![]() With only little abstraction, the logical loopback you build from one COM port of a PC to another COM port at the same PC has in common the feature that you can see your own transmission being returned at the same display screen. ![]() You could also perform a similar (yet more simplistic) test using a minimal configuration where the loopback is just a directīetween the TxD/RxD lines of the very same COM port. To the Received Data line (RxD) of a port at the same host. Signal lines of the RS-232, the Transmitted Data line (TxD) is The COM ports you connect are the typical PC implementation of the RS-232 serial interface.Ī Loopback configuration is just what the name suggests: The question is pretty wide, but I give it a try:
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