COM Sniffer – Advanced Serial Port Analyzer

COM Sniffer is one of the most powerful and comprehensive modules integrated into SerialTool, designed for professionals who need a high-level solution to monitor, log, and analyze in real time all serial traffic (RS232, RS422, RS485) passing through the COM ports of their Windows system.

This solution is ideal for software and firmware developers, as well as technicians and system integrators working with industrial, medical, CNC, and embedded devices. Thanks to its modern, compact, and intuitive interface, COM Sniffer is also accessible to hobbyists and users with limited experience in serial communication.

Serial COM Sniffer Main Page

COM Sniffer – Main Screen

Why choose COM Sniffer?

  • Simultaneous monitoring of multiple COM ports, even those in use by third-party applications.
  • Continuous file logging for detailed analysis and 24/7 diagnostics.
  • Automatic baud rate detection.
  • Real-time decoding with hex dump and ASCII views.
  • Millisecond-level timestamp accuracy for every captured event.
  • Zero interference with the applications using the monitored serial ports.
  • Fully customizable interface, optimized even for mini-PCs and embedded systems.

Perfect for

  • Debugging and analysis of proprietary or third-party applications.
  • Authorized reverse engineering of serial protocols.
  • Validation and testing of legacy devices, CNC machines, modems, medical equipment, and industrial automation systems.
  • Ensuring reliable communication between host software and embedded firmware.
Serial COM Sniffer IOCTLs

COM Sniffer – IOCTL Panel

Complete and Modular Interface

Every aspect is divided into dedicated panels: Session Log, Read/Write, Binary Dump, IO Controls, and Debug. You can navigate, filter, export, and isolate the data you’re interested in with just a few clicks.

Session Log and Dump Layout

COM Sniffer – Session Log and DUMP View

Continuous Logging with Smart RAM Management

You can configure FIFO limits for each log type (Session Log, Read/Write, IOCTL, Dump), ensuring the application doesn’t consume excessive memory. This makes COM Sniffer perfect for 24/7 monitoring on embedded systems or industrial servers.

Logging Configuration

COM Sniffer – Logging Options

Professional Architecture Based on Kernel Driver

COM Sniffer is built on a custom-developed WDF kernel-mode driver, operating at the lowest level of the Windows OS. This enables:

  • True, transparent interception of all commands, including those not visible from user-mode.
  • High performance with zero bottlenecks.
  • Maximum reliability in mission-critical environments.

Kernel driver development is complex and specialized. Our team has invested hundreds of hours in engineering, testing, and Microsoft driver certification to deliver a robust, professional-grade solution.

Why COM Sniffer

COM Sniffer is the ultimate solution for serial port monitoring on Windows. It's not just a sniffer — it's a full-featured professional serial protocol analyzer, suitable for development, diagnostics, and production environments.

Whether you're developing embedded firmware, testing an RS232 interface, or debugging a legacy application, COM Sniffer provides all the tools you need to gain full control over your serial communication.