Apps similar to Portmon include Serial Port Monitor. It's paid, but Tauno Monitor and SerialMon are free. Other options are Advanced Serial Port Monitor, Bill Serial Port Monitor, Serial Port Assistant and SUDT AccessPort. In total there are nine Terminal Emulators like Portmon for Windows, Linux, Mac and Android.
Displays, logs, and analyzes serial data from RS232/422/485 ports in real-time, features terminal emulation, customizable interface, advanced configuration, monitoring filters, session save and reload, data format switching, and detailed I/O control code recording.
United States
A Simple stand-alone serial port monitor for the GNOME desktop. It aims to be beginner friendly, small and easy to use. Not feature-rich and professional. Remembers the last settings (Theme, Baud Rate, Port etc.).
Estonia
EU
Monitors RS232 communication thru software or with simple hardware. Protocol analyzer for ABB RP570, ABB SPA-bus and NMEA 0183 protocol.
SwedenEU
This program allows you to check the flow of data through a computer's COM ports. As you can see from software name this application can work as serial port monitor. It supports full duplex mode, flexible adjusting of parameters, output received data to file, automatic and...
Russia
Free Software to monitor (bi-directional) Serial Port communication RS232 between two devices, use our free Bill Serial Port Monitor. This software allows you to view, log, analyse the activity of your full duplex serial RS-232 port.
This project is a cross-platform serial port assistant. It can run on Windows, Linux, Android, and macOS.
AccessPort is serial port monitoring tool for technicians, engineers and software developers designing or debugging serial port related projects.
Listen32 tap into RS-232 transmit signals for monitoring bi-directional communications between two devices. Two COM ports are used in the listening device, the receive line of each connected to the transmit line of one of the communicating devices.
RS-232 and RS-485 serial terminal and serial port monitor for macOS, Windows, Linux, with a Modbus RTU decoder and RS-485 sniffer, time-stamped logging, macros, triggers and ESP32, STM32, AVR firmware flashing, plus optional Lua scripting, charts, an AI assistant (BYOK) and an MCP server.
PolandEU
