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National Instruments · PXI

PXI-8420/8

The National Instruments PXI-8420/8 adds eight RS-232 serial ports to a PXI system. It uses a 68-pin SCSI-type connector and supports a maximum baud rate of 115.2 kbit/s.

ManufacturerNational Instruments

ModelPXI-8420/8

Part Number777733-08

Product TypeEight-port RS-232 serial interface module

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Serial ports8 RS-232

Maximum baud rate115.2 kbit/s

I/O connector68-pin SCSI type

IsolationNon-isolated

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Overview

Product overview

Key product information and technical features.

The PXI-8420/8 belongs to NI's PXI serial hardware family. Its 16550-compatible UART architecture supports standard PC COM-port operation, while FIFO buffering reduces susceptibility to interrupt latency.

Software selection is important for this legacy interface: NI documents that NI-Serial 17.0 removed support for the PXI-8420 family. Verify the intended driver and operating-system combination before integration.

Eight RS-232 ports on one PXI interface.
16550-compatible UARTs for standard PC COM-port compatibility.
FIFO buffering helps accommodate interrupt latency.
Plug-and-Play architecture supports switchless configuration.

Verified specifications

Technical data

Verified product specifications.

Platform	PXI
Serial standard	RS-232
Port count	8 ports
Maximum baud rate	115.2 kbit/s
I/O connector	68-pin SCSI type
Isolation	No
FIFO size	64 bytes
Board dimensions	100 × 160 mm

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National Instruments

Manufacturer

PXI

Hardware platform

PXI-8420/8

RS-232 interface

Device-side connections

A breakout cable converts the module's 68-pin connector to eight male DB-9 connectors.

Confirm legacy driver support and the required breakout cable before integration.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI Serial Legacy Hardware Specifications and Features GuideSpecifications And Features Guide · docs-be.ni.com

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Getting Started with Your PXI Serial Hardware and Software for Windows NTArchived Installation And User Guide · docs-be.ni.com

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NI-Serial 21.3 ReadmeDriver Release Notes · ni.com

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Legacy serial hardware specifications and connector informationTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does the PXI-8420/8 provide RS-485 ports?

No. This model provides eight non-isolated RS-232 ports.

Does NI-Serial 17.0 support the PXI-8420/8?

No. NI lists the PXI-8420 family among the interfaces whose support was removed in NI-Serial 17.0. Check an earlier driver's documentation against your operating system.

Can applications access the interface as standard COM ports?

NI's PXI serial hardware guide documents standard PC COM-port compatibility through 16550-compatible UARTs.