Analyze serial port data with the best software

Olga Weis

RS232 standard is popular in many scientific directions and is widely used for lab equipment, quality and process controllers, various sensors, measuring tools, etc. However you may experience some issues while trying to analyze serial port activity. A number of aspects has to be taken into consideration: hardware and cabling, communication settings and protocols. To be able to perform COM monitor activities successfully and detect any issues with serial data, you'll need a reliable serial port sniffer with a comprehensive RS232 activity log.


  1. Serial Port Monitor by Eltima Software
  2. Free Serial Protocol Analyzer by HDD Software
  3. SerialMon
  4. Advanced Serial Port Monitor AGG
  5. Technet Portmon

1. Serial Port Monitor by Eltima Software

First on our list is Serial Port Monitor - a high-quality COM port sniffer product that can log, display and help you analyze RS232/422/485 port activity in the system. Getting all the data from this useful app allows for quality application and drivers development, as well as testing and debugging of COM port devices. No additional hardware is required for Serial Port Monitor is is a complete software solution. There are Standard and Professional editions depending on your needs.

Serial Port Monitor
  • With Serial Port Monitor you can connect to ports that are already open and start monitoring at once. Data is captured in real time and displayed conveniently. Data packets are easy to compare. You can record IOCTLs with all details and parameters.

  • This COM port sniffer can monitor several ports at once so users can get the data on how apps interact with several serial devices within a session. The collected data can be viewed as table, line, dump or terminal, with sump view being able to show binary, ASCII data and port settings. Another great feature this serial port testing software offers is emulating data transmission to a serial device so you can see and analyze the reaction of a device to certain commands and data. You can send string, binary, octal, decimal, hexadecimal, or mixed data.

  • The popular Modbus RTU and Modbus ASCII protocols are fully supported with all essential filters for the most effective analysis.

  • Serial Port Monitor is the most precise RS232 testing software thanks to the possibility to reproduce the monitoring session in order to review certain port behavior with the same parameters used in different conditions.

2. Free Serial Protocol Analyzer by
HDD Software

Another software solution, without any hardware needed. Free Serial Port Monitor can intercept, display and analyze data exchange between a device and a serial application. Also a useful solution for software, device driver or serial hardware development that helps you test, debug, and optimize your product. It will dig into data flows and protocols and display everything in a comprehensive way.

Free Serial Port Monitor

3. SerialMon

SerialMon is a free RS232 port analyzer for Windows that takes up little space. It can monitor serial port communication through a software or with a simple hardware solution. Supports ABB RP570, ABB SPA-bus and NMEA 0183 protocols.


4. Advanced Serial Port Monitor by AGG Software

This serial COM port monitoring solution supports full duplex mode, has multiple flexible parameters, works in automatic and manual modes, exports data to a file, and has a device simulation mode. This software is developed for advanced users and automation pros.

Advanced Serial Port Monitor

5. Portmon for Windows

Portmon can monitor and display all serial port activity in a system. Also a good tool for tracking down possible issues with apps or devices configurations and analyzing serial port usage by the apps. This solution offers remote monitoring. You can monitor many remote computers at the same time. Multiple filters help you see the data conveniently and analyze it faster. This COM monitor can export captured data to a file like the previously reviewed solutions.

Portmon for Windows

Thank you for reading our top serial port monitor tools selection. Whatever you are working on, choose a reliable and best performing piece of software to achieve the most satisfying results.

Serial Port Monitor

Requirements: Windows XP/2003/2008/Vista/7/8/10/Server 2012 , 9.16MB size
Version 7.0.312 () Release notes