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NI-9871
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NI-9871, 4-Port, 3.68 Mbits/s Baud Rate, C Series Serial Interface Module

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National Instruments NI-9871 C Series Serial Interface Module

The National Instruments NI-9871 (Part Numbers: 779892-01, 779892-02, 779892-03) is a 4-Port RS485/RS422 Serial Interface Module designed to add serial communication capabilities to CompactRIO systems. The four independent ports on the NI-9871 operate in isolation from each other and from the CompactRIO chassis.

Each serial port features a 64-byte FIFO buffer that simplifies programming and conserves FPGA space. The NI-9871 is designed to be programmed using the LabVIEW FPGA Module, allowing direct FPGA-based control for precise communication timing and processing. The module does not support the LabVIEW Full Development System alone—it requires LabVIEW FPGA.

The NI-9871 is available in multiple versions: Part number 779892-02: Standard version (without conformal coating), Part number 779892-03: Conformal-coated version, providing additional protection against moisture and contaminants, Part number 779892-01: Includes four 10P10C-DE9 cables (1 meter each). This C Series Serial Interface Module supports a maximum baud rate of 3.6864 Mbps, features ±15 kV ESD protection on data lines, and allows cable lengths of up to 1.2 km (4,000 ft). The maximum power consumption is 3.5 W from an external power source (+8 to +28 VDC).

For electrical isolation, the NI-9871 offers 60 VDC continuous port-to-earth ground isolation and is tested to withstand up to 1,000 Vrms surge voltage. It connects to an external power supply via a four-position female pigtail connector. The four RS485/RS422 ports are fully electrically isolated from each other and other modules in the system.

The NI-9871 features RJ-50 connectors for serial communication, which are adaptable to DB-9 connectors via cables. This module weighs 5.4 oz and has an operating temperature range of –40 to 70 °C and a storage temperature range of –40 to 85 °C. It withstands vibrations of 5 grms (random) and 5 g (sinusoidal) at frequencies from 10 to 500 Hz.

ModelNI-9871
ManufacturerNational Instruments
Part Numbers779892-01, 779892-02, 779892-03
TypeC Series Serial Interface Module
Supported Serial ProtocolsRS-422, RS-485
Maximum Baud Rate3.6864 Mbps
Maximum Cable Length4,000 ft.
Maximum Voltage-8 to +13 VDC, maximum, Measurement Category I
Weight5.4 oz.
Front Connector TypeRJ-50 (Adaptable to DB-9 with cables)
Operating Temperature-40 to 70 °C
Storage Temperature-40 to 85 °C

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National Instruments NI-9871 Frequently Asked Questions

 

Question: Why are there three part numbers for the NI 9871?

 

Answer: The NI 9871 has two part numbers with one difference; part number 779892-02 is not conformal coated, while part number 779892-03 is conformal coated. Part number 779892-01 is the version of the NI-9871 that comes with 4 10P10C-DE9 Cables that are 1 meter in length.

 

Question: Which serial protocols are supported by the NI-9871?

 

Answer: The NI-9871 supports RS422 and RS485 serial protocols.

 

Question: Are any accessories required for the NI 9871?

 

Answer: The NI-9871 requires an external power cable, such as the .35 m PC-MF4-PT CSeries Microfit Power Cable (female to pigtail) or the .2 m PC-MF4-Y CSeries Microfit Power Y-Adapter (male to 2-female), to connect to an external power supply (+8 to +28 VDC).

 

Question: What is the maximum baud rate of the NI-9871 module?

 

Answer: The NI-9871 has a maximum baud rate of 3.6864 Mbps.

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