Serial Port Sniffer - read COM port data and save it to a file

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Serial Port Monitor

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What is the tool that developers of serial applications and hardware are using to analyze the activity of COM ports in their systems? It's RS232 sniffer software - a monitoring solution that provides insight into the data going through your PC’s RS232/422/485 interfaces.

One of the best serial sniffing programs that you can find today is called Serial Port Monitor (SPM). This powerful app captures COM port data and displays it in various formats depending on which data visualizer you choose.

Below, you’ll find step-by-step instructions on how to start a COM port monitoring session with SPM and save it to a file after serial communication ends.

  1. First, you download it on your computer. The app is compatible with Windows XP/2003/2008/Vista/7/8/10 (both 32-bit and 64-bit).

  2. Then, you install the program and launch it. Once your RS485 sniffer is up and running, it’s time to start a monitoring session.

  • To do this, head to the main menu of Serial Port Monitor and choose Session > New session. Also, you can use the shortcut ‘CTRL + N’ or click the ‘New’ icon on the main toolbar.
  • Serial Port Sniffer - Start new session
  • In the “New monitoring session” window that will appear, enable a visualizer for displaying captured serial data.

    The software provides four data viewing modes. They are Line, Table, Terminal, Dump and Modbus views. You are able to select one or all of them at once. RS232 Sniffer - How to select visualizers

  • Next, select the events to monitor: Read/Write, Create/Close or Device Control.

  • Finally, hit “Start monitoring”.
Start monitoring

Here you go!


After you are done with recording serial port data, just save your monitoring session to a file by selecting ‘Save session/Save session As’ in the app’s main menu.

Save COM port sniffing session

Next time you need to load this session, go to the main menu and choose Session > Open session. You will be given the option to select and load the required session file. Also, this file can be loaded after you double-click it and choose ‘Open with Serial Port Monitor’, or if you simply drag-and-drop it onto the program’s window.

Loading Serial Sniffing Session

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Serial Port Monitor
Log and analyze serial port activity
4.6 rank based on 75+ users
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