Description
The National Instruments PCI-8512 (often cataloged under part numbers like 781034-01 for the 1-port variant or 781035-01 for the 2-port variant) is a high-speed Controller Area Network (CAN) interface board designed for universal PCI slots. Powered by the NI-XNET driver software framework, this hardware interface is engineered for real-time applications requiring high-performance desktop or industrial PC testing, such as hardware-in-the-loop (HIL) simulations, automotive bus monitoring, and rapid prototyping of electronic control units (ECUs).
Commercial Availability & Terms
- Condition: New Original (Factory Sealed Surplus) or Refurbished (Tested, Certified, and Calibrated)
- Warranty: 12-Month Comprehensive Industrial Test Equipment Warranty
- Availability: In Stock
- Standard Lead Time: Ships within 1–2 business days via global express shipping networks
- Pricing Note: Price depends on whether you require the single-port or dual-port layout and its current calibration certification status. Contact our instrumentation sales engineering desk for a formal quotation.
Technical Specifications
| Parameter | Value / Specification |
| Bus Interface | Universal PCI (Compatible with 3.3 V and 5 V signaling environments) |
| CAN Transceiver Class | High-Speed / FD (Flexible Data-Rate supported on newer hardware revisions) |
| Onboard Controller | NI-XNET custom processing engine |
| Baud Rates Supported | 40 Kbps up to 1 Mbps (High-Speed CAN boundary); up to 8 Mbps for CAN FD payloads |
| Physical Connector | 9-pin male D-sub (Standard CiA DS102 pinout configuration) |
| Integrated Termination | Software-selectable onboarding resistors (60 \Omega / 120 \Omega / Disabled) |
| External Power Requirement | requires +9 V to +30 V DC injected on V+ pin to power transceiver |
Technical Pinout Configuration (9-Pin Male D-Sub)
The physical ports on the PCI-8512 strictly adhere to the standard CAN open automation pin assignments. When fabricating test harness cables, refer to the layout below:
- Pin 1: No Connection (Reserved)
- Pin 2: CAN_L (Dominant Low differential bus line)
- Pin 3: CAN_GND (Transceiver ground reference)
- Pin 4: No Connection
- Pin 5: SHLD (Optional cable shield ground)
- Pin 6: COM (Logic ground reference return)
- Pin 7: CAN_H (Dominant High differential bus line)
- Pin 8: No Connection
- Pin 9: V+ (External transceiver power input: +9 V to +30 V DC)
Field Integration & Software Constraints
When installing the PCI-8512 inside an engineering test bench, several integration parameters must be maintained:
- External Transceiver Power (Pin 9): A frequent point of failure during initial deployment is the failure to supply external power to the physical board transceiver layer. While the host PCI slot powers the onboard NI-XNET core processor, the galvanic isolation barrier requires an external +9 V to +30 V DC power supply tied directly to Pin 9 relative to Pin 3 to activate the CAN communication chips. If missing, the NI-XNET software utility will flag a transceiver power failure error.
- Software Driver Compatibility (NI-XNET vs. NI-CAN): The PCI-8512 is built exclusively for the modern NI-XNET API. It cannot be programmed using the legacy NI-CAN API syntax (
ncConfigorncOpen). Ensure your software suites (LabVIEW, VeriStand, MATLAB, or custom C# environments) utilize NI-XNET driver tools. The NI-XNET engine handles frame-to-signal conversions directly on the hardware board processor, drastically dropping host CPU load and providing sub-millisecond real-time loop synchronization. - Bus Termination Principles: High-speed CAN configurations require a nominal 60 \Omega total network impedance, achieved by placing a 120 \Omega termination resistor at each physical end of the main bus trunk. The PCI-8512 features digital, software-configurable internal termination resistors. Technicians can toggle these parameters inside the NI Measurement & Automation Explorer (MAX) utility without needing to wire external physical resistors into the diagnostic test harness.
Frequently Asked Questions
Does the PCI-8512 support standard CAN FD (Flexible Data-Rate) topologies?
Yes, modern hardware builds of the PCI-8512 integrated into the NI-XNET ecosystem support both classic CAN (up to 1 Mbps) and CAN FD payloads (up to 8 Mbps). However, older legacy production cards may be restricted to standard High-Speed CAN processing. Always verify the exact assembly number sticker on the back of the PCB to confirm CAN FD processing compliance.
Can this interface board run inside a non-real-time standard Windows OS?
Yes. The PCI-8512 operates on standard Windows desktop OS platforms for manual data logging, diagnostic troubleshooting, and code development. It is equally compatible with NI LabVIEW Real-Time target systems (such as industrial PC rigs) for applications requiring strict, deterministic timing for hardware-in-the-loop (HIL) automotive validation cycles.
How do you diagnose a “Form Error” or “Bit Error” flag in the LabVIEW trace window?
These transmission flags typically point to physical layer network issues. Use an oscilloscope or digital multimeter to verify that the differential resistance between CAN_H (Pin 7) and CAN_L (Pin 2) reads roughly 60 \Omega with the network powered down. If the resistance reads 120 \Omega, one terminator is missing. If it reads significantly lower than 60 \Omega, there are too many active terminators or a physical short circuit exists across the twisted-pair cable.
