No response from /dev/ttyUSB2

IoT Modules
1

I have MC7455 and my system is ubuntu 20.04.
I am able to see /dev/ttyUSB0, ttyUSB1 and ttyUSB2.
However, I don’t see any response from ttyUSB2 with minicom with any at command, like ate0:
sudo minicom -D /dev/ttyUSB2

Below is serial module used in my system:
qcserial 28672 0
usb_wwan 24576 1 qcserial
usbserial 53248 2 qcserial,usb_wwan

Any idea why this happens?

Thanks,

2

Hi fc.jeng,

Let’s try with baudrate 115200
sudo minicom -D /dev/ttyUSB2 -b 115200

Thanks,

3

Still no response with 115200.

Thanks,

4

Hi fc.jeng,

Have you tried USB0 or USB1 with baudrate 115200 ?

Thanks

5

modemmanager in Ubuntu could be interfering with the modem’s operations. Please remove modemmanager and retry.

6

Thanks for all responses. I resolved this issue by updating the latest firm.

Best regards,