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GeezerVison is showing sourceforge.net — Null-modem emulator

The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. The HUB for communications (hub4com) allows to receive data and signals from one COM or TCP port, modify and send it to a number of other COM or TCP ports and vice versa.

Features

com0com: baud rate emulation
com0com: pinouts customization
com0com: noised line emulation
com0com: paired port settings monitoring (baud rate, data bits, stop bits, parity)
com0com: hiding 'unavailable' ports from user
hup4com: spliting data from one serial device into several virtual serial ports
hup4com: redirecting serial to TCP/IP and TCP/IP to serial
hup4com: RFC2217 - Telnet Com Port Control Option (client and server)

Project Samples

Project Activity

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License

GNU General Public License version 2.0 (GPLv2)

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alexgrig Posted 2026-07-17

4 out of 5 stars

I think it usefeul
sommerleo Posted 2026-04-25

5 out of 5 stars

Simple and did exactly what i needed, fully compatible with my windows version (Windows 11 Home Single Language), will test further with my application.
darkmillaengine Edited 2025-04-09

3 out of 5 stars

This software is awesome for managing serial ports on Windows. I use it in combination with SerialTool (www.serialtool.com) and it works great!! EDIT: the latest version of SerialTool supports Virtual COM Port creation as well.
daniel1963 Posted 2023-01-18

5 out of 5 stars

Serial connection between virtual machines without the need for hardware. One of the most effective programs I have
avancuren Posted 2021-08-03

5 out of 5 stars

This is simple, solid and did EXACTLY what I needed. This is one of the little tools that I keep around forever to pull out when I need just that.

Additional Project Details

Operating Systems

Windows, Windows Server

Languages

English

Intended Audience

Advanced End Users, Developers, Testers

User Interface

Command-line, Win32 (MS Windows)

Programming Language

C, C++

Related Categories

C++ Serial Software, C++ Telnet Software, C++ Emulators, C Serial Software, C Telnet Software, C Emulators

Registered

2005-01-24

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