Virtual Null Modem prices with the code applied
Virtual Null Modem Lite
Virtual Null Modem Standard
Virtual Null Modem Professional
Applying the code at checkout
- Copy the Virtual Null Modem coupon code from the box above. It takes you to store.payproglobal.com, the authorized reseller AGG Software uses for online orders.
- Paste WinningPC into the discount or coupon field and apply it.
- Confirm the total dropped before paying and complete the order.
- Your key arrives by email.
How well does Virtual Null Modem work?
The part that earns its keep is how little ceremony it involves. Ports appear and disappear in real time, no reboot, and the paired ports are fully independent of any hardware you already have, so you can run the whole thing on a laptop with zero physical COM ports. Two details matter more than the marketing does.
First, you pick the null-modem wiring layout from a drop-down, including partial and full handshaking, which is the difference between software that thinks it has flow control and software that actually gets it. Second, the Virtual Null Modem Professional edition can inject data errors at anything from 0 to 100%, and if you write serial code, deliberately corrupting the line is how you find out whether your error handling is real. The honest limitation: the current build is 2.6.2 (913) from November 2021. It works, but nothing about it looks like 2026.
Key features
- Create and remove virtual port pairs while Windows is running, with no reboot and no spare hardware needed.
- Five selectable null-modem schematics, from no handshaking through to full handshaking, so the emulated cable matches what your application expects.
- Adjustable data corruption on outgoing traffic (Professional), for testing how your code behaves on a bad line.
- Command-line control (
-p,-u,-iaand friends) so ports can be created and torn down from a build script or a test harness. - Unlimited port pairs on Professional; Standard caps at three, Lite at one.
What we think
Frequently Asked Questions
Is the Virtual Null Modem coupon code still working?
Yes. Code WinningPC gives up to 27% off, confirmed at live checkout in Sep 2026. You can check the latest AGG Software coupon code here.
What’s the cheapest way to buy Virtual Null Modem?
Lite at $44.10 with the code. It is limited to a single virtual port pair and drops the line control register emulation, so it suits one application talking to one other application and not much beyond that.
Does the license expire?
No. The license is perpetual, so you keep using the version you own forever. What expires is the update window: new licenses include 12 months of product updates, and after that you can carry on running the last version you were entitled to. Renewing for another 12 months costs 50% of the equivalent new license.
How many computers can I use one license on?
One. AGG Software licenses per computer, so one license covers a single PC or server, not a network or a site.
Is there a free alternative to Virtual Null Modem?
Yes, com0com. It is an open-source, GPL-licensed kernel-mode driver for Windows that creates unlimited virtual COM port pairs, and it costs nothing. The trade-off is a rougher setup process and no vendor support, and some users have run into driver-signing issues on newer Windows versions.
Why doesn’t my virtual port appear under “Ports (COM and LPT)”?
Because it isn’t supposed to. Ports created by this program show up in Device Manager under their own group called Virtual Serial Port. If a port does appear but carries an exclamation mark, you have most likely picked a COM number that already exists in the system. Try creating it as COM20 instead.
What you need to run it
| Operating system | Windows 2000 through Windows 11, including Server editions, x86 and x64. Windows 9x, Me and NT are not supported |
| Processor | Any Intel x86-compatible CPU; 1 GHz or faster recommended |
| Memory | 256 MB recommended |
| Free disk space | About 5 MB, plus room for log files |
| Permissions | Administrator account required (the software installs a kernel-mode driver) |
| Latest version | 2.6.2 build 913, released 12 November 2021 |
| Download size | 4.2 MB (EXE) / 4.1 MB (ZIP) |
