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National Instruments PXI-8431/4 Four-port RS-485/RS-422 serial interface module
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National Instruments · PXI

PXI-8431/4

The National Instruments PXI-8431/4 is a four-port, non-isolated RS-485/RS-422 serial interface for PXI systems. NI lists a maximum baud rate of 3 Mbaud, with a lower limit in two-wire automatic transceiver-control mode.

ManufacturerNational Instruments
ModelPXI-8431/4
Part Number778985-01
Product TypeFour-port RS-485/RS-422 serial interface module
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PlatformPXI
Serial ports4
StandardsRS-485 and RS-422
IsolationNon-isolated
Connector10-position modular jack (10P10C)
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Overview

Product overview

Key product information and technical features.

The PXI-8431/4 adds four RS-485/RS-422 serial ports to a PXI system. It is the four-port member of the PXI-8431 family, alongside the two-port PXI-8431/2 and eight-port PXI-8431/8.

NI documents 10P10C modular connectors and 128-byte FIFOs. Check the documented pinout and transceiver-control mode before selecting cabling and setting communication parameters.

  • Four RS-485/RS-422 serial ports on a PXI interface.
  • Maximum baud rate of 3 Mbaud; two-wire automatic control is limited to 2 Mbaud.
  • 128-byte FIFO size.
  • Listed in NI-Serial 21.3 and NI-Serial 19.0 for LabVIEW Real-Time supported-interface tables.
Verified specifications

Technical data

Verified product specifications.

Serial port count4 ports
Serial standardsRS-485/RS-422
IsolationNo
Maximum baud rate3 Mbaud
Maximum baud rate in two-wire automatic control mode2 Mbaud
I/O connector10-position modular jack (10P10C)
FIFO size128 bytes
Board dimensions100 × 160 mm
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National Instruments

Manufacturer

PXI

Hardware platform

PXI-8431/4

Four-port RS-485/RS-422 serial interface

Driver reference

NI-Serial 21.3 lists this model as supported hardware.

Check the 10P10C pinout and driver/OS requirements before integration; this model is non-isolated.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI Serial Hardware Specifications and Features GuideSpecifications And Hardware Reference · docs-be.ni.com
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PXI-8431/4 Dimensional DrawingsDimensional Drawings And CAD Models · ni.com
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NI-Serial 21.3 ReadmeDriver Support Reference · ni.com
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NI-Serial 19.0 for LabVIEW Real-Time ReadmeReal-time Driver Support Reference · ni.com
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PXI-8431/4 Product CertificationsTechnical resource
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Shipping, warranty & returns

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Returns
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Is the PXI-8431/4 an RS-232 interface?

No. NI identifies it as a four-port RS-485/RS-422 interface.

Are the serial ports isolated?

No. NI lists the PXI-8431/4 as non-isolated.

Does the 3 Mbaud maximum apply to every operating mode?

No. Two-wire automatic RS-485 transceiver control has a 2 Mbaud maximum.

Which connector does the module use?

The module uses 10-position modular jacks (10P10C). Consult NI's hardware guide for pin assignments.

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