1)   Bill Serial Port Monitor 3.0L
To monitor (bi-directional) Serial communication RS-232 between two devices without physical cable, you can use the freeware Bill Serial Monitor. This freeware enable you to view, log, test and analyse the activity of the serial RS-232 port.
SERIAL PORT MONITOR, SERIAL PORT ANALYZER, SERIAL PORT ANALYSER, SERIAL PORT DEBUGER, SERIAL PORT SNIFFER, RS232 SNIFFER, RS232 PORT MONITOR, COMM SNIFFER, RS232 SNIFFER, RS232 MONITOR,