1)   ActiveComport Serial Port Toolkit 3.0
Serial COM port Communication SDK to add serial communications to your project. Communicate with a modem, scanner, printer or any other serial port device. Samples included for ASP, VB, VB .NET, VC++, VC# .NET, JavaScript, PHP, Delphi and VBScript.

 2)   ActiveComport Serial Port Development Kit 2.1
Serial COM port Communication SDK to add serial communications to your project. Communicate with a modem, scanner, printer or any other serial port device. Samples included for ASP, VB, VB .NET, VC++, VC# .NET, JavaScript and VBScript