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I want to use TRM240 in one of my microcontroller which is having only serial port.

Can I connect TRM240 this microcontroller's serial port with TRM 240's USB port with USB to serial converter ?

<<Microcontroller with serial port>> --- <<USBtoSerial>> --- <<TRM240>>

MIcrocontroller is baremater and not support installation of usb drivers.

Or another option is like any configuration of TRM240 to make usb port work as a serial as below:

https://wiki.teltonika-networks.com/view/TRB142_RS232#Over_IP

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hi,

Can I connect TRM240 this microcontroller's serial port with TRM 240's USB port with USB to serial converter ?  <<Microcontroller with serial port>> --- <<USBtoSerial>> --- <<TRM240>>

Hard to say, depends on your used converter and microcontroller.

-
Or another option is like any configuration of TRM240 to make usb port work as a serial as below:

No, TRM do not have such feature.