A serial port interface ActiveX component for Excel, Access and Visual Basic. - Provides asynchronous I/O, serial port state change notifications. There is no need to poll the component for incoming data. The user needs to provide an event handler procedure to receive incoming data. - Unlimited data buffering capability for slow VB applications. - Simple access to DSR and CTS pin states via component properties. - Programmatic DTR/RTS control via component properties. - Asynchronous data transmission. The user program could send some big data block to the control and it will be transferred through the serial port in background. - Works with physical RS232 ports and USB-to-Serial bridges. Useful with USB bar code scanners with serial port emulation. - Automatic reconnection with USB-to-RS232 adapters upon device attachment.