MC7455 ttyUSB* Info



N00b question here…
I have a MC7455 modem. I want to know what the difference is between ttyUSB0, ttyUSB1, ttyUSB2. I’ve been able to connect to ttyUSB2 through minicom and use various AT commands. What are the other 2 used for? QMI stuff?




So they are as follows.

  • /dev/ttyUSB0 - Diagnostic monitoring (DM) port, you can log low level information from this using SWILog on Windows or the dmcapture script from the QMI SDK (its only a script and can be used/run without using QMI).
  • /dev/ttyUSB1 - NMEA data if you are using the GNSS on board.
  • /dev/ttyUSB2 - AT commands.




Thanks, Matt!

I feel like I’ve searched a lot for this information, but have not been able to find it. Do you know of a link I can go to and read more about this?


Not really, it is probably buried in the documentation somewhere but this enumeration parttern is standard for the QC based devices.