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How to Sniff Modbus Data:
Best Real-time Monitoring Software

Serial Port Monitor (SPM) is a powerful Modbus sniffer tool serving as an optimal solution for analyzing data transferred within Modbus communications. Thanks to SPM’s outstanding functionality, you can easily detect and resolve any problem you may face when providing Modbus testing and debugging. The distinctive advantage of the software is its ability to display and log all the data transmitted through COM ports available in your system.

With the advanced search and filter options, offered by this efficient Modbus sniffer software, only relevant serial data will be shown to you. Another great SPM’s feature is a built-in terminal used for executing text commands. Serial Port Monitor is an easy-to-use app that supports different formats for exporting data and provides you with numerous significant options.

Serial Port Monitor can be purchased as a Standard, Professional or Company Edition.

Here are the key Serial Port Monitor capabilities:

  • COM port data analyzing

    The moment SPM connects to the required COM port, it starts analyzing serial data transferred through it. By monitoring serial ports in real time, you can track down emerging issues and react immediately. Even when a COM port is used by another application, you’ll still have no problem connecting to it with the software.

    All data, collected by SPM, can be viewed in different modes, which greatly simplifies the process of data comparison and evaluation. In addition, Serial Port Monitor can work as Modbus RTU sniffer.
  • Simultaneous monitoring of multiple ports

    SPM is capable of recording data from several COM ports within the same monitoring session. That means, you can see several applications communicating with different devices through several serial ports simultaneously. Using the first in, first out method for data logging, the software makes it easy to analyze monitored communications.
  • Displaying data in different modes

    Captured data can be displayed in different visualizations. The software offers Line, Table, Dump, and Terminal views. Each visualization provides its own benefits, so, depending on your needs, you are able to choose whether to watch the data as recorded IRPs, displayed in a table, ASCII characters, or a plain text, displayed in lines.
  • Emulation of data transfer

    If you want to test the reaction of a particular device to a specific command, SPM will help you do this by simulating sending data to the required device from the monitored COM port the device is connected to. The software supports binary, octal, decimal, hexadecimal, and mixed data formats.
  • Comparing Modbus communication sessions

    It’s a really good idea to compare monitoring sessions if you need to get more accurate results within Modbus communication being analyzed. Once you receive Modbus data from your application, SPM enables you to emulate its transfer to the serial port again. This way, you can see all differences between sessions and compare the data received.

Serial Port Monitor full features list

Ability to start and stop tracking a COM port used by other applications
(PRO and Company versions);
Full compatibility with Windows 10 (both x32 and x64);
Monitoring several COM ports at a time;
Adding multiple ports to one monitoring session;
Support for serial ports of all kinds: standard on-board ports, software-based virtual COM ports, USB-to-serial cradles, and more;
Analyzing data in a real-time mode;
The software as well as all its drivers are digitally signed;
Visualizing captured data in different views: Table, Line, Dump, and Terminal;
Logging both sent and received data flows;
Ability to transfer a file in the size defined by a user or divide it into separate files;

Corporate, OEM & Source code

Whether you're looking at redistributing our Serial Port Monitor technology as a part of your product or considering Serial Port Monitor software for an enterprise-wide deployment, we offer flexible and affordable corporate solutions designed to meet your needs.

Source Code License

Ordering Source Code license for Serial Port Monitor you receive all extensively commented programming source code (GUI sources are not included). Our leading developers will help you implement Source codes and understand the advanced part of the product.

Read our Source Code license terms and conditions

Site Licensing

Unlimited Site License grants you the right to install and utilize Serial Port Monitor application with GUI on unlimited number of computers by all workers of your company worldwide. It is the ideal solution if your company has representation offices in the different parts of the world.

If you know the certain number of computers to be equipped with Serial Port Monitor you may consider obtaining Limited Site License. The advantage of Site Licensing comparing to multiple Single licenses is one license key for all company computers.

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 Monitor any number of serial ports at once
6 Supports all COM-port types
7 Intercepts all data read from/written to 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

Custom Software Development

Whether you’re looking at modifying functionality of our current software solutions or developing a new product from scratch, we can make it happen!

What customers say

  • Without the Serial Port Monitor from Eltima, I would not have been able to easily and quickly see the operation of the several serial ports carrying data to the navigation program...
    Jon Kinne

Overall rating 4.6
based on 75 reviews

Let's get started

Serial Port Monitor for Windows
Demo version limitations
• fully functional 14-day trial
System Requirements
Windows (32-bit and 64-bit): XP/2003/2008/Vista/7/8/10, Windows Server 2012, Windows Server 2016
Latest Update
Version 7.0.312 (18th Apr, 2017) Release notes