How do I enter AT commands for EM7355?


This is probably a dumb question but I am trying to figure out how to get to the point where I can enter AT commands for my EM 7355. I’ve downloaded PuTTY but can’t seem to access the COM port. I’ve read elsewhere that I may need to enable or unlock the COM ports for the EM 7355 but the only reference I found was from 2014 and the download link doesn’t work anymore.

Any suggestions would be greatly appreciated.


do you see the modem port in Windows platform?


I didn’t see the ports originally until I re-installed the drivers. Now I see “Sierra Wireless DM Port (COM6)” in Device Manager. I thought I could use PuTTY to connect to COM6 but I don’t get any feedback from any of the commands I enter.

Maybe there is another COM port I need to open?


You should use modem port for AT command.


That makes sense, any idea how to access the modem port or enable it?


Ah, got it now. I found out what port the modem is and it’s working now. Thanks so much for your help.