Listen Only?

Listen Only?

Data Type	Direction	Required?	Default
	Read/Write	No	False

Property Class

Embedded CAN Interface

Short Name

Listen Only?

Description

Note  You can modify this property only when the interface is stopped.

The Listen Only? property configures whether the CAN interface transmits any information to the CAN bus.

When this property is FALSE, the interface can transmit CAN frames and acknowledge received CAN frames.

When this property is TRUE, the interface can neither transmit CAN frames nor acknowledge a received CAN frame. The TRUE value enables passive monitoring of network traffic, which is useful for debugging scenarios when you do not want to interfere with a communicating network.

The execution time to read or write this property is sufficient for a high-priority loop in the LabVIEW Real-Time (RT) Module.

If you use CompactRIO with the built-in CAN port hardware as the Embedded CAN interface and the interface is the only listener on the CAN bus, the Embedded CAN interface cannot receive any CAN frame on the CAN bus. Because the interface itself does not acknowledge the CAN frame transmitter, the interface gets bit errors. If you have another CAN device that can acknowledge the CAN frame transmitter, the Embedded CAN interface receives the CAN frames without bit errors.