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Программа-сниффер, которая позволяет отслеживать трафик COM-порта вашего ПК. Также позволяет тестировать, контролировать и управлять любым оборудованием, совместимым с протоколом RS-232, RS-485, RS-422 или любым другим совместимым устройством COM-порта (полное описание…)
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Master your serial communication challenges with our advanced Serial Port Sniffer for Windows. This essential tool monitors data traffic between your applications and COM ports, allowing you to diagnose issues and streamline debugging processes. Perfect for developers and engineers alike, our sniffer offers an intuitive interface and powerful features to enhance your productivity.
The serial port sniffer allows studying the data exchange’s peculiarities of any Windows program. If you have developed the researched program, the serial/RS232 port sniffer turns into an RS232 debugger, which allows you to trace down and troubleshoot problems appearing in serial communications.
How can I sniff serial port communications using Advanced Serial Port Monitor?
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Launch our Serial Port Monitor.
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Select the «Spy» mode.
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Select the necessary RS232 port number from a drop-down menu.
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Start port monitoring by clicking the «Open» button _before_ another application starts using that port.
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Select an appropriate data view mode between ASCII and HEX.
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Monitor RS232 traffic in real-time, or start saving it using the «Write to file» button.
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Close the monitoring session by clicking the «Close» button.
Download a Free Trial Version
Serial Port Sniffer & Analyzer
Key Features of the Serial Port Sniffer
Monitors Windows kernel-level I/O packets (output control codes, IOCTL) sent/received between serial port device drivers. | Yes |
Interception of device control commands | Yes |
Show info about port parameters used by another serial application (baud rate, number of data bits, etc.) | Yes |
Monitoring activity of other software applications | Yes |
Capturing serial port traffic | Yes |
Virtual environment and virtual machines | Yes |
Logging to a file that you can use for future analysis | Yes (Binary or Text) |
Proprietary protocols, Custom protocols, Protocol analyzer | Limited |
Advanced Features (ports autodetection, serial port name) | Yes |
MODBUS RTU & ASCII monitoring | Yes |
Advanced Filtering | The filtering capabilities in our sniffer allows you to filter out unnecessary kernel I/O requests |
Advanced Data Filtering Capabilities | No |
Convenient data visualizers | HEX, Text, ASCII symbols, and codes |
FAQ
Does your software use a driver?
Yes, our software solution has a particular device driver that our program attaches to an RS232 device’s driver. Our driver captures all communications and system requests with precise timestamps. You can get information about used baud rates and other communication parameters in most serial port software.
Is it compatible with Windows 10 and 64-bit operating systems?
Yes, our serial sniffer driver is compatible with the modern OS and has the necessary digital signatures.
Can your utility work with full-duplex?
It works by default because it inserts our driver in the middle of a serial device driver and another program. So, you can implement a bidirectional data sniffing interface.
What serial port types does your sniffer support?
Our serial software supports real and virtual COM ports (VCP) of various types, like RS232-USB (USB cables), RS232-LAN, Bluetooth, software-based Virtual COM port, etc. You do not need a special sniffer cable or an active RS232 sniffer cable. Still, you can optionally use it in the «Dual port» mode to monitor the serial connection between two external devices.
Download a Free Trial Version
Easily sniff traffic & capture data
Who can get benefits from a serial port sniffer:
- Serial protocol development by software system engineers.
- Industrial control equipment support teams can test industrial equipment and industrial automation systems.
- Hardware developers while creating new hardware solutions.
- DIY: try to send commands and watch responses from a connected device using USB UART dongles.
Eliminate RS232 cables
Using the serial port sniffer mode, you can monitor serial port activity without any cables and additional hardware.
Multiple COM ports at the same time
Start several instances of our COM port sniffer and monitor communication with your peripheral devices simultaneously. The program allows you to store the settings for each copy individually.
Easy-to-use
The RS232 monitoring tool does not require special knowledge, and students and professionals can use it to test/debug/view serial communication. You can use the RS232 monitor without any programming skills.
Free serial port sniffers on the market
Portmon monitors Windows kernel-level I/O packets sent/received between serial port device drivers. It didn’t update for some time and may not work on modern versions of Windows.
How can our serial software replace free Portmon?
Apart from Portmon, our software does not show low-level I/O requests, but decodes them to a human-readable form.
How can our software help decode serial communication protocol?
When studying serial communication protocols, you may want to repeat the same command sequence sent to serial equipment. You can quickly switch from the sniffer mode to the manual mode, repeat RS232 communications using our «Replay logs» plugin.
Download a Free Trial Version
The powerful alternative for free Portmon or other sniffers
See also
RS232 Analyzer from Advanced Serial Port Monitor
RS232 Monitor is a unique monitoring tool for communications via RS-232
Capture and analyze COM port traffic with our Windows RS232 serial port sniffer
Spying on a serial port or RS232 port using our Serial Port Monitor software
RS232 terminal
UART monitoring using our Serial Port Monitor
COM port scanner
5 common errors with COM port operations in Windows
How to find application COM port and list all COM ports in Windows
Free Serial Port Monitor Windows 10, 11 — SimpleTerm SE (Student/Personal)
This is an advanced serial port monitor, simulation and RS232 data capture and analysis tool. Use to log, monitor, analyse or automate RS232 communication or simply use as an ASCII RS232 Terminal for basic serial port communication and RS232 device configuration.
It is a high performance 32-bit application designed to run on almost all PCs running e.g. Microsoft Windows XP, Vista and Windows 7/8, Windows 10 (32 & 64 Bit Editions) and Windows 11.
Schools / colleges and Universities (Free)
Download the demo and request a FREE LICENSE KEY via email. Inform us by email of which school/college/university you study at.
Personal User License (item 1121)
Personal user license order item 1121 online (email delivery only).
Join thousands of other SimpleTerm customers with our app style pricing — activates download below.
Commercial / Professional Use License (item 1120)
Commercial professional user license — just add item 1120 to shopping cart!
SimpleTerm — Serial Port Monitor is a thoroughly tested, mature, highly stable product used worldwide by professional engineers, technicians and software developers as a development aid and debugging tool for RS232 / serial port related projects. It’s easy to use «simple» user interface also makes it a favourite amongst serial port novices and professionals alike. Don’t take our word for it — try out the free versions!
Operates on with the serial / COM ports provided by your operating system. Physically, these ports will be RS232 SUB D9 serial port interfaces in most cases. However, it is also possible to use SimpleTerm for other communication standards such as RS485 and RS422, which have a different electrical design to RS232 but follow the RS232 communication mechanism. Also supported are Virtual COM ports presented by e.g. USB-Serial adaptors & Bluetooth™ Serial Port Profile devices.
SimpleTerm is also known as an RS232 Analyzer as it provides superb data viewing and capture features for post analysis.
It comes with popular CRC analysis as standard.
Download the registerable app — FREE SERIAL PORT SOFTWARE (Windows 7 — Windows 11)
Download SimpleTerm Standard v3.1.1
Download SimpleTerm SE — Manual (PDF)
See also Free software and terminal program based on SimpeTerm SE.
U.S. Copyright Law says:
{Title 17 U.S.C. Section 101 et seq., Title 18 U.S.C. Section 2319}
Copyright infringements can be punishable by up to five years in prison and $250,000 in fines. Repeat offenders can be imprisoned for up to 10 years. Violators can also be held civilly liable for actual damages, lost profits, or statutory damages up to $150,000 per work.
Conversely, when you buy a fully authorized version of Serial Port Monitor you get complete access to product updates which include bug fixes and regular upgrades to your software product. You also can take advantage of customer support if the need arises.
Electronic Team, Inc. guarantees that all of their software applications have passed a quality control test ensuring that they are stable and free of any malware.
If you have inadvertently downloaded and are using a pirated copy of the Serial Port Monitor, you can apply for a discount on the purchase price of a fully licensed version.
The key features of the software
Serial Port Monitor is chock-full of advanced features and here are just some of them:
Serial data logging
Whether you want to check if a specific serial device is sending or receiving data as it should, or you need to see which data is going through the exact COM port, Serial Port Monitor will easily capture, log, and present the data in an extremely easy-to-read way. More than that, the advanced filtering and search options supported by the program will greatly simplify your work.
Analyzing COM port data
Anytime you need to read data going via a particular serial port, you can connect to it with advanced Serial Port Monitor even if the port has already been opened by another program. The software will capture data in real time and show it in one of its viewing modes (or all of them at a time, if necessary), so you can immediately compare and analyze it.
What’s also nice is that the software allows copying the captured data to the clipboard or redirecting it to a file. This way, for instance, you can read and save serial input/output control codes (IOCTLs) with full details and parameters.
Sniffing multiple ports at a time
Another thing that you can find extremely useful about the program is its ability to sniff several COM ports simultaneously. With this unique option, you can check how your serial app communicates with multiple interfaces or devices at a time within one monitoring session. Plus, the received and sent data will be recorded into a single log using the first-in first-out method, which is especially convenient for data analysis.
Presenting data in different viewers
Without a doubt, the availability of four different data visualizers is one of the program’s advantages over other similar solutions. Serial Port Monitor Windows 10 solution can display data in table, line, dump, terminal mode, or all of them simultaneously. You can choose between the modes depending on your goals. Each visualizer has its benefits. For example, the Dump view displays data in hexadecimal and string formats, whereas the Table view presents the table consisting of the recorded IRPs, etc.
Emulation of sending data
Using the terminal mode feature, you can emulate sending serial data to the sniffed port. The port will recognize data as though it were sent by a particular application. This way you’ll get the ability to track the reaction of required devices to special commands and data. Serial Port Monitor supports string, binary, octal, decimal, hexadecimal, and mixed data formats.
Support for Modbus protocol
Serial Port Monitor works with Modbus RTU and Modbus ASCII protocols. In addition to Modbus data, this program will let you read and record communications with RS485/RS422/RS232 devices and apps.
Learn more about the basic principles of Modbus communication and the most efficient Modbus monitoring software and hardware solutions for testing and debugging Modbus-based devices and networks with Modbus tester guide.
Session playback feature
With Serial Port Monitor Windows 7, 10, you can resend data received from a particular serial application to the port one more time. This method will let you check if your monitoring results are precise as you’ll be able to review COM port’s behavior on receipt of the same serial data. Above that, the differences between the monitoring sessions can be displayed automatically, thanks to the outstanding capabilities of the software.
Serial Port Monitor is a user-friendly software that aside from a host of advanced features offers a clean and intuitive interface.
Here’s how to create serial port monitor connection and use this program for sniffing serial interfaces:
- Download Serial Port Monitor and install it on your computer.
- Launch the app and start a monitoring session.
To do this, head to the Main menu > Session > New session. Alternatively, you can click the ‘New’ on the main toolbar or use the ‘Ctrl + N’ keyboard shortcut.
- Now, in the “New monitoring session” window, choose the view modes which will be used to display the captured data.
Select the desired modes or use the ‘Select all ’ or ‘Select none’ buttons to simplify your selection.
- Then, decide on whether to start the monitoring session immediately or start it in a new window.
- You can also specify what events you are interested in with the ‘Capture options’ – Create/Close, Read/Write, Device Control.
- Finally, click the ‘Start monitoring’ button to start your session.
In order to save a monitoring session, choose ‘Session > Save session/ Save session As’ in the Main menu. Or click ‘Save’ on the main toolbar or use the ‘Ctrl + S’ keyboard shortcut.