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Last Modified: February 7, 2020

Specifies the FlexRay slot number from which the NI-XNET FlexRay interface transmits a startup frame, during the process of integration with other cluster nodes. The default value of this property is 0 (no startup frame).

For a network (cluster) of FlexRay nodes to start up for communication, at least two nodes must transmit startup frames. If your application is designed to test only one external ECU, you must configure the XNET FlexRay interface to transmit a startup frame. If the one external ECU does not transmit a startup frame itself, you must use two XNET FlexRay interfaces for the test, each of which must transmit a startup frame.

Data type: datatype_icon

Long Name: Interface:FlexRay:Key Slot Identifier

Class: XNET Session

Permissions: Read/Write

There are two methods for configuring the XNET FlexRay interface as a coldstart node (transmit startup frame).

Output Session with Startup Frame

Create an output session that contains a startup frame (or one of its signals). The XNET Frame FlexRay:Startup? property is true for a startup frame. If you use this method, this Key Slot Identifier property contains the identifier property of that startup frame. You do not write this property.

Write this Key Slot Identifier Property

This interface uses the identifier (slot) you write to transmit a startup frame using that slot.


If you create an output session that contains the startup frame, with the same identifier as that specified in the Key Slot Identifier property, the data you write to the session transmits in the frame. If you do not create an output session that contains the startup frame, the interface transmits a null frame for startup purposes. If you create an output session that contains a startup frame with an identifier that does not match the Key Slot Identifier property, an error is returned.

You can overwrite the default value by writing an identifier that corresponds to the identifier of a startup frame prior to starting the FlexRay interface.

Where This Property Is Available:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application

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