Serial Module Operating Instructions and Specifications

NI 9871 Operating Instructions 6 ni.com

Wiring the NI 9871

The NI 9871 has four RJ-50 receptacles that provide connections

for four RS485/RS422 devices.

Table 1. RS485/RS422 Port Pinout

RJ-50 Pin Signal Name*

1 No Connect

2 TXD–

3 TXD+

4 RTS–

5 CTS–

6 RXD–

7 RXD+

8 RTS+

9 CTS+

10 GND

* These signals are shared by all four RJ-50 connectors on the NI 9871.

RJ50 Jack

TXD–

TXD+

RTS–

CTS–

RXD–

RXD+

RTS+

CTS+

COM