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Serial Port Monitor
Track and analyze the activity of your system COM ports

Serial Port Monitor is a professional software application that allows reading and recording serial data going through your computer’s serial ports. The program is a big help for those who develop and debug software and hardware solutions that use COM ports for serial data transfer.

RS232 Port Monitor comes with a slew of powerful features, including advanced filtering and search options, built-in terminal, convenient data visualizers, the ability to record serial communication data to a file, and more. The software has a streamlined and user-friendly interface and doesn’t require any programming skills.

There are Standard, Professional and Company editions of Serial Port Monitor.
Corporate offers and OEM

Serial Port Monitor Integration

Whether you're looking at embedded Serial Port Monitor solution as a part of your product you can consider Serial Port Monitor ActiveX as a component for implementation.
Find out more about SPM AX  

Here’s why to choose RS232 Port Sniffer:

  • It logs COM port data and saves it for later analysis

    Serial Port Monitor can sniff data transmitted over a serial port even when it is already used by another application. You can connect to any of the COM ports available in your system and capture its data in real time. This will help you identify problems that may appear during serial communication and prevent them.

    All monitoring data, including serial input/output control codes (IOCTLs) with full details and parameters, can be forwarded to a specified file or copied to the clipboard. What’s more, you can save the whole monitoring session and load it next time you need it.
  • It’s able to monitor multiple ports within one session

    There’s no need to start a new session for every port you are going to monitor. The software allows you to sniff data from several COM interfaces within one session. This means you’ll be able to track the communication of your serial app with multiple devices at a time. The data will be recorded using the first-in, first-out method and shown as a single log.
  • It offers five different data viewing modes

    Serial Port Monitor has five visualizers to display monitoring data. Those are table, line, dump, terminal, and Modbus views. You can use one at a time or all of them simultaneously. Also, you can apply IPR filters if you want to track down only communication events of a particular type.
  • It can emulate sending data to a selected serial port

    When using the software in terminal mode, you can emulate sending some special commands to the monitored port as though they were sent from a monitored application. This way you get the ability to check the reaction of the COM port and device connected to it. The data you forward can be in a string, binary, octal, decimal, hexadecimal, or mixed format.
  • It sniffs Modbus RTU and Modbus ASCII data

    In case your devices communicate using the Modbus protocol, you can read and analyze their data flows as well. COM Port Monitor parses Modbus data and shows it in the corresponding view.
  • It allows comparing monitoring sessions

    The software provides you with the great ability to compare your current monitoring session with the one you saved previously. The two sessions will be displayed in two adjustable windows so that you can easily see all the differences between them.

Serial Port Monitor full features list

Start/stop monitoring the serial port that is already opened by another application (available in Professional/Company Edition only)
Completely compatible with Windows 10 (both x32 and x 64)
Serial Port Monitor and all of its internal drivers are digitally signed
Any number of serial ports can be monitored simultaneously
Possibility to add several ports for monitoring in one session
Supports all COM-port types: standard on-board ports, extension board ports, software-based virtual COM ports, bluetooth serial ports, USB to SERIAL cradles, etc
Data transmission monitoring and logging
Advanced send dialog: easily send various types of data, apply aliases for faster typing and automation, send files and loop functions and commands, change serial port parameters on-the-fly (available in Professional/Company Edition only)
Real-time data capturing
Various monitoring visualizers: table view, line view, dump view, terminal view

Compare STANDARD and PRO/Company versions

# Feature Standard Pro / Company
1 Monitoring serial ports which are already in use
2 Sending/receiving data to/from any COM port (Advanced Send Dialog)
3 The possibility to change COM port parameters from Advanced Send Dialog
4 Any serial port software/ hardware can be analyzed
5 Monitors any number of serial ports at once
6 Supports all COM-port types
7 Intercepts all data read from/written to PC COM port
8 Built-in search
9 4 types of customizable monitoring visualizers for viewing and logging data
10 Incoming and outgoing data streams logging
What our software is capable of
Throughout its long history, our software has helped a lot of people to solve a variety of tasks and problems of absolutely different kinds. And here are some of them:
I have tried a good number of serial sniffers, but most of them were stacked with the excessive features that only increased the cost of the tool, but did not directly influence its main purpose – conveniently collect serial data. After spending some time on research, I opted for Serial Port Monitor as the most optimal variant among other similar programs.

Gregory Williams, Programmable Logic Controller Programmer

As I decided for myself, there is no need to spend money on 2 separate pieces of software, when Serial Port Monitor perfectly combines them: a serial sniffer and a terminal emulator.

John Albarn, Electromedical Equipment Technician

A sniffer that will not only collect all data but will also accessibly display it is essential during the development and debugging of the applications or hardware that work with serial ports. Serial Port Monitor’s data visualizers provide exactly that.

Richard Swanson, Software Developer

We mainly use it for debugging serial commands (byte stream) coming from various sensors on one of our mobile robotics bases. We also use it for any kind of weird serial issue that we can't figure out. It's a great product though!

Dave Kush, CTO

FAQ about Serial Port Monitor

In order to read and analyze serial port data, you should start a serial monitoring session.
Here’s how you can do this using Serial Port Monitor:
  1. Download the software and install it on your Windows PC;
  2. Start the program and select Session > New session in the main menu;
  3. In the window that will open, select the COM ports you would like to monitor;
  4. Then, select the viewing mode for captured serial data. There are five data visualizers: Table, Dump, Line, Terminal and Modbus views;
  5. Choose between the Start monitoring now and Start in new window options;
  6. Check the boxes next to the events you want to capture – Create/Close, Read/Write, Device Control;
  7. Click tart monitoring to activate your session.
With the help of a dedicated serial port scanner software, it’s possible to check whether a COM port is working. Designed for Windows, Serial Port Monitor provides a set of advanced features for serial port testing.
  • Here are just some of the app’s capabilities that will let you test your RS232 ports:
  • Starting a monitoring session;
  • Recording the incoming and outgoing serial data to a file;
  • Reproducing a monitoring session back to a serial port;
  • Comparing sessions.
Serial Port Analyzer allows you to monitor as many serial ports at a time as you need. Simply add all COM interfaces you would like to monitor to your active monitoring session and read serial data coming in and out of them.
What customers say
    • 4.8
    I really did enjoy how easy it is to review and observe the data coming in. It is probably the easiest serial port monitor I have used. It is definitely user friendly especially if you are a first time user. Read the full review...
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Overall rating 4.8
based on 75 reviews
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#1 at Serial Port Software
Serial Port Monitor
Log and analyze serial port activity
4.6 rank based on 75 + users
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