NI PXI-8423
NI PXI-8423
NI PXI-8423
NI PXI-8423
NI PXI-8423

NI PXI-8423 | RS-485/RS-422 Interface Card

  • Brand:​ National Instruments (NI)
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    Model:​ PXI-8423
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    Product Type:​ PXI Serial Interface Module
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    Series:​ NI PXI Platform
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    Core Function:​ Provides high-performance RS-485 and RS-422 serial communication for PXI-based test, measurement, and control systems.
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    Key Specs:​ 4 ports, RS-485/RS-422, 3 MBaud, 128-byte FIFO, NI-Serial driver.
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Description

PXI-8423: Product Overview
The National Instruments PXI-8423 is a high-performance 4-port serial interface module for PXI systems, providing robust RS-485 and RS-422 communication capabilities. This module enables reliable data exchange with industrial devices, instruments, and control systems that use serial communication protocols. Installed in a PXI chassis, it serves as a critical communication interface in automated test, measurement, and control applications.
The module features four independent serial ports that can be individually configured for RS-485 or RS-422 operation, providing flexibility for various application requirements. With support for data rates up to 3 MBaud per port and 128-byte FIFO buffers, the PXI-8423 ensures reliable high-speed data transfer while minimizing CPU overhead. The module includes advanced features like programmable data formatting, hardware flow control, and extensive error checking, making it suitable for demanding industrial and laboratory environments.

NI PXI-8423

NI PXI-8423

PXI-8423: Technical Specifications
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    Model Number:​ PXI-8423
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    Manufacturer:​ National Instruments
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    Product Type:​ PXI Serial Interface Module
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    Form Factor:​ 3U PXI Module
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    Number of Ports:​ 4 independent serial ports
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    Supported Standards:​ RS-485, RS-422
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    Data Transfer Rate:​ Up to 3 MBaud per port
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    FIFO Buffer:​ 128-byte per port
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    Data Bits:​ 5, 6, 7, or 8 bits
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    Stop Bits:​ 1, 1.5, or 2 bits
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    Parity:​ None, odd, even, mark, space
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    Flow Control:​ Hardware (RTS/CTS) and software (XON/XOFF)
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    Connector:​ 100-position high-density I/O connector
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    Driver Software:​ NI-Serial
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    Operating Systems:​ Windows, Linux
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    Programming:​ LabVIEW, C, C#, Python
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    Power Consumption:​ 1.5W typical
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    Operating Temperature:​ 0°C to 55°C

    NI PXI-8423

    NI PXI-8423

Core Features & Customer Value
The PXI-8423’s primary value lies in its high-performance serial communication capabilities​ for industrial automation and test systems. The four independent ports enable simultaneous communication with multiple devices, while the 3 MBaud data rate ensures efficient data transfer in time-critical applications. The RS-485 support​ allows for robust multi-drop networks covering long distances (up to 1200 meters), making it ideal for industrial environments.
The module’s hardware and software flow control​ mechanisms prevent data loss during high-speed communication, while the 128-byte FIFO buffers​ reduce CPU overhead by handling data bursts efficiently. NI-Serial driver software​ provides a consistent API across different programming environments, simplifying application development and maintenance. The module’s PXI platform integration​ ensures synchronized operation with other measurement and control modules in the chassis.
Typical Applications
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    Industrial Automation:​ Communicating with PLCs, motor drives, and HMIs in manufacturing systems
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    Test Systems:​ Automated testing of embedded systems with serial interfaces
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    Data Acquisition:​ Collecting data from serial-based sensors and instruments
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    System Integration:​ Bridging legacy serial devices to modern PXI-based control systems

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