Monitor RS232/422/485 COM ports in network

Serial Port Monitor lets users monitor the activity of serial ports on their computer via a network connection. The application gives users critical information about the status of com ports and the devices connected to them which makes the application great for troubleshooting connections. A host of advanced features allow IT pro's to use the program as part of their diagnostic process.

Monitor Serial / COM ports over network

Serial Port Monitor is a professional application for RS232/422/485 COM ports monitoring. It monitors, displays, logs and analyzes all serial port activity in a system. It can effectively be used for monitoring serial data exchange between serial devices and any Windows application, debugging computer connection with peripheral devices using COM port - such as modem, mini-ATS, projector, etc, for solving problems with serial (RS232/422/485) data communication control networks and devices, for software and hardware testing and much more. It can monitor any software/hardware that works with a serial port, intercept and record all serial input/output control codes (IOCTLs), tracking their full details and parameters.

Serial Monitor offers advanced filtering and search, professional built-in terminal and data exporting options, user-friendly and flexible interface among its key advantages. It is a completely software solution, you don't need any additional hardware to use it.

This software can be used by anyone without any limitations and restrictions.


  • Monitors various different COM ports
  • Ability to monitor devices attached to ports
  • Great for troubleshooting
  • Usefull for diagnostics


  • Only suited for use by advanced users
  • Reports can be difficult to understand at first
  • Resource intensive when in use
  • Getting to know your way around requires time

Older versions

Program available in other languages

User reviews about Serial Port Monitor

  • Spencer Krit

    by Spencer Krit

    I haven't found a good free tool that will emulate a port and record/replay comms.
    According to my experience, Serial Port Monitor is far best.  More

  • Anonymous

    by Anonymous

    64-bit+virtual environment. Serial port is shareable!.
    Haven't found any alternatives for the 64-bit environment.
    This tool allows to work More

  • Anonymous

    by Anonymous

    Helpful for everyday usage.
    Compairing to the closest competitors, this app is much more easier and stable.
    Filtering and search tools ar More

  • Anonymous

    by Anonymous

    Good solution for everyday monitoring of the serial port..
    As long as native Microsoft utility PortMon doesn't support 64-bit environment, I had More


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