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National Instruments AT-485/4 Four-port RS-485 serial interface board
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National Instruments · ISA

AT-485/4

The National Instruments AT-485/4 is a four-port RS-485 serial interface board for ISA systems. NI's AT Serial documentation describes per-port transceiver configuration and legacy Linux setup.

ManufacturerNational Instruments
ModelAT-485/4
Product TypeFour-port RS-485 serial interface board
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Serial ports4
Serial standardRS-485
Host busISA
Transceiver configurationPer-port two-wire and four-wire modes
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Overview

Product overview

Key product information and technical features.

The AT-485/4 provides four RS-485 serial ports on an ISA expansion board. It belongs to National Instruments' AT Serial interface family.

NI's August 1999 Linux guide covers port-address and IRQ configuration, serial-driver assignment, receive FIFO settings, and transceiver selection. This is historical integration guidance, not confirmation of compatibility with present-day operating systems.

  • Four RS-485 serial communication ports.
  • ISA expansion-board format.
  • Individually selectable transceiver modes for each serial port.
  • Documented four-wire operation and two-wire modes using DTR or TXRDY automatic control.
Verified specifications

Technical data

Verified product specifications.

Serial port count4 ports
Serial communication standardRS-485
Host interfaceISA
Transceiver control modesFour-wire; two-wire DTR with echo; two-wire DTR controlled; two-wire TXRDY automatic control
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National Instruments

Manufacturer

ISA / AT Serial

Host bus and serial interface family

AT-485/4

Four-port RS-485 interface board

Legacy Linux integration

NI documents ISA resource configuration, driver assignment, FIFO setup, and transceiver selection.

Confirm ISA resources, board revision, cabling, and software requirements before integration; the cited Linux guide dates to August 1999.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

Using AT Serial with Linux — 322538A-01Legacy Installation And Configuration Guide · docs-be.ni.com
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AT Serial Linux resource, FIFO, and transceiver configurationTechnical resource
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

How many serial ports does the AT-485/4 provide?

It provides four RS-485 serial ports.

Which host expansion bus does the AT-485/4 use?

The AT-485/4 is an ISA expansion board.

Can transceiver modes be configured separately for each port?

Yes. NI's Linux guide describes selecting the mode for one port at a time with the rs485 utility. Listed modes include four-wire operation and three two-wire control modes.

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