Omron CPM2C Operation Manual page 104

Unit Components
RS-422 Interface Block Diagram
SW2-1
SW2-2
Factory setting
SW2
1 OFF
SW2-3
2 OFF
SW2-4
3 ON
4 OFF
Note Do not set both SW2-3 and SW2-4 to ON. Doing so may result in damage to
internal circuitry. Set SW2-3 to OFF and SW2-4 to OFF when performing RS-
485 2-wire communications.
5. Connector
Connects to the communications port on the CPU Unit.
SW2
SW2-2 OFF
ON
SW2-4 OFF
ON
Section 2-2
Status
SW2-1
OFF ON
4-wire commu- Setting not
nications possible
Setting not 2-wire commu-
possible nications
SW2-3
OFF ON
Setting not Data can be
possible received at any
time
RS control Setting not
possible for possible
CPU Unit
81