1. HHD Software Virtual Serial Ports is a software package that allows you to create virtual COM ports. Windows 10 (32 and 64 bit) Windows Server 2016. On 64-bit operating systems, both 64-bit and 32-bit ActiveX control libraries are installed and registered, allowing both 64-bit and 32-bit client code to create and manage virtual COM ports.
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I have installed, apparently successfully, com0com v2.2.2.0 on a 64bit Windows 7 machine.

I run the command utility, like this:

Download and Install Null-modem emulator (com0com) for windows 10/8/7/Vista/XP software from official page. The Null-modem emulator allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.

Note: logged as 'in use' is NOT an error message?

How to make music beats. Then I try to open COM8 like this

This fails with

I have tried both 'COM8' and '.COM8'.

Note that the exact same call to CreateFileA works perfectly on a 'real' COM port.

Q: Can someone tell me what the problem is?

A: On windows 7 64 bit you have to enable testing of unsigned drivers.

• Run a command prompt as administrator. Names of beyblades. ( It is not enough just to run from an account with admin privileges. See here for details of how to do this. )

• Hazmat certification requirements. Type in the command bcdedit -set TESTSIGNING ON

• reboot. ( Windows will place a 'test Mode' note on the bottom right of the desktop )

For Windows 8 this method does not work satisfactorily or easily. Here is some discussion of the issues and workarounds.

Alternatively you might want to try a signed version - I have NOT tried this myself.

2 Answers

Here are my points:

• Microsoft requires 64-bit drivers to be signed.
• com0com.sys (64bit) is a mere unsigned kernel-mode driver.

SoftWx has written an interesting tutorial on installing it on a 64 bit Windows 7 machine. You can fetch it here.

In case anyone is referencing this, and interested in this topic, the 2.2.2.0 version of com0com is signed for 64-bit Windows. This removes the need to jump through the hoops of putting Windows in 'test' mode.

Not the answer you're looking for? Browse other questions tagged winapicom0com or ask your own question.

Posted by3 years ago

How do *you* split/share serial ports on Win10?

Background - I have a single 'real' COM port that I use for rig control. I have multiple apps on the PC that each want exclusive access to a single com port to talk to that rig.

I've used com0com for this before, but Windows 10 doesn't play nice. I have installed 2.2.2.0 -- the last unsigned version -- but the COM ports I create with it don't work. The only way I've been able to get it to work is by booting Windows 10 into recovery mode, disabling driver signing, and installing the latest 3.x version of com0com. Great, except the driver stops working on reboot because driver signing goes back into effect.

I know there's commercial software out there to do this, but I'd really prefer not to shell out dollars unless that's the only technical solution.

So Reddit, what do you use for this?