Serial Settings:Modem Line Settings:Line RI State

LabVIEW 2018 Help

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

Requires: Base Development System

Classes: Instr, Serial Instr

Specifies the current state of the Ring Indicator (RI) input signal. The RI signal is often used by modems to indicate that the telephone line is ringing. This property is read only except when the Wire Mode property is set to RS232/DCE or to 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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