Q2686 PORT2 no responce


I want to send AT commands on PORT2.
I have fixed the baud rate to 9600
I then enabled port2

If i send a “AT” to com2, it does not respond?

Is this in data mode only, and if so how do i get port to to respond to AT commands?
Can i get PORT1 and PORT2 to respond to AT commands at same time?



Yes, it is possible that both ports respond to AT commands. This mode is default when a port is opened with at+wmfm.

However, if you do AT+ipr=9600 on port 1, this will not have an effect on port 2. You will need to send the at+ipr command from the port you would like to configure! It might be that port 2 operates on an other speed and because of that does not respond to the command…

If this does not help:

  • which OS are you using?
  • are you sure the data sent gets to the modem on the correct pins?

Best Regards,


It was the baud rate, thankyou.
Is there any way to change the baud of com2 from com1?



there is none that I know of, unless you implement an OpenAT application. An application can set configuration for all ports (so you can implement a command that sets the baud rate for com2 when called from com1).

Best Regards,