RS232 is 1:1 communication.
Generally, RS232 need 3 wires.
We can know that wire connection by this picture.
A's Tx is B's Rx.
B's Tx is A's Rx.
Gnd is common.
So, we don't monitoring.
If you connected another device, communication is fail.
But If you using PPA, you can monitoring.
PPA need Rx and Gnd.
PPA1 can monitoring B's Tx(A's Rx), PPA2 can monitoring A's Tx(B's Rx)
If you using PPA program, you can monitoring real-time RS232 communication.
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