81
Unit Components Section 2-2
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 Status
SW2-1
SW2-2
SW2-1
OFF ON
SW2-2 OFF 4-wire commu-
nications
Setting not
possible
ON Setting not
possible
2-wire commu-
nications
SW2-3
SW2-4
SW2-3
OFF ON
SW2-4 OFF Setting not
possible
Data can be
received at any
time
ON RS control
possible for
CPU Unit
Setting not
possible
Factory setting
OFF
OFF
ON
OFF
SW2
1
2
3
4
RS-422 Interface Block Diagram
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