Serial Port Sniffer is a specialized system utility that captures serial data packets transferred by another program to a serial app or device over an RS232 interface.
With an efficient sniffer tool, you can monitor the activity of any COM port in your system. Also, it will help you test serial applications or device drivers you’re developing. If the monitored program is created by you, your COM port sniffer can serve as an RS232 debugger allowing you to track down errors which may occur during serial data exchange.