GitHub - switchcraft/Serial-port-sniffer: A RS232 serial port sniffer with USB interface.
Chapter 11: Serial Interfacing
Serial Port Monitor
Portmon Alternative Anwendung - Electronic Team Serial Port Monitor
Tibbo Technology on Twitter: "Serial Tap is an affordable sniffer for monitoring #RS232, #RS485, and #TTL-Level #UART communications. The #sniffer taps into the data to #IO Ninja software in real time. It
RS232 In-Line Data Spy | Elektor Magazine
Serial Port Monitor | FREE Serial Port Monitor [für Windows]