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Virtual RS485 Port Driver
Create virtual COM ports

Virtual RS485 Port Driver is a software solution that allows you to emulate virtual RS485 ports and pair them. Null modem emulator connecting two serial ports forms a virtual bridge that allows two applications on its opposite ends talk to each other. Data that goes from one app travels to the other app immediately.

Virtual RS485 port emulates all parameters of a real hardware port in such a way that the system cannot see the difference between the two. Besides eliminating clutter on your desk virtual RS485 null modem offers you another advantage – it works much faster than a real RS485 null modem. OEM license allows you to include this RS485 null modem emulator into your application. It means you can create virtual RS485 ports directly from your software.

Virtual RS485 Serial Port Driver enables you to:

  • Create any number of virtual ports

    The software is capable of creating an unlimited number of ports; all of them are displayed in the system’s Device Manager so you can connect to them whenever required. Your real hardware ports – if you’ve got any on your machine –are not occupied. Virtual ports can be given any names, including those of the real ports. It is possible to restrict access to a virtual port to only particular applications.
  • Emulate all real ports parameters

    Virtual ports will behave exactly like real hardware ports thanks to Virtual RS485 port driver’s ability to simulate all required parameters - Baud rate, data bits, parity bits, stop bits, etc. The application is capable of simulating a serial line break and compatible with API COM. Advanced Windows kernel driver technology supports WDM, WMI, Power Management, PnP, Windows messages, etc.
  • Emulate all signal lines

    Apart from RS485 port emulation, the application supports all standard hardware signal lines, including DTR/DSR, RTS/CTS, RING, ERROR, DCD, etc. Virtual null modem cable pairs DTR and DCD, RTS and CTS lines – a local port to a remote port respectively. There is a loopback pinout or you can set it up according to your hardware configuration.

Corporate, OEM & Source code

Whether you're looking at redistributing our Virtual Serial Port Driver technology as a part of your product or considering Virtual Serial Port Driver software for an enterprise-wide deployment, we offer flexible and affordable corporate solutions designed to meet your needs.

OEM License

Virtual Serial Port Driver Inside Your App

Purchasing the OEM license you get:

  • OEM documentation on how to work with our driver directly
  • Example for creating a class which demonstrates the possibility to create the ports like in VSPD (visible and invisible ports)
  • vspdctl.DLL - wrapper for a driver for manipulations with virtual serial ports on a higher level
  • Supported IDEs

OEM For Developers
Sign up for the API evaluation program and integrate it into your product.

Source Code License

Ordering Source Code license for Virtual Serial Port Driver you receive all extensively commented programming source code of the driver (GUI sources are not included). In addition, we provide technical and information support by email, IMs and phone, and high-end consulting services. Our leading developers will help you implement Source codes and understand the advanced part of the product.

Site Licensing

Unlimited Site License grants you the right to install and utilize Virtual Serial Port Driver application with GUI on unlimited number of computers by all workers of your company worldwide. It is the ideal solution if your company has representation offices in the different parts of the world.

If you know the certain number of computers to be equipped with VSPD you may consider obtaining Limited Site License. The advantage of Site Licensing comparing to multiple Single licenses is one license key for all company computers.

Full features list

Create an unlimited number of virtual serial ports with the help of RS485 software
Emulate all parameters in such a way that your system will not see any difference between physical and virtual ports
Control virtual serial ports from your own app via Dynamic Link Library supplied with VSPD (for OEM License owners)
Make most of the fast RS485 null modem cable connecting two ports, its average speed reaches around 5 Mb/sec. The only limitation here is the capacity of your processor
Free hardware serial ports – in case you have any
Limit use of ports to the current session, if required. RDP users can create ports under the same name (e.g. COM1) in each of the sessions
Enable automatic update of the list of ports so you’ll see pairs from other sessions
Access ports immediately – even before PnP manager can detect newly created ports
Emulate strict baudrate
Delete ports even if they are being used by apps

What customers say

  • We are using VSPD for testing out Geographic Information System software connectivity with a virtual GPS (software simulation). The GPS emulator is simulating the output we normally receive from a GPS navigator.
    Bjørn Krangnes

Overall rating 4.9
based on 97 reviews

Let's get started

Virtual Serial Port Driver for Windows
Demo version limitations
• 14-day fully-functional trial
System Requirements
Windows (32-bit and 64-bit): XP/2003/2008/ Vista/7/8/10, Windows Server 2012, Windows Server 2016
Latest Update
Version 9.0.567 (5th Aug, 2017) Release notes