Omron CJ2 CPU UNIT - Converting Built-In RS-232 C to RS-422 A;485; RS-422 A;485 Interface Specifications

A-113
Appendices
CJ2 CPU Unit Hardware User’s Manual
A-4 Connecting to a Serial Port on the CPU Unit
App
z CP1W-CIF11 and CP1W-CIF12 RS-422A/485 Option Board Specifications
• RS-422A/485 Terminal Block
• DIP Switch for Operation Settings
z Converting Built-in RS-232C to RS-422A/485
When converting the RS-232C port on a CJ2 CPU Unit to RS-422A, using one of the following Link
Adapters and Conversion Units.
• CJ1W-CIF11 RS-422A Converter
The maximum distance is 50 m.
Either RS-422A or RS-485 can be used.
• NT-AL001 RS-232C/RS-422A Link Adapter
The maximum distance is 500 m.
Only RS-422A can be used.
RS-422A/485 Interface Specifications
Pin
No.
Setting
1 ON ON (both ends) Terminating resistance setting
OFF OFF
2 ON 2-wire
2-wire or 4-wire setting
*1
OFF 4-wire
3 ON 2-wire
2-wire or 4-wire setting
*1
OFF 4-wire
4 --- --- Not used.
5 ON RS control enabled
RS control selection for RD
*2
OFF RS control disabled (Data
always received.)
6 ON RS control enabled
RS control selection for SD
*3
OFF RS control disabled (Data
always sent.)
*1 Set both pins 2 and 3 to either ON (2-wire) or OFF (4-wire).
*2 To disable the echo-back function, set pin 5 to ON (RS control enabled).
*3 When connecting to a device on the N side in a 1: N connection with the 4-wire method,
set pin 6 to ON (RS control enabled).
Also, when connecting by the 2-wire method, set pin 6 to ON (RS control enabled).
COMM
Front Back
1. Communications status indicators
4. DIP switch for
operation settings
2. RS-422A/485 connector
RDA- RDB
+
SDA- SDB
+
FG
3. CPU Unit connector
RDB+
RDA−
SDA− SDB+
FG
Tighten the terminal block screws
to the torque of 0.28 N·m.
1 2 3 4 5 6
O
N