ActiveXperts Serial Port Component

ActiveXperts Serial Port Component is a Windows ActiveX/COM component offering serial port, asynchronous communications. Includes samples for Visual Studio .NET (C#, VB), VB, VC++, ASP.NET and more.

NOTE: All licenses are perpetual (licenses will NEVER expire). No annual fee is required. Pricing includes ONE YEAR maintenance for free. Maintenance covers unlimited support and right to upgrade to a newer version – if any. A maintenance renewal is offered automatically after one year.



Adding serial communications requires specialized knowledge that might be outside an individual programmer’s expertise. For years, developers have relied upon the power and reliability of the ActiveXperts Serial Port Component serial communications control.

  • Easy to use API
  • Control devices over a serial port
  • Single DLL, 64-bit and 32-bit
  • Samples available in C#, VB, ASP.NET, HTML, PHP, Javascript, Delphi and more


ActivExperts Software

ActiveXperts is a leading provider of Windows networking- and communication software. Its most widely known products are the ActiveXperts Network Monitor and ActiveXperts SMS Messaging Server. ActiveXperts sells its software products worldwide through a network of resellers and online through the internet, and provides software development and consulting services to companies all over the world.

Additional information

License (Perpetual)

ActiveXperts Serial Port Component Standard License, ActiveXperts Serial Port Component Professional License, ActiveXperts Serial Port Component Distribution License

Supported Operating Systems

ActiveXperts Network Component runs on all major Windows platforms. The component is just one DLL: AxSerial64.dll. For 32-bit platforms, AxSerial32.dll is also included.

The component runs on the following Windows operating systems:

  • Server platforms: Windows 2022, Windows 2019, Windows 2016, Windows 2012 R2, Windows 2012, Windows 2008 R2, Windows 2008, Windows 2003
  • Desktop platforms: Windows 11, Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP


Use ActiveXperts Serial Port Component for different purposes:

  • To control manufacturing machines via the serial port;
  • To configure network devices (like print-servers, routers) via the serial port;
  • To control a modem, connected to the serial/USB port or Bluetooth;
  • To transfer files through a null modem cable;
  • Any other scenario where serial communications is involved.


ActiveXperts Serial Port Component features the following:

  • Direct COM ports supported (e.g.: ‘COM2’);
  • Windows Telephony Devices supported (e.g.: ‘Standard 9600 bps Modem’);
  • Support for RS-232, RS422 and RS485;
  • Up to 256 ports opened simultaneously;
  • Thread-safe to allow the component in multi-threading environments (samples included);
  • Support for Hayes compatible modems, connected via a serial port, USB or Bluetooth;
  • Support for Virtual COM ports (i.e. COM ports redirected through the network);
  • Hardware flow control (RTS/CTS, DTR/DSR);
  • Software flow control (XON/XOFF);
  • Support for any baudrate, parity, stopbits;
  • Full buffered data transfer;
  • Text and Binary data transfer;
  • Advanced logging.


ActiveXperts Serial Port Component includes samples for many development tools, including:

Visual Basic .NET – Visual C# .NET – ASP .NET VB – ASP .NET CSharp – Visual C++ – Visual Basic 6 – ASP 2.x – PHP – HTML – VBScript – PowerShell – Delphi

This code snippet illustrates how to use ActiveXperts Network Component. It sends out an SMS messaging using a GSM modem with SIM card inserted. For full samples, go to

Set objComport = CreateObject("AxSerial.Comport") ' Create a new Comport instance

objComport.Device              = "COM1"           ' Use a COM port directly  
objComport.BaudRate            = 56000            ' Set baudrate (default value: 9600)
objComport.HardwareFlowControl = True             ' Set Hardware Flow Control
objComport.SoftwareFlowControl = False            ' Set Software Flow Control
objComport.Open                                   ' Open the port
Wscript.Echo "Open, result: " & objComport.LastError
If( objComport.LastError <> 0 ) Then
End If

objComport.WriteString( "at&f" )                  ' Write command
str = objComport.ReadString
WScript.Echo "Received: [" & str & "]"            ' Read the response

objComport.Close                                  ' Close the port


The core of ActiveXperts Serial Port Component is a ActiveX/COM DLL component is available as a 64-bit DLL and a 32-bit DLL.

  • AxSerial64.dll – the ActiveX/COM component for 64-bit platforms
  • AxSerial32.dll – the ActiveX/COM component for 32-bit platforms

Distribution is easy: copy the DLL(s) to the target platform and register the self-registering DLL using the REGSVR32.EXE Windows command. Click here for more information.

Licensing Options

All ActiveXperts licenses are are perpetual, which means that a license is paid only once and does not need to be renewed annually. It allows you to use the software for as long you continue to comply with the terms of the license agreement.
First year of Maintenance is included in purchase of a license. Maintenance entitles customers to use ActiveXperts’s technical support services, and to receive all product upgrades, free of charge, during a specified Agreement duration.


AX003-0010 – Standard License

The Standard License allows you to:

  • Use the software on one computer (not a web server) in your organization only; It is not allowed to use the software outside your organization or distribute the software as part of your own software; It is not allowed to use the component on a web server.
  • Use all functions, except ReadBytes and WriteBytes.


AX003-0012 – Professional License

The Professional License allows you to:

  • Use the software on an unlimited number of computers (workstation/server/web server) in your organization only; It is not allowed to use the software outside your organization or distribute the software as part of your own software;
  • Use all functions, without limitations.


AX003-0020 – Distribution License

The Distribution License allows you to:

  • Use the software on an unlimited number of computers (workstations/servers) in your organization;
  • Use all functions, without limitations;
  • Rent, lease or distribute an unlimited number of licenses of the software outside your organization bundled with an application.

You adhere to the following terms:

  • You may not resell, rent, lease or distribute the software alone. The software must be distributed as a component of an application and bundled with an application or with the application’s installation files. The software may only be used as part of, and in connection with, the bundled application.
  • You may not resell, rent, lease or distribute Software in any way that would compete with ActiveXperts Software B.V.
  • All sample code provided by ActiveXperts Software B.V. that is distributed with your application, may be modified and distributed to your customers.
  • A valid copyright notice must be provided within the user documentation, start-up screen or in the help-about section of your application that specifies ActiveXperts Software B.V. as the provider of the software bundled with your application, for example: your application name contains a network communication component licensed from ActiveXperts Software B.V. This component may only be used as part of and in connection with your application name.
  • You agree to indemnify, hold harmless, and defend ActiveXperts Software B.V. and its suppliers from and against any and all claims or lawsuits including attorney’s fees that arise or result from the use or distribution of your bundled application.


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