
Compact FieldPoint Accessories 4 ni.com
Signal Assignments for Serial Cable Adapters
Table 1 lists the pins on all the cFP-20xx controller cable adapters
and the RS-232 and RS-485 signals assigned to them.
I/O Connector Cable Adapters
NI offers three cable adapters for use with the 37-pin I/O
connectors on the Compact FieldPoint backplane.
Caution Compact FieldPoint I/O connector cable
adapters are for use only with nonhazardous voltages.1
For hazardous voltage wiring, use cFP-CB-xconnector
blocks and follow local electrical standards.
Part numbers 778621-01 and 778621-02 are 37-pin male to 37-pin
female cable adapters in 1 and 2 m lengths, respectively. They are
designed for connecting directly to DIN rail–mounted terminal
blocks, part numbers 778672-01 and 778673-01.
Table 1. Compact FieldPoint Serial Cable Pin Descriptions
DB-9 Pin RS-232 Signal
RJ-50 Pin or
Screw Terminal RS-485 Signal
1DCD 10 GND
2RX 9CTS+(HSI+)
3TX 8RTS+
(HSO+)
4DTR 7RXD+
5CND 6RXD–
6DSR 5CTS–(HSI–)
7RTS 4RTS–(HSO–)
8CTS 3TXD+
9RI 2TXD–
—No Connect 1No Connect
1Nonhazardous voltage is voltage below 42.4 Vrms or 60 VDC.