki?

But note that R7.4 opens the USB port automatically - this is a change from earlier firmware.

FAQ forum/wiki?

The need to enable USB (and UART2) before it can be used: wavecom.com/modules/movie/sc … 518#p15518 Update (2010): R7.4 (and later) opens the USB port automatically - this is a change from earlier firmware.

AT+WMFM - Inconsistent (and unhelpful) Behaviour

Ya i also experienced the same thing.If the port is already opened and you try to open it it gives +CME ERROR 3

so it may be used as a firmware download port

See your other post on the same subject:

Loading firmware

The AT Commands Manual for your particular version will state any limitations on this. Recent version support AT+WDWL on any UART (including USB); earlier versions didn’t

then saving the setting in non-volatile memory

Again, The AT Commands Manual documents whether settings are saved with or without an explicit command.