Serial Port Monitor ActiveX is a powerful and unique ActiveX Control that can be easily embedded into your application to sniff (fully monitor) any serial port in a system. This component offers a wide range of events, properties and methods to check the state of the serial port, intercept all signal line events (Ring, RTS, DCD, DTR, RTS, etc.) and control functions (Handflow, Baudrate, Timeouts). Additionally, it provides low-level access to serial port via standard IRP major functions and IOCTL requests.