9866 National Instruments Interface module

Description

9866 National Instruments Interface module

Product Dimensions：

Product Description

The NI 9866 is a LIN (Local Interconnect Network) interface module for the CompactDAQ and CompactRIO platforms. It provides a single-port interface for communicating with LIN-based systems, which are commonly found in automotive applications for controlling non-critical functions like windows, climate control, and lighting. The module leverages the powerful NI-XNET platform, allowing for high-speed, real-time communication and advanced data manipulation.

Product Specifications

• Bus Type: LIN (Local Interconnect Network)
• Number of Ports: 1
• Data Rate: 20 kb/s (max)
• Connector Type: 9-pin male D-Sub
• Controller: Fully compliant with LIN 1.3, 2.0, 2.1, and 2.2 specifications.
• Bus Interface: C Series (for use in a CompactDAQ or CompactRIO chassis)
• Bus-Powered: Requires an external power supply of +8 V to +18 V for LIN operation, which is typically supplied from the LIN bus itself.
• Isolation: The LIN port is electrically isolated from other modules in the system.

Product Advantages

The NI 9866 is a specialized but powerful tool for LIN applications, offering several key benefits:

• Real-Time Performance: The module’s integration with the NI-XNET platform provides a device-driven DMA engine that minimizes message latency and frees up the host processor for other tasks. This is crucial for applications that require deterministic, real-time control.
• Seamless Integration with the NI Ecosystem: It works perfectly within the CompactDAQ and CompactRIO platforms. This allows you to combine LIN communication with other measurements, such as analog inputs and digital I/O, within the same rugged, compact chassis.
• Simplified Development: The NI-XNET API simplifies the process of sending and receiving LIN frames and signals, making it easier to develop complex applications in LabVIEW, C/C++, and NI VeriStand.
• Integrated Signal Databases: It supports signal databases (e.g., LDF files), which automatically translate raw LIN frames into engineering-level signals, saving significant development and debugging time.

Applications

The NI 9866 is primarily used in the automotive industry and other areas where LIN communication is present. Common applications include:

• Hardware-in-the-Loop (HIL) Simulation: Simulating LIN devices and networks for testing electronic control units (ECUs).
• Rapid Control Prototyping: Quickly developing and testing new control algorithms on a real-time LIN network.
• Bus Monitoring and Replay: Logging and replaying LIN bus traffic for analysis and troubleshooting.
• Automation Control: Integrating LIN devices into automated test systems and production lines.

Important Considerations

For optimal performance and safety, keep these points in mind when using the NI 9866:

• External Power: The module requires an external power supply of +8 V to +18 V to operate the LIN transceiver. This is a critical point and is a common source of issues if forgotten.
• Cabling: Use high-quality, shielded LIN cables. The LIN bus requires a specific RC time constant, and proper cabling helps maintain signal integrity and EMC performance.
• Master/Slave Configuration: Remember to properly configure your system as a LIN master or slave. The master node requires a software-selectable termination resistor, while slave nodes have built-in termination.
• Software and Drivers: The module relies on the NI-XNET driver for all its functionality. This driver must be installed and configured correctly on your host PC or real-time target.
• LDF File: For advanced applications, having a valid LIN Description File (.ldf) is essential for defining frames and signals, which significantly simplifies programming.

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