GeezerVison

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

See All Activity >

License

GNU General Public License version 2.0 (GPLv2)

Follow Null-modem emulator

Null-modem emulator Web Site

Other Useful Business Software

99.99% Uptime for MySQL and PostgreSQL Databases

Sub-second maintenance. 2x read/write performance. Built-in vector search for AI apps.

Cloud SQL Enterprise Plus delivers near-zero downtime with 35 days of point-in-time recovery. Supports MySQL, PostgreSQL, and SQL Server.

Start Free

Rate This Project

User Ratings

4.4 out of 5 stars

★★★★★

★★★★

★★★

★★

★

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5

features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5

design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5

support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5

User Reviews

Filter Reviews:

All

All
★★★★★
★★★★
★★★
★★
★

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

Similar Business Software

Files.com

Files.com is a cloud-native Managed File Transfer (MFT) platform that unifies file transfers, sharing, and automation across any cloud, protocol, or partner. It connects 50+ storage systems — including Amazon S3, Azure, Google Drive, SharePoint, Dropbox, and Box — presenting them as a single...

See Software for Files.com
SerialTool

SerialTool is a professional Serial Port Software to quickly and easily communicate with your PC Serial Port. SerialTool is the result of years of development and implementation of functionalities in the use of the COM port. Many features have been designed to facilitate embedded development...

See Software for SerialTool
Shift

Shift is a fully customizable browser where you can drag and drop apps, bars, and controls to create a central hub that adapts to however you work. Integrate 1,500+ apps, swap instantly between Spaces for work, side hustles or personal browsing, and stay logged into multiple accounts at once....

See Software for Shift
Kasm Workspaces

Kasm Workspaces streams your workplace environment directly to your web browser…on any device and from any location. Kasm uses our high-performance streaming and secure isolation technology to provide web-native Desktop as a Service (DaaS), application streaming, and secure/private web...

See Software for Kasm Workspaces
Adobe Acrobat

Adobe Acrobat Studio is a leading enterprise document platform built to scale for global teams — delivering AI-powered document intelligence, trusted PDF tools, and on-brand content creation in one secure solution. Core capabilities include PDF creation, editing, conversion, annotation,...

See Software for Adobe Acrobat
Secure Eraser

What is deleted from the hard drive is far from gone. As long as the data is not overwritten, anyone can make it visible again at any time. This is particularly problematic when a computer is resold or given away. Secure Eraser utilizes recognized methods for data deletion and overwrites...

See Software for Secure Eraser

Report inappropriate content