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Virtual Serial Port Driver
Fully emulate real serial port create virtual COM port pairs

Virtual Serial Port Driver creates virtual serial ports and connects them in pairs via virtual null modem cable. Applications on both ends of the pair will be able to exchange data in such a way, that everything written to the first port will appear in the second one and backwards.

All virtual serial ports work and behave exactly like real ones, emulating all their settings. You can create as many virtual port pairs as you want, so there will be no serial ports shortage and no additional hardware crowding your desk.

Moreover, Eltima virtual serial port technology can be fully integrated into your own software (OEM license).

Virtual Serial Port Driver main features

  • Create any number of virtual COM ports

    Virtual Serial Port Driver provides you with the ability to create an unlimited number of virtual serial ports. Created ports are located in "ports" group in Device Manager, which means that they will be visible and easily recognized by all software and hardware you install. You will be able to set which application has access to the defined port. No real hardware serial ports are occupied.
  • Complete real ports settings emulation

    Virtual ports, created by Virtual Serial Port Driver, work exactly like real ones. They emulate all real serial ports settings and provide strict baudrate emulation and full HandFlow control support. Additionally, you can easily emulate a serial line break. Moreover, VSPD uses advanced Windows kernel driver technology, which ensures WDM, WMI, Power Management, PnP, etc. support. Virtual Serial Port Driver is fully compatible with API COM and supports all Windows messages.
  • Manage all signal lines

    Virtual serial ports created with Virtual Serial Ports Driver emulate and support all standard hardware signal lines (DTR/DSR, RTS/CTS, RING, ERROR, DCD, etc.). As in real null modem connection, DTR of the local port is connected to DSR and DCD of the remote port, and RTS of the local port is connected to CTS of the remote port. Moreover, you can choose loopback pinout or create custom one depending on 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

Any number of virtual serial ports pairs can be created
Virtual serial ports are absolutely the same copies of real ones - applications won't see the difference between real and virtual serial ports
Virtual serial ports can be controlled directly from your own application via Dynamic Link Library supplied with VSPD (for OEM License owners)
Link between virtual serial ports is much faster than real null-modem cable connection and solely depends on your processor speed (average transfer speed is about 5.5 Mbytes/sec)
Real serial ports are not occupied - you can even have no real ports in system at all
Possibility to create ports for the current user session only. Allows RDP users to create port with the same name (e.g. COM1) in each user session.
You can enable automatic update of ports’ list, thus you can see pairs created in other user sessions
Instantaneous ports creation lets working with them even before PnP manager detects the newly added ports
Strict baudrate emulation
Ports can be deleted even if they are open by other applications

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

Let's get started

Virtual Serial Port Driver for Windows
Demo version limitations
14-day fully-functional trial
System Requirements
Windows 2000, Windows (32-bit and 64-bit): XP/2003/2008/ Vista/7/8/10, Windows Server 2012
Latest Update
Version 8.0.412 (15th Jul, 2015) Release notes