Serial Port Monitor ActiveX Control provides a set of events to notify about the changes in state and data being sent/received via the port which is monitored by the ActiveX Control:
| Event | Brief Description |
| OnBaudRate | The baud rate change was detected |
| OnCTS | The CTS (clear-to-send) signal changed state |
| OnDCD | The RLSD (receive-line-signal-detect) signal changed state |
| OnDSR | The DSR (data-set-ready) signal changed state |
| OnDTR | The DTR (data-terminal-ready) signal changing state |
| OnHandFlow | The flow control change detected |
| OnLineControl | The line control change detected |
| OnOpenClose | The port Open or Close operation detected |
| OnRead | Data is being read from the port (VARIANT analog of OnReadData) |
| OnRing | A ring indicator was detected |
| OnRTS | RTS (ready-to-send) signal changing state |
| OnWrite | Data is being written into port (VARIANT analog of OnWriteData) |
| OnWriteData | Data is being written into port |
| OnReadData | Data is being read from port |
| OnIrp | Provides low-level access to device driver |
| OnTimeouts | Timeouts update on either serial port is detected |
See also
Serial Port Monitor Methods Overview, Serial Port Monitor Properties Overview