Serial Settings:Modem Line Settings:Line DCD State

Specifies the current state of the Data Carrier Detect (DCD) input signal. This is often used by modems to indicate the detection of a carrier (modem) on the phone line. This signal is also known as Receive Line Signal Detect (RLSD). This property is read only except when the Wire Mode property is set to RS232/DCE, or RS232/Auto with the hardware currently in the DCE state.

注释

下表列出了该属性的特性。

短名称	DCD State
数据类型
权限	读取/写入
可用于运行引擎	是
可用于实时操作系统	是

Unknown	-1
Unasserted	0
Asserted	1