Description
NI PXIE-8431/8 PXIe Serial Interface Module
The NI PXIe-8431/8 is a high-performance, 8-port serial interface module designed for communicating with RS485 and RS422 devices. Based on the PXI Express (PXIe) standard, it provides high-speed data transmission and advanced features for automated test and measurement systems.
Technical Specifications
The following table outlines the primary technical parameters of the module:
| Parameter | Specification |
| Bus Interface | PXI Express (x1 Gen 1) |
| Number of Ports | 8 |
| Serial Protocols | RS485, RS422 (2-wire and 4-wire) |
| Max Baud Rate | Up to 3.0 MBaud |
| Connector Type | 68-pin VHDCI |
| FIFO Size | 128 bytes (Transmit/Receive) |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| DMA Support | Yes (Direct Memory Access for high efficiency) |
Key Product Advantages
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High-Speed Performance: Unlike standard serial ports, the 8431/8 supports custom baud rates up to 3 MBaud with better than 1% accuracy, making it ideal for high-bandwidth data logging.
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Hyper-Threading and Multicore Support: The NI-SERIAL driver is optimized for modern processors, allowing the module to handle high-speed data across all 8 ports simultaneously without taxing the CPU.
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Isolation and Reliability: Designed for industrial environments, it offers robust communication even in electrically noisy settings.
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Ease of Integration: It is fully compatible with NI LabVIEW, LabWindows/CVI, and Measurement & Automation Explorer (MAX) for quick configuration and deployment.
Important Considerations (Usage Notes)
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Cabling: Since the module uses a high-density VHDCI 68-pin connector, you will likely need a breakout cable (such as the NI 10-port or 8-port VHDCI-to-D-Sub cable) to connect to individual devices.
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Termination: For RS485/RS422 networks, especially at high baud rates or over long distances, ensure proper 120 Ω termination is applied to prevent signal reflection.
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Driver Requirements: Ensure that the NI-SERIAL driver is installed before inserting the hardware into the PXIe chassis.
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Power Dissipation: Ensure your PXIe chassis has adequate cooling, as high-speed multi-port communication can generate significant heat.
Common Applications
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Automated Test Equipment (ATE): Controlling multiple instruments or Units Under Test (UUTs) simultaneously.
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Industrial Automation: Interfacing with PLCs, motor drives, and HMI panels using RS485.
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Aerospace & Defense: High-speed data links for satellite or avionics component testing.
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Data Acquisition: Collecting data from large sensor networks distributed across a facility.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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