No AT response

[Vincent Siu]

Hi,

I have the MTQ-H5-B01 and it seems to stop responding to AT commands. I’m running it with Linux and it sees ttyACM0-5. I’ve tried ‘ate1’ on all ACMs. I’ve also tried on Windows and it does not echo any characters back.

Questions:
1. Did the firmware get corrupted?
2. Is there a standalone method to reprogram it? Or would I need the UDK developer board?

Thanks, Vincent

[Mike Fiore]

Vincent,

It’s possible the radio’s baud rate got changed. Can you try a few common rates and see if any of them work?

Cheers,
Mike

[Vincent Siu]

Hi Mike,

I’ve tried 1200, 2400, 4800, 19200, 38400, 57600, 115200 but still no luck.

Thanks, Vincent

[Mike Fiore]

The radio defaults to 115200. It might be worth trying some faster baud rates as well.

Cheers,
Mike

[Vincent Siu]

Just tried 128000 and 256000, but still no response.

Do you know if it can be standalone programmable?

Thanks, Vincent

[Vincent Siu]

Update: I got the the UDK2 and tried to reprogram the MTQ. The unit still does not reply or echo back. I also tried using the DB9 on the UDK and don’t see any output.

Note the unit did work at one point, but it failed to establish a PPP connection.

Any ideas? Thanks.

[Peter Ferland]

What firmware did you write to the MTQ? Which USB port are you using on the UDK2?

If you compile and run this program, are you able to communicate with the modem through the USB port on the UDK closest to the MTQ’s USB port? https://developer.mbed.org/users/pferland/code/YYY_Dragonfly_USBTerminal/

[Author]

Posts