Rs-422A/485 Interface Specifications; Converting Built-In Rs-232C To Rs-422A/485 - Omron CJ2 CPU UNIT User Manual

RS-422A/485 Interface Specifications

CP1W-CIF11 and CP1W-CIF12 RS-422A/485 Option Board Specifications
Front
1. Communications status indicators
COMM
RDA- RDB + SDA- SDB + FG
2. RS-422A/485 connector
• RS-422A/485 Terminal Block
RDA−
RDB+ SDA− SDB+
• DIP Switch for Operation Settings

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.
CJ2 CPU Unit Hardware User's Manual
Back
3. CPU Unit connector
4. DIP switch for
operation settings
Tighten the terminal block screws
to the torque of 0.28 N·m.
FG
Pin
No.
1 ON ON (both ends)
OFF OFF
2 ON 2-wire
OFF 4-wire
3 ON 2-wire
OFF 4-wire
4 --- ---
5 ON RS control enabled
OFF RS control disabled (Data
always received.)
6 ON RS control enabled
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).
Setting
Terminating resistance setting
*1
2-wire or 4-wire setting
*1
2-wire or 4-wire setting
Not used.
RS control selection for RD
RS control selection for SD
Appendices
*2
*3
A-113