Alphatronics Virtual Port Monitor 4.0 screenshot ScreenShot.
Freeware virtual com port driver and Rs232/Rs485/Rs422 serial ports null- modem cable emulator.
Com Port Packet Sniffer and RS232 Data Monitor.
Serial Port Monitor displays, logs and analyzes RS232/422/485 COM port activity.
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Virtual Port Monitor – Free download and software reviews – CNET
Analyze Your Com Port Communication Data Traffic. Freeware Modem Data Capture Utility, Connection Test Tool Packet Analyser.