Filter captured data

COM Port Monitor offers the advanced filtering option. By setting up the monitoring filters you can track only the events you are interested in. This RS232 Sniffer lets you filter IOCTL and IRP requests. What’s especially convenient is that monitoring data can be shown in several viewing modes at a time. There are table, line, dump, and terminal data visualizers.

Track communications of multiple serial ports at a time

The program provides the ability to monitor one, two, or several serial interfaces within one session. This means you can test the COM port’s interactions with multiple devices and applications simultaneously. All communications data is recorded in a single log using the first-in, first-out method.

Record Modbus data to a file

In addition to monitoring RS232, RS422, and RS485 serial communications, the software allows reading Modbus data transferred between devices you’re testing. Serial Port Monitor helps you capture and analyze Modbus RTU and ASCII messages.

Emulate sending serial data

You can use our RS232 Logger to forward some data (it can be in a string, binary, octal, decimal, or hexadecimal format) to a port that is being monitored as though it were sent from a certain application. Thanks to this feature, you can see how a device connected to this port reacts to particular commands.

Analyze serial port activity

Serial Port Analyzer was developed to perform serial monitoring, displaying, and logging a system’s serial communication transmission. This RS232 monitor displays exactly the subset of serial data that interests you. Advanced filters let you eliminate unnecessary data, making it easier to concentrate on the information you need.

Compare monitoring sessions

To get more precise monitoring results, you can send the same data to the monitored port again. If you want to compare your current session with the one you saved earlier, simply select “Compare session” in the main menu and load the previously saved session to see the differences and troubleshoot COM port if needed.

Standard $59 Basic functionality for monitoring real and virtual serial ports. Purchase
Analyze any type of serially connected hardware or software.
Simultaneous monitoring of an unlimited number of COM ports
Logging of data received and sent from a monitored COM port
Monitoring COM ports of different types (RS232/RS422/RS485)
Sniffing RS232 ports already used by another application
Exchanging data with any serial port via Advanced Send Dialog
Changing the parameters of a serial port on-the-fly
1 license can be used on 10 computers

Show Standard Features

Analyze any type of serially connected hardware or software.

Simultaneous monitoring of an unlimited number of COM ports

Logging of data received and sent from a monitored COM port

Monitoring COM ports of different types (RS232/RS422/RS485)

Sniffing RS232 ports already used by another application

Exchanging data with any serial port via Advanced Send Dialog

Changing the parameters of a serial port on-the-fly

1 license can be used on 10 computers

PRO $99 Advanced feature set for logging COM port data and controlling serial communications. Purchase
Analyze any type of serially connected hardware or software.
Simultaneous monitoring of an unlimited number of COM ports
Logging of data received and sent from a monitored COM port
Monitoring COM ports of different types (RS232/RS422/RS485)
Sniffing RS232 ports already used by another application
Exchanging data with any serial port via Advanced Send Dialog
Changing the parameters of a serial port on-the-fly
1 license can be used on 10 computers

Show Pro Features

Analyze any type of serially connected hardware or software.

Simultaneous monitoring of an unlimited number of COM ports

Logging of data received and sent from a monitored COM port

Monitoring COM ports of different types (RS232/RS422/RS485)

Sniffing RS232 ports already used by another application

Exchanging data with any serial port via Advanced Send Dialog

Changing the parameters of a serial port on-the-fly

1 license can be used on 10 computers

Company $799 The license for large development groups that allows the software to be installed on 10 workstations, with PRO features enabled. Purchase
Analyze any type of serially connected hardware or software.
Simultaneous monitoring of an unlimited number of COM ports
Logging of data received and sent from a monitored COM port
Monitoring COM ports of different types (RS232/RS422/RS485)
Sniffing RS232 ports already used by another application
Exchanging data with any serial port via Advanced Send Dialog
Changing the parameters of a serial port on-the-fly
1 license can be used on 10 computers

Show Company License Features

Analyze any type of serially connected hardware or software.

Simultaneous monitoring of an unlimited number of COM ports

Logging of data received and sent from a monitored COM port

Monitoring COM ports of different types (RS232/RS422/RS485)

Sniffing RS232 ports already used by another application

Exchanging data with any serial port via Advanced Send Dialog

Changing the parameters of a serial port on-the-fly

1 license can be used on 10 computers

If you are interested in electronic engineering or have a non-commercial project or a hobby that involves using COM port devices and software, we will gladly provide you with a free license for our advanced Serial Port Monitor.

In return, we would appreciate if you could offer any of the following:

a review of the product;
a publication about the application;

To request a free license, please fill out the form. We’ll contact you back as soon as possible.

If you are a member of the educational community, you can apply for free licenses in this form

Please describe how you're going to use Serial Port Monitor:

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 SMP AX

Our customers love us

4.8 Based on 345 reviews

SourceForge TOP performer

Our clients worldwide have confirmed that the Serial Port Monitor is an excellent tool for testing purposes. They share their comments and reviews on Capterra, SourceForge, and TrustRadius, and we are delighted to share their thoughts about our software. Recently, the Serial Port Monitor earned the TOP performer badge on SourceForge.

Michael Hebenstreit

SourceForge review

I was already thinking about writing a minimal terminal software with this capability, but then I found Serial Port Monitor works without hassle. I know since X64 Windows this has become difficult - even Microsoft does not support their old Portman software anymore. So count me impressed!

Yusuf C.

SourceForge review

We teach electronic communication courses to our students. Children love this practice and enjoy the lesson. Thanks to the Serial Port Monitor from the Electronic Team, our lessons became more fun.

Paul H.

Capterra review

SPM allowed me to rapidly (within a couple of days) develop and test that driver, which would have taken me 2-3x longer if I'd had to debug the code by hand. SPM has a slick, modern UI and so far has been completely reliable. It just does its thing and works. It's made my development more efficient and allowed me to capture and replay data to simplify testing.

Renan Corrêa de Moura

TrustRadius review

Serial Port Monitor is the best software for monitoring Serial 232 and others. I used it for reading communication with a smart meter. The differential of Eltima is the capacity for sending messages in hex, oct... or any other format.