Dear Joe,
Thanks a lot for you quick response, the Jumpers JP1, and JP2 are on position B, and JP3 and JP4 are on position A. Whereas the DIP switches setting of R4 are on the default setting i-e 10bit, 1 start bit, 7 even bits, a parity and a stop bit, half duplex and a baud rate of 9600.(See attachment 1).
I was thinking about the M90-19-R4, wiring arrangement I made it as per the manual (See attachment 2). Can you please guide me about the wiring also.
Awaiting for you response.
Regards.