how to prove working of RS-232 full modem working PC to PC & LOOP BACK

[getasif]

Hello there I am a newbie trying to prove the working of RS-232 Full modem and also one RS-422( RX,TX,RTS,CTS)

These 2 ports are on a custom designed board and I need to prove the working.I am able to confirm the working at register level but I need to prove the working using softwares like Minicom or any other custom program.


How can I prove the working of these ports from one PC to a different PC using DB 9 connections and LOOP BACK too

Can someone help me with this ..Do I need to use any extra hardware to prove the working of this in Linux.

Thanks and regards

[dilbert]

You'll need a nullmodem aka crossover cable where Tx/Rx and RTS/CTS are crossed (between 2 PCs).

Then, you'll need to know or guess the ports, Usually, on Linux COM1 is /dev/ttyS0. You don't minicom. You can send with the shell command:
echo "text" > /dev/ttyS0
or with
cat ascii_file.txt > /dev/ttyS0
and receive with
cat < /dev/ttyS0