Com Port Tool

Download PortQryUI.exe, an add on User Interface utility for PortQry. All Port Tools are ground between centers to ensure absolute concentricity. They are made from heat-treated alloy steel with brazed carbide inserts. They are designed to enlarge a pre-drilled hole and easily produce a complex form. Port Tools can be used for both lathe and mill applications.

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rs232 communication analyzer

rs232 data acquisition system

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Com Port Test Tool

  1. Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
  2. ComPortMan is a Windows service that gives control over Windows' COM port assignment for COM ports. Running as service makes it independent of the logged on user's privileges, so there is no need to give the users the privilege to change COM ports. You can define new default COM port numbers by several criteria.
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rs232 sniffer and analyzer for Windows

free serial port analyzing software

rs232 port data capture utility

External Content

monitor & analyze ip connections

monitor & analyze pc serial ports

edit your hex data and binary files

Browse HHD Software Free Serial Port Monitor Main Menu:
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HHD Software Free Serial Port Monitor Site Path:

Download new version of Free Serial Protocol Analyzer here:

It supports Windows XP, Vista, 7, 8, 8.1 32 and 64 bit.

There is also Free USB Protocol Analyzer ( and Free Network Protocol Analyzer (

Monitor and Analyze Your Serial Ports and Hardware Devices

Free Serial Port Monitor allows you to intercept, display and analyze all data exchanged between the Windows application and the serial device. It can be successfully used in application development, device driver or serial hardware development and offers the powerful platform for effective coding, testing and optimization.

This product, which is developed by professionals in the area of serial port communications, will help you to save time, money and precious nerves, as it already helped our partners.

We will take care of monotonic digging in protocols and data flows. Concentrate your brilliant skills on your project, do your job with pleasure!


This is a completely software solution, no additional hardware is required.

More HHD Software Products

USB Monitor (DMS)

Accurate Network Monitor

Serial Port Monitoring Control

Serial Monitor (DMS)


Hex Editor Neo

Free Hex Editor Neo


Hex Editor Neo 4.81 has been released today!

It introduces full operation history tree window, new customization system as well as a lot of other new features and updates.

Com Port Toolkit


Hex Editor Neo 4.75 has been released today!

It introduces revised operation history, new customization and display options and improved performance. It also fixes reported bugs and crashes.


Hex Editor Neo 4.73 has been released today!

Com Port Toolkit

It introduces the full support for Windows 7 Beta, new file formats for structure viewer and improved performance and reliability.


Hex Editor Neo 4.72 has been released today!

It introduces an x64 disassembler.


I just downloaded your free RS232 monitor and had my clients problem solved within an hour. Brilliant!
Thank you.

You can view the detailed serial port information by choosing the Tools Serial Port Information menu option.

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