Omron CJ2 CPU UNIT - RS-422 A;485 Ports with 1:N, 2-Wire Connections; RS-422 A;485 Ports with 1:N, 4-Wire Connections

A-123
Appendices
CJ2 CPU Unit Hardware User’s Manual
A-4 Connecting to a Serial Port on the CPU Unit
App
A-4-2 Connection Examples
z RS-422A/485 Ports with 1:N, 4-wire Connections
• 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.
z RS-422A/485 Ports with 1:N, 2-wire Connections
• 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.
PT
RDA
TRM
RDB
SDA
SDB
RSA
RSB
3
4
1
2
5
SDA−
SDB+
RDA−
RDB+
FG
RDA
TRM
RDB
SDA
SDB
RSA
RSB
CPU Unit
Signal
name
Signal name
Pin
No.
Terminal block
Signal name
RS-
422A/485
Option
Board
Short pin
PT (See note.)
RS-
422A/485
interface
Terminal block/D-sub connector
RS-
422A/485
interface
Terminal block/D-sub connector
Functional ground
Functional ground
RDA
TRM
RDB
SDA
SDB
3
4
1
2
5
SDA−
SDB+
RDA−
RDB+
FG
RDA
TRM
RDB
SDA
SDB
CPU Unit
Signal
name
Signal name
Pin
No.
Terminal block
Signal name
PT
RS-
422A/485
Option
Board
Short pin
PT (See note.)
RS-
422A/485
interface
Terminal block/D-sub connector
RS-
422A/485
interface
Terminal block/D-sub connector
Functional ground
Functional ground