GeezerVison is showing sourceforge.net — Null-modem emulator Reviews - 2026
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Featured Reviews
Highest Rated
5 out of 5 stars
If you have trouble with Windows signed drivers, use version 2.2.2.0
sfjeoff
vs
Lowest Rated
1 out of 5 stars
This could be more difficult to use, but that would be difficult to do. "com2tcp" was not in the Windows download and after spending more time than it would have cost to purchase a commercial product, I finally located the file. Then I had to use two different windows and two different virtual pairs of devices to create two virtual serial ports. Finally, my application, which is based on RXTXcomm, doesn't recognize "CNCA0" as a device, so I had to use "\\.\CNCA0".
I'm sure there is an easier way (I hope) to do all this, but I'm not going to stick around to figure it out. Sorry for the harsh review -- com0com is not ready for prime time.
jfhaugh
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alexgrig
Posted 2026-07-17
4 out of 5 stars
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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.
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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.
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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
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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.
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shraibikus
Posted 2020-08-24
4 out of 5 stars
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spicos
Posted 2019-04-09
5 out of 5 stars
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geraldschulze
Posted 2018-07-11
5 out of 5 stars
Sorry my poor English, this project is very useful for me to debug because I work with ancient devices that require COM port interface only.
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maisonsmd
Posted 2018-04-17
5 out of 5 stars
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fc234
Posted 2017-03-04
5 out of 5 stars
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daflame
Posted 2016-11-18
4 out of 5 stars
For those having trouble gettings the driver to work, you should make sure to install the signed version. Works great. Also, the COM ports do not show up in the Ports (COM & LPT) in device manager. They show up in a new device category for com0com and you can't set the port settings as you can on regular ports. Whether that is good or bad I leave to your own judgement.
3 users found this review helpful.
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alexxgreen
Posted 2016-10-03
3 out of 5 stars
I downloaded several programs for emulation virtual null modems, also com0com. But the best for me is Null Modem Emulator by Eltima - this software is fully baked.
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btb4198
Posted 2015-06-20
1 out of 5 stars
It does not work!!!
In Device Manager it does not show up in Ports(COM& LPT)
and I have tried it on a few computers now
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ethanalan
Posted 2015-02-24
5 out of 5 stars
For those of you having trouble with driver signing in Windows 8/8.1, do a google search for:
windows 8 disable driver signature enforcement
It should be the first link listed at learn.sparkfun.com
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gunboy
Posted 2015-01-06
5 out of 5 stars
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antontomazic
Posted 2014-12-18
5 out of 5 stars
helo
I have two applications that are on the virtual port: com11 and com12. How do I set com0com or hub4com to the application on a virtual port to communicate with the physical port com5 where hadrver card with relays.
Possible?
Thanks
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sfjeoff
Posted 2014-05-30
5 out of 5 stars
If you have trouble with Windows signed drivers, use version 2.2.2.0
3 users found this review helpful.
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dwildbore
Edited 2014-04-04
1 out of 5 stars
Just like Martin I can't use it because the driver isn't signed. Great shame I've heard nothing but good about it.
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ajalibu
Posted 2014-03-20
5 out of 5 stars
Very good tool! I've used it with com2tcp to redirect com from another pc. Works like a charm
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thevirus1986
Posted 2014-02-17
4 out of 5 stars
I found bug :) There is problem when I'm opening one of these virtual port with my app (.NET, VS2008). While second port is open is ok, but when it is closed, main app is 'frozen'. It's 'defrost' in the same time when i opened second port (no data revivied). System is Win7 pro x64
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martinyarwood
Posted 2013-11-05
2 out of 5 stars
Lack of driver signing means I can't use it, I guess that's one way for microsoft to shut the door on open source. Don't let them do it Vyacheslav get it signed. Thanks for the project anyhow.
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chikatambun
Posted 2013-07-02
4 out of 5 stars
Good work, the security matter would be omitted on x64 system
you can enable/disable testing mode
Keep up and raise :-D
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thelmadavis
Posted 2013-06-22
5 out of 5 stars
1 user found this review helpful.
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scottsimpson2
Posted 2013-06-09
5 out of 5 stars
Nice work ! Great project.
1 user found this review helpful.
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anitahulsey
Posted 2013-06-07
5 out of 5 stars
1 user found this review helpful.
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