Omron CP1H CPU Operation Manual page 726

Connections to Serial Communications Option Boards
1:1 Connections Using RS-422A/485 Port
Computer
Signal
Shield
RS-232C
Interface
5-V (+)
power (-)
1:N Connections Using RS-422A/485 Ports
Computer
Signal
Shield
RS-232C
Interface
5-V (+)
power (-)
692
NT-AL001 Link Adapter
Signal Signal
Pin Pin
D-sub, 9-pin Terminal block
connector (male)
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: OFF
NT-AL001 Link Adapter
Shield
Signal Pin
Pin Signal
D-sub, 9-pin Terminal block
connector (male)
DIP Switch Settings
Pin 1: ON
Pin 2: ON
(terminating resistance)
Pin 3: OFF
Pin 4: OFF
Pin 5: OFF
Pin 6: OFF
CPU Unit
Signal
Pin
RS-422A
/485
Option
Board
4-wire
Terminating resistance ON
B500-AL001 Link Adapter
Shield
Pin Signal Signal Pin
RS-422A/
485
Option
Board
Signal
Pin
D-sub, 9-pin
connector (male)
Shield
Appendix F
CPU Unit
Signal
Pin
RS-422A/
485
Option
Board
4-wire
Terminating resistance OFF
CPU Unit
Pin Signal
RS-422A/
485
Option
Board
4-wire
Terminating resistance ON