The National Instruments AT-485/2 is a two-port RS-485 serial interface board for computers with ISA slots.
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Key product information and technical features.
The AT-485/2 adds two RS-485 serial ports to an ISA-based computer. NI identifies it alongside the four-port AT-485/4 in its historical serial interface catalog.
An NI-published laboratory case study documents the AT-485/2 connecting a PC to a Phoenix Contact InterBus-R command and control module over RS-485 for laboratory monitoring and control.
Verified product specifications.
| Port count | 2 ports |
|---|---|
| Serial standard | RS-485 |
| Host interface | ISA |
| Transceiver control modes | Four-wire; two-wire DTR with echo; two-wire DTR controlled; two-wire TXRDY automatic control |
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Manufacturer
Computer expansion bus
Two-port RS-485 serial interface
NI's historical Linux guide covers port addresses, IRQ assignment, and transceiver configuration.
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Product-specific answers based on available technical information.
It provides two RS-485 serial ports.
The AT-485/2 is an ISA interface board, not a PCI board.
Yes. NI's August 1999 guide explicitly includes the AT-485/2 and describes setup using historical Linux tools. It does not verify compatibility with current Linux distributions.