System 2.0.0.0 4.0.0.0 System.Enum This enumeration is used with the event. A serial port pin changes state when it is asserted or unasserted.

Specifies the type of change that occurred on the object.

Field 2.0.0.0 4.0.0.0 System.IO.Ports.SerialPinChange

A break was detected on input.

Field 2.0.0.0 4.0.0.0 System.IO.Ports.SerialPinChange

The Carrier Detect (CD) signal changed state. This signal is used to indicate whether a modem is connected to a working phone line and a data carrier signal is detected.

Field 2.0.0.0 4.0.0.0 System.IO.Ports.SerialPinChange

The Clear to Send (CTS) signal changed state. This signal is used to indicate whether data can be sent over the serial port.

Field 2.0.0.0 4.0.0.0 System.IO.Ports.SerialPinChange

The Data Set Ready (DSR) signal changed state. This signal is used to indicate whether the device on the serial port is ready to operate.

Field 2.0.0.0 4.0.0.0 System.IO.Ports.SerialPinChange

A ring indicator was detected.