Rs-422A/485 Ports With 1:N, 4-Wire Connections; Rs-422A/485 Ports With 1:N, 2-Wire Connections - Omron CJ2 CPU UNIT User Manual

RS-422A/485 Ports with 1:N, 4-wire Connections

CPU Unit
Signal
name
RS- SDA−
422A/485
SDB+
Option
RDA−
Board
RDB+
FG
Terminal block
• Communications Mode: 1:N NT Link
* Switch Settings on RS-422A/485 Option Board
• Terminating resistance: ON
• 2-wire/4-wire setting: 4-wire
Note The terminating resistance setting example is for the NT631/NT631C.
The setting method depends on the PT model. Refer to the manual for your PT.

RS-422A/485 Ports with 1:N, 2-wire Connections

CPU Unit
Signal
name
RS- SDA−
422A/485
SDB+
Option
RDA−
Board
RDB+
FG
Terminal block
• Communications Mode: 1:N NT Link
* Switch Settings on RS-422A/485 Option Board
• Terminating resistance: ON
• 2-wire/4-wire setting: 2-wire
Note The terminating resistance setting example is for the NT631/NT631C.
The setting method depends on the PT model. Refer to the manual for your PT.
CJ2 CPU Unit Hardware User's Manual
Signal name
Pin
RDA
No.
3
TRM
4
RDB
1
SDA
2
SDB
5
RSA
RSB
Functional ground
Terminal block/D-sub connector
Short pin
Signal name
RDA
TRM
RDB
SDA
SDB
RSA
RSB
Functional ground
Terminal block/D-sub connector
Signal name
Pin
RDA
No.
3
TRM
4
RDB
1
SDA
2
SDB
5
Functional ground
Terminal block/D-sub connector
Short pin
Signal name
RDA
TRM
RDB
SDA
SDB
Functional ground
Terminal block/D-sub connector
PT
RS-
422A/485
interface
PT (See note.)
RS-
422A/485
interface
PT
RS-
422A/485
interface
PT (See note.)
RS-
422A/485
interface
Appendices
A-123