It relays all the data flowing in both directions. The SerialSniffer is connnected both to the virtual port VP2 and to the real port P1.The Communicating Software, that normally talks to the Connected device through a real COM port, is programmed to use the virtual port VP1 instead.com0com installs two virtual ports VP1 and VP2 internally connected each other.That creates a virtual "null-modem" connection between two virtual serial ports on the PC. This solution relies on the well known com0com open source signed device driver available here. ![]() ![]() In this version, one of the devices must be a PC running. A serial sniffer sits between two devices communicating through a serial channel, typically RS232C, and reads (sniffs) all the data interchanged between the devices.
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