Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 52)

4-10 Installation and Hookup
Publication 999-122 - January 1997
To configure serial port B for DH-485 communications, carefully move
the rightmost pair of switches to their up positions using a pen, small
screwdriver, etc. For example, the figure below shows serial port A
configured for RS-232 and serial port B configured for DH-485.
Refer to the Allen-Bradley publication "Data Highway/Data Highway
Plus/DH-485 Cable Installation Manual" (1770-6.2.2) for information
on proper DH-485 cable termination. If termination is not required in
your application, move the rightmost switch to its down position and
replace the motion controller module.
RS-422
RS-232
220 W
RS-422
T
e
rm
.
RS-422 DH-485 220 W
RS-422
T
e
rm
.
220 W
DH-485
T
e
rm
.
No 220
Ω
RS-422
T
e
rm
.
No 220
Ω
RS-422
T
e
rm
.
RS-232
RS-232/422
No DH-485
T
e
rm
.
SW1
Port B