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CAN FD connectivity

On-board pre-processing of received messages

The NI 9860 interface module is designed for National Instruments’ Compact DAQ and Compact RIO systems. It provides two CAN FD interfaces.

The NI 9860 interface module provides two CAN FD interfaces (Photo: National Instruments)

THE NI 9860 MODULE UTILIZES THE SAME architecture as the XNET Port on the Compact DAQ controllers, which requires also purchasing a XNET Transceiver Cable for each port. This allows for a flexible architecture that supports multiple protocols on one C-Series module while also allowing for field replacement. In Compact DAQ systems up to 28 CAN FD interfaces can be integrated in a single chassis operating at maximum bit-rates (currently 2 Mbit/s). The Compact RIO system is able to host up to eight CAN FD interfaces also running at the maximum bit-rates.

The required connectors with integrated CAN transceiver chips, called XNET transceiver cables, allow a replacement in case of transceiver damage. The transceiver cable allows using multiple physical layers on the same module. The modules pre-process the received CAN FD messages. This unburdens the host controller from capturing the messages in real-time and avoids the lost of data frames.

The XNET cable is also used to power the interface module (9 V to 30 V). The NI 9997 bus-bar module can be applied for connecting multiple interface modules to the power supply.

The NI 9860 is the first two-port C module of the XNET family of automotive network interfaces. As part of this family, the interface has some of the same features and benefits of other XNET devices such as the hardware-accelerated messaging with device-driven DMA. Using the same API (application programming interface) allows customers to reuse their software applications. The interfaces combine the performance and flexibility of low-level micro-controller interfaces with the speed and power of Windows and Labview real-time OS development. Designed from the ground up for performance in demanding applications such as HIL, these interfaces work well in high-signal-count, low-latency environments. The key technology behind the performance is the device-driven DMA engine. This reduces system latency, a common pain point for PC-based CAN, LIN, and FlexRay interfaces, from milliseconds to microseconds. The engine works with onboard per-port processors to move frames and signals between the interface and the user program without CPU interrupts.

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National Instruments