NI 9871 4-Port, RS485/RS422 Serial Interface Module for CompactRIO

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  • 4 RS485/RS422 (TIA/EIA-485/422) ports for CompactRIO
  • Baud rates from 14 baud to 3.684 Mbaud; -40 to 70 °C operating range
  • Data bits: 5, 6, 7, 8; Stop bits: 1, 1.5, 2; Flow control: XON/OFF, RTS/CTS, None
  • Individual 64 B UART FIFO buffers per port
  • Transceiver modes: 4-wire, 2-wire DTR controlled, 2-wire DTR controlled with echo, 2-wire auto
  • 8 to 28 VDC externally powered; PC-MF4-PT cable included
  • Configure Complete CompactRIO System
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The NI 9871 C Series serial module adds four RS485/RS422 serial ports to NI CompactRIO systems. It interfaces directly with the CompactRIO FPGA to offer you flexibility in communicating with serial devices. The module has individual 64 B buffers on every port that save CompactRIO FPGA space and simplify programming.

This C Series module supports standard start bit, stop bit, and handshaking settings, and has baud rates up to 3.684 Mbaud per port. You can pass up to 1.28 Mbit/s of data between the module and CompactRIO.

The NI 9871 uses an external power supply to provide maximum compatibility and reliability under all serial port conditions. A 35 cm female microfit to pigtail power cable is included for quick connection to the CompactRIO external power supply. The optional PC-MF4-Y C Series microfit male to 2 female Y adapter cable is available for daisy chaining multiple NI 987x module power supplies.

NI 987x C Series modules are available in a bundle with four 10P10C modular jack to DB9 (DE9) male cables for out-of-the-box connectivity.

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Specifications Documents

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Specifications Summary


NI 9871 Packages

To use the NI 9871 , you need all items in the diagram below. Select Option 1 if you already own a CompactRIO System, or Option 2 if you do not already own a chassis, controller, or software.

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CompactRIO System

NI 9871



NI 9871
- 779892-02 Qty $ 655 each
- 779892-03 Qty $ 819 each
- 779892-01 Qty $ 742 each
Optional Accessories
Qty $ 21 each
Qty $ 9 each
Qty $ 26 each
10P10C-DE9M-JS Serial Cable, 10-pos plug to DE9-M Jackscrews (2m) - 199022-02
Qty $ 26 each
RS485/RS422 Null Modem Cable (1m) - 183283-01
Select length:
Qty $ 28 each

Subtotal: $ 655

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