PXIE-8431/8 NI 8-Port RS485/RS422 Serial Interface Module

Description PXIE-8431/8 NI 8-Port RS485/RS422 Serial Interface Module Product Dimensions： Product Description (Detailed Explanation) The PXIe-8431/8 is a hardware interface that allows a PXI Express system to communicate with up to eight independent serial devices simultaneously. It utilizes the high-bandwidth PXIe backplane to ensure rapid data throughput and minimal latency. This module features a high-performance DMA (Direct Memory Access) engine, which allows data to move between the serial ports and system memory without taxing the CPU. It is fully compatible with LabVIEW Real-Time for deterministic control and appears as standard COM ports in Windows, ensuring compatibility with legacy serial software. Product Parameters (Technical Specifications) Parameter Category Specification Form Factor PXI Express (PXIe) – 1 Slot Number of Ports 8 Serial Ports Serial Protocols RS-485, RS-422 Max Data Rate Up to 3.0 Mbps Baud Rate Accuracy Within 0.01% (Standard) / 1.3% (Non-standard up to 3 Mbps) FIFO Size 128 Bytes (Transmit and Receive) Connector Type 68-pin VHDCI (Includes breakout cable to 8x DB9) Power Requirement 3.3 VDC (0.7A Typical, 1.5A Max) Operating Temp 0°C to 55°C Isolation Non-isolated (Refer to 8433 series for isolated versions) Product Advantages (Key Benefits) Extreme Throughput: Supports high-speed communication up to 3 Mbps, significantly faster than standard PC serial ports. Low CPU Overhead: The integrated DMA engine and multithreading support allow the host controller to focus on data analysis rather than managing communication interrupts. Flexible Configuration: Users can software-select between 2-wire (Half-Duplex) and 4-wire (Full-Duplex) modes for each port independently. Custom Baud Rates: Unlike fixed-rate controllers, this module supports almost any non-standard baud rate with high precision, essential for specialized industrial sensors. Seamless Integration: Works natively with the NI-Serial driver and NI-VISA, making it easy to program in LabVIEW, C , or Python. Precautions (Important Notes) Cable Management: The module uses a high-density VHDCI connector. Always use the original NI-certified breakout cable (SCSI-68 to DB9) to ensure signal integrity and prevent mechanical strain on the port. Termination: For RS-485 networks, ensure proper 120-ohm termination is applied at the ends of the bus to prevent signal reflections, especially at high baud rates. Non-Isolated Design: As this is a non-isolated module, ensure that ground potential differences between the PXI chassis and field devices are minimized to prevent ground loops or hardware damage. Software Requirement: Requires the NI-Serial driver to be installed before the hardware is inserted into the chassis for proper Windows/Real-Time OS recognition. Product Applications (Typical Use Cases) Automated Test Equipment (ATE): Controlling multiple programmable power supplies, loads, and climate chambers in a single test rack. Industrial Automation: Interfacing with a large array of RS-485 based Modbus slaves, such as motor drives (VFDs) and PLC I/O stations. Aerospace & Defense: High-speed data logging from serial telemetry sensors or GPS units during flight simulation or structural testing. Semiconductor Testing: Communicating with clean-room robotics and specialized wafer-handling equipment that requires high-speed serial feedback. 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