Omron CP1H CPU

694
Connections to Serial Communications Option Boards Appendix F
Note (1) RS-422A/485 Option Board settings:
Terminating resistance ON, 4-wire.
(2) The terminating resistant setting shown above is an example for the NT631/NT631C. The setting
method varies with the PT. Refer to the manual for you PT for details.
1:N, 4-wire Connections from RS-422A/485 to RS-422A/485 Ports
• Communications Mode: 1:N NT Link
Note (1) RS-422A/485 Option Board settings:
Terminating resistance ON, 4-wire.
(2) The terminating resistant setting shown above is an example for the NT631/NT631C. The setting
method varies with the PT. Refer to the manual for you PT for details.
1:N, 2-wire Connections from RS-422A/485 to RS-422A/485 Ports
• Communications Mode: 1:N NT Link
Note (1) RS-422A/485 Option Board settings:
Terminating resistance ON, 2-wire.
CPU Unit
Pin
Signal
Signal
Terminal block or D-sub
connector
RS-422A
/485
Option
Board
Terminal block
Short bar
Terminal block or D-sub
connector
RS-422A
/485 In-
terface
RS-422A
/485 In-
terface
FG
FG
Signal
(See note 2.)
PT
PT
Pin
Signal
Signal
Terminal block or D-sub connector
FG
RS-422A
/485 In-
terface
Short bar
Signal
RS-422A
/485 In-
terface
Terminal block or D-sub connector
FG
(See note 2.)
CPU Unit
RS-422A
/485
Option
Board
Terminal block
PT
PT