703
Connections to Serial Communications Option Boards Appendix F
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.
(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.
CPU Unit
Pin
Signal
Signal
PT
Terminal block or
D-sub connector
FG
Terminal block
RS-422A
/485
Interface
Short bar
Signal
PT
Terminal block or
D-sub connector
FG
RS-422A
/485
interface
(See note 2.)
RS-422A
/485
Option Board
CPU Unit
Pin
Signal
Signal
PT
FG
D-sub, 9-pin
connector (male)
RS-422A
/485
Interface
Short bar
Signal
PT
Terminal block
(See note 2.)
RS-422A
/485 Option
Board
RS-422A
/485
Interface
FG
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