Virtual Serial Port Tools Version History

Version 5.01.00.0973

Released on 12/28/2021

Release Changes

This is a new major version release. The following features are new or have been significantly improved compared with the previous version:

TCP/IP Ports

This update introduces new type of virtual serial port configuration. Now it is possible to create a virtual serial port that will work in one of the following modes:

Connecting mode
The virtual port device is configured with remote host name or address and TCP port. All data sent to the virtual COM port will be redirected to a given remote TCP/IP endpoint. Responses sent by the remote host are provided as incoming virtual port data.
Listening mode
The virtual port device is configured with a local address and TCP port. It will open a listening TCP/IP socket and wait for incoming network connections. After the connection is established, it will continue to work as described in the previous paragraph.

The user may select the data transfer protocol. RFC2217 and RAW protocols are implemented by the Virtual Serial Port Tools. A pair of virtual TCP/IP serial ports may be used to create a serial bridge, which communicates over TCP/IP network. This adds one more bridge configuration, in addition to previous Local Bridge and Remote Bridge modes.

Sharing of Local COM Ports over TCP/IP Network

This update also includes the new component that is capable of sharing any local COM port (no matter if it is a physical, PnP or virtual serial port) over the TCP/IP network. The same RFC2217 and RAW protocols are supported.

Inclusion of Sharing Server Components

Virtual Serial Port Tools installer now integrates the following components: a virtual serial port driver, API, configuration utilities, documentation and language bindings as well as Remote Serial Port and TCP/IP Serial Port servers. It provides seamless “all-in-one” experience, while supporting separate component installations. This allows, for example, the user to install only sharing servers on designated computers.

Also, a separate “redistributable” version installer is provided.

As before, both Remote Serial Port Server and TCP/IP Serial Port Server components support simple “copy&paste” deployment scenarios.

Configuration Utility Improvements

Configuration utility has been updated with a new visual look, better user experience and improved support for:

Port sharing components integration
Remote Serial Port and TCP/IP Serial Port server configuration utilities are now integrated in the VSPT configuration utility.
High-DPI displays
All user elements, including fonts, graphics, icons and commands are automatically scaled on modern high-DPI and retina displays. Scaling is always smooth and crisp-free on any screen resolution.
Windows 10 and Windows 11 “Dark Mode” and accessibility improvements
Configuration utility automatically recognizes if the user has configured a “dark mode” in his environment and switches to the dark theme. In addition, accessibility high-contrast themes are now fully supported.
Support for various input methods
In addition to mouse, full keyboard and touch support is now provided. User interface items are now automatically adjusted if being used with touch.

IMPORTANT: Upgrading to this release will require the license upgrade as well. Existing users with Lifetime Upgrades will need to download new license file.

Version 4.27.02.0686

Released on 07/02/2021
Latest Release

Release Changes

Bug Fixes

Unable to install the product on Windows 11
This release fixes installer incompatibility with Windows 11.

Version 4.27.01.0682

Released on 05/23/2021

Release Changes

Bug Fixes

Command-line utility is unable to delete devices
A bug that prevented the command-line utility from successfully deleting virtual serial port devices has been fixed.

Version 4.27.00.0675

Released on 04/28/2021

Release Changes

New Features

Security descriptor for pipe-connected ports
It is now possible to specify security descriptor for pipe-connected port.

Bug Fixes

Reported bugs fixed
This release fixes a number of reported and internally discovered bugs.

Version 4.26.01.0669

Released on 04/08/2021

Release Changes

Bug Fixes

Unable to create ports in free edition
A regression in previous build made impossible creation of shared, alias or split ports in free edition.

Version 4.26.00.0665

Released on 04/01/2021

Release Changes

Updated Features

Improved compatibility with Windows 7
VSPT API can now be used on all Windows 7 installations. Previously API calls could fail depending on OS configuration.

Version 4.25.00.0663

Released on 03/19/2021

Release Changes

New Features

Improved support for legacy applications
This release introduces the concept of compatibility flags. Setting various flags will enable non-standard virtual serial port behavior to suit legacy applications. This version adds a flag that disables check for valid special serial port characters.

Bug Fixes

Fixed a crash in API methods
Fixed a crash when calling several API methods.

Version 4.20.00.0651

Released on 02/22/2021

Release Changes

New Features

Serial timeouts override
The user may now specify serial timeout overrides for shared, alias and split ports, in addition to previously supported overrides of baud rate, line parameters and flow control.

Bug Fixes

Incorrect port operation
Shared port did not function properly under some conditions.
Serial timeouts support
This release improves compatibility and proper serial port timeout emulation.

Version 4.19.00.0622

Released on 12/02/2020

Release Changes

Bug Fixes

Reported bugs fixed
This release fixes a number of reported and internally discovered bugs.

Version 4.12.01.0597

Released on 07/17/2020

Release Changes

Bug Fixes

Fixed pipe port operation
A bug that sometimes prevented writing data to the pipe-connected port has been fixed.

Version 4.12.00.0593

Released on 06/14/2020

Release Changes

Updated Features

Pipe-connected ports are powered by new driver
We have ported pipe-connected ports to the new universal virtual serial port driver. In addition, full flow control emulation, serial timeouts as well as wait masks are now supported for these kind of virtual ports. This is a breaking change as the API to create pipe-connected ports has also changed.

Bug Fixes

Fixed ISerialPortLibrary.getPorts API
ISerialPortLibrary.getPorts returned incorrect data. This has been fixed.
Fixed memory leaks
This release also fixes a number of memory leaks in library.

Version 4.10.00.0557

Released on 02/03/2020

Release Changes

Updated Features

Local bridges are powered by new driver
We have ported local bridges to the new universal virtual serial port driver. Remote bridges are still currently powered by a legacy driver and will be migrated in the future releases.

Version 4.03.00.0498

Released on 12/04/2019

Release Changes

Bug Fixes

Failure to handle Purge requests
Shared and splitted serial ports failed to properly handle serial purge requests.
Read timeout processing failed
Read requests that ended with a timeout were incorrectly handled.

Version 4.02.00.0482

Released on 09/19/2019

Release Changes

Bug Fixes

Reported bugs fixed
This release fixes a number of reported and internally discovered bugs.

Version 4.01.00.0467

Released on 09/10/2019
First Release
No changes are available for this release.