Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 59)

Installation and Hookup 4-17
Publication 999-122 - January 1997
If you are making an RS-232C cable, only four conductors are required.
Construct the cable as shown below, making sure to use the correct
mating connector for your PC or terminal. The mating connector for
the IMC-S/23x is a standard male 9-pin D-type (AMP P/N 205204-1).
Most serial communication devices (PCs, PC compatibles, and
terminals) use one of two types of RS-232C connector. These are the
standard DB-25 (25-pin) connector and the smaller DB-9 (9-pin)
connector introduced on AT-compatible PCs. The pinouts for the
DB-25 and DB-9 and the DB-9 to DB-9 connectors are given in the
tables below.
Typical RS-232C Connector Pinout
Signal DB-25 Pin DB-9 Pin
Com
RxD
TxD
Shield
7
3
2
1 5
2
3
N/C
Typical RS-232C Connector Pinout
Signal DB-9 Pin DB-9 Pin
Com
RxD
TxD
5
2
3 5
2
3