Table Of Contents

CAN Interfaces

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    Last Modified: January 12, 2018

    CAN interfaces are software representations of physical ports.

    You use CAN interfaces to communicate between your hardware and a CAN database.

    Term Definition
    port Physical connector on an NI hardware device
    interface Software object representing a single CAN connector on a hardware device. This software object communicates with external hardware described in the database.

    Each interface name uses the syntax <protocol><n>. For example, if you have a two-port CAN device in your system, the interface names are CAN1 and CAN2. Devices that use a transceiver cable receive an interface name only when a transceiver cable is connected and identified.

    You can use an interface name as an alias to any port so that your application does not need to change when your hardware configuration changes.

    Using Interface Settings to Update the Software Baud Rate

    Complete the following steps to adjust the baud rates using the Interface Settings dialog.

    1. Use the Baud rate pull-down menu to select an applicable baud rate to all clusters, if necessary.
    2. (FD baud rate) Select the applicable I/O Mode to enable the FD baud rate pull-down menu, if necessary. The following table explains the available I/O Modes.
      Option Meaning
      CAN This is the default CAN 2.0 standard I/O mode as defined in ISO 11898-1:2003. A fixed baud rate is used for transfer, and the payload length is limited to 8 bytes.
      CAN FD (FD baud rate enabled) CAN FD—This is the CAN FD mode as specified in the CAN with Flexible Data-Rate specification, version 1.0. Payload lengths up to 64 are allowed, but they are transmitted at a single fixed baud rate.
      CAN FD + BRS (FD baud rate enabled) CAN FD+BRS—This is the CAN FD as specified in the CAN with Flexible Data-Rate specification, version 1.0, with the optional Baud Rate Switching enabled. The same payload lengths as CAN FD mode are allowed; additionally, the data portion of the CAN frame is transferred at a different (higher) baud rate.
    3. Select the FD baud rate from the pull-down menu to select an applicable fast data baud rate for all clusters.

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