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• Free Serial Port Sniffer
• Serial Port Sniffer For Windows
• Com Port Sniffer For Windows 7
• Serial Port Sniffer Windows 7
• Com Port Sniffer For Windows
• Serial Port Sniffer Open Source

You can't capture traffic of a COM port (serial Port) on Windows with Wireshark, as the capturing library (WinPcap) does not support this. What you need is a COM port sniffer for Windows.Please google that.

By Mark Russinovich

Published: January 12, 2012

1. Advanced Port Scanner is a free network scanner allowing you to quickly find open ports on network computers and retrieve versions of programs running on the detected ports. The program has a user-friendly interface and rich functionality.
2. Jan 12, 2012  Portmon for Windows v3.03.; 3 minutes to read; In this article. By Mark Russinovich. Published: January 12, 2012. Download Portmon (226 KB) Run now from Sysinternals Live. Portmon is a utility that monitors and displays all serial and parallel port activity on a system. It has advanced filtering and search capabilities.

Download Portmon(226 KB)
Run now from Sysinternals Live.

Introduction

Portmon is a utility that monitors and displays all serial andparallel port activity on a system. It has advanced filtering and searchcapabilities that make it a powerful tool for exploring the way Windowsworks, seeing how applications use ports, or tracking down problems insystem or application configurations.

Portmon 3.x

Version 3.x of Portmon marks the introduction of a number of powerfulfeatures.

• Remote monitoring: Capture kernel-mode and/or Win32 debug outputfrom any computer accessible via TCP/IP - even across the Internet.You can monitor multiple remote computers simultaneously. Portmonwill even install its client software itself if you are running iton a Windows NT/2K system and are capturing from another WindowsNT/2K system in the same Network Neighborhood.
• Most-recent-filter lists:Portmon has been extended withpowerful filtering capabilities and it remembers your most recentfilter selections, with an interface that makes it easy to reselectthem.
• Clipboard copy: Select multiple lines in the output window andcopy their contents to the clipboard.
• Highlighting: Highlight debug output that matches yourhighlighting filter, and even customize the highlighting colors.
• Log-to-file: Write debug output to a file as its being captured.
• Printing: Print all or part of captured debug output to aprinter.
• One-file payload:Portmon is now implemented as one file.

The on-line help-file describes all these features, and more, in detail.

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Installation and Use

Simply execute the Portmon program file (portmon.exe) and Portmonwill immediately start capturing debug output. To run Portmon onWindows 95 you must get the WinSock2update from Microsoft. Notethat if you run Portmon on Windows NT/2K portmon.exe must be locatedon a non-network drive and you must have administrative privilege.Menus, hot-keys, or toolbar buttons can be used to clear the window,save the monitored data to a file, search output, change the windowfont, and more. The on-line help describes all of Portmon's features.

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Portmon understands all serial and parallel port I/O control (IOCTLs)commands and will display them along with interesting informationregarding their associated parameters. For read and write requestsPortmon displays the first several dozen bytes of the buffer, using'.' to represent non-printable characters. The Show Hex menu option letsyou toggle between ASCII and raw hex output of buffer data.

How it Works: WinNT

The Portmon GUI is responsible for identifying serial and parallelports. It does so by enumerating the serial ports that are configuredunder HKEY_LOCAL_MACHINEHardwareDeviceMapSerialComm and theparallel ports defined underHKEY_LOCAL_MACHINEHardwareDeviceMapParallel Ports. These keyscontain the mappings between serial and parallel port device names andthe Win32-accessible names.

When you select a port to monitor, Portmon sends a request to itsdevice driver that includes the NT name (e.g. deviceserial0) thatyou are interested in. The driver uses standard filtering APIs to attachits own filter device object to the target device object. First, it usesZwCreateFile to open the target device. Then it translates thehandle it receives back from ZwCreateFile to a device objectpointer. After creating its own filter device object that matches thecharacteristics of the target, the driver callsIoAttachDeviceByPointer to establish the filter. From that point onthe Portmon driver will see all requests aimed at the target device.

Portmon has built-in knowledge of all standard serial and parallelport IOCTLs, which are the primary way that applications and driversconfigure and read status information from ports. The IOCTLs are definedin the DDK file ddksrccommincntddser.h andddksrccommincntddpar.h, and some are documented in the DDK.

How it Works: Windows 95 and 98

On Windows 95 and 98, the Portmon GUI relies on a dynamically loadedVxD to capture serial and parallel activity. The Windows VCOMM (VirtualCommunications) device driver serves as the interface to parallel andserial devices, so applications that access ports indirectly use itsservices. The Portmon VxD uses standard VxD service hooking tointercept all accesses to VCOMM's functions. Like its NT device driver,Portmon's VxD interprets requests to display them in a friendlyformat. On Windows 95 and 98 Portmon monitors all ports so there is noport selection like on NT.

Download Portmon(226 KB)

Free Serial Port Sniffer

Run now from Sysinternals Live.

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

Incoming and outgoing data streams logging

Redirected file can be either split into a bunch of files or can be limited to user-defined size

Possibility to export raw data to a file in Terminal view

Multi-colored commands display in table view

Any software/hardware that works with a serial port can be monitored

Intercept and record all serial input/output control codes (IOCTLs), tracking their full details and parameters

Customizable monitoring session logging (several timestamp formats, different scale of notation, customizable logging string length etc.)

Convenient and flexible monitoring session's management: saving and loading all monitored data, exporting and redirecting to file functions

Monitoring session exporting (HTML, ASCII text, UNICODE text, Exсel CSV) and automatic redirection to file (Serial Port Monitor will automatically append all monitored data to a file in real-time)

Supports copying all recorded data to clipboard

Supports adding data automatically before and after packet to be transmitted

Full duplex mode supported

Control lines status visualized

Unique stream filtering tools with presets

All baudrates supported

Flexible configuration: stopbits, flow control, parity control, data bits, highlighting, etc.

User-friendly flexible interface: the software is designed to provide easy access to serial ports, no programming skills are required

The “Comments” section in the Table view

Quick filters customization in the toolbar

A new data redirection file can be created when monitoring is inactive

The statistics in status bar from first to last highlighted IRP in the Table view. The IRPs in Table view now have the transcript hints from the Line view

Filter data by ports

The data that an application tried to write to port is displayed additionally to actually written data

The automatic scroll for the Terminal view can be disabled

Instead of overwriting the existing data in the file one can continue writing to it with the new command line option

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
11	Tracing all serial input/output control codes
12	Copying all recorded data to clipboard
13	Saving, loading and exporting all monitored data
14	Full duplex mode
15	Unique stream filtering tools with presets
16	The software offers a free trial, which allows using it as a free serial port monitor tool for 14 days

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. 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. 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. 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!

Serial Port Sniffer For Windows

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  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..

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