Serial Communication SDK to add serial communications to your project. Communicate with a modem, scanner, printer, weight indicator or any other serial port device. The component features full com port control, binary and ASCII data transfer, RS-232 and RS-485 standards, TAPI and ISDN modem support.
Used it in your ASP, ASP.NET, Visual Basic, Visual Basic .NET, Visual C++, Visual C# .NET, JavaScript and VBScript projects. Runs on Windows 98, Windows ME, Windows NT 4, Windows 2000, Windows XP and Windows 2003. Also runs on the Windows .NET framework.
Easy to distribute and install, especially compared to MSComm.
Visit http://www.activexperts.com/activcomport to view online samples.

ActiveComport features the following:

Direct COM ports supported (like 'COM2');
Windows Telephony Devices supported (like 'Standard 9600 bps Modem');
Support for RS-232, RS422 and RS485;
Up to 256 ports opened simultaneously;
Thread-safe to allow the toolkit in multi-threading environments (multi-threading samples included);
Support for Hayes compatible modems, connected via a serial port, USB or Bluetooth;
Support for GSM/GPRS modems (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 flowcontrol (XON/XOFF);
Support for any baudrate;
Ability to set baudrates, parity, stopbits;
Full buffered data transfer;
Text and Binary data transfer;
Advanced logging.