NI 9871 Operating Instructions 6 ni.com
Wiring the NI 9871The 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*
1No Connect
2TXD–
3TXD+
4RTS–
5CTS–
6RXD–
7RXD+
8RTS+
9CTS+
10 GND
* These signals are shared by all four RJ-50 connectors on the NI 9871.
RJ50 Jack
NC
TXD–
TXD+
RTS–
CTS–
RXD–
RXD+
RTS+
CTS+
COM
1
2
3
4
5
6
7
8
9
10