Serial Settings:Modem Line Settings:Line DCD State

LabVIEW 2018 Help

Edition Date: March 2018
Part Number: 371361R-01
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Short name: DCD State

Requires: Base Development System

Classes: Instr, Serial Instr

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.


-1 Unknown
0 Unasserted
1 Asserted


The following table lists the characteristics of this property.

Data type
Permissions Read/Write


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