I have an EM120R-GL module connected over USB to the host running under Linux (RPi Zero W 2 running latest Raspbian) I’ve tried also on Windows laptop
I have 2 modules, same behaviour on both. Modems are from Digikey
I’ve tried M2 adapter board which worked with identical M2 Sierra Wireless modem just fine. I can see changes in dmsg and lsusb commands, while both EM120R-GL no signs of USB recognition at all
I’ve checked that power on pin is high and RST pin I’ve tried both left open (which is internal pulled up inside the module) and with external pull-up.
Power consumption is nearly 30mA
Any recommendations to have even basic communication/system identification working?