XS Software Selectable Physical Layer

NI-XNET Hardware and Software Help

Edition Date: November 2018

Part Number: 372841U-01

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XNET CAN XS hardware allows you to select each port individually in the physical layer for one of the following transceivers:

  • High-Speed
  • Low-Speed/Fault-Tolerant
  • Single Wire
  • External Transceiver

When an XS port is selected as High-Speed, it behaves exactly as a dedicated High-Speed interface. When an XS port is selected as Low-Speed/Fault-Tolerant, it behaves exactly as a dedicated Low-Speed/Fault-Tolerant interface. When an XS port is selected as Single Wire, it behaves exactly as a dedicated Single Wire interface. The bus power requirements depend on the mode selected. Refer to the appropriate High-Speed, Low-Speed/Fault-Tolerant, or Single Wire physical layer section to determine the behavior for the mode selected. For example, the bus power requirements for an XS port configured for Single Wire mode are identical to those of a dedicated Single Wire node. This feature is provided as the Interface:CAN:Transceiver Type property.

When an XS port is selected as External, all onboard transceivers are bypassed, and the CAN controller signals are routed directly to the 9-pin D-SUB connector. External mode is intended for interfacing custom physical layer circuits to NI XNET CAN hardware. Refer to External CAN Transceiver for more details.

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