USB Modem Connection Problem

Checking Device Manager for USB and it is listing Serial Port COM3 and it is working properly.
Red LED is lit on the hardware.
Using Alpha Station
Selecting COM3 port it opens up Identifier page and once I click Sensor View &Setup, it reports “Unable to Communicate with Modem.”
I have worked over 20 years with modems and USB connections and they normally work easily, but I don’t know what to do next with this

do you get data if you open the serial port in a terminal.
Baudrate is 115200.

Bhaskar,

Can you be more specific, how? I have Terminal program from Microsoft, which I have not used for 20 years.

a serial terminal like teraterm.
you can also use XCTU. it has a builtin terminal as well. It might be a better option.

check the section serial terminal