Converting The Built-In Rs-232C Port To Rs-422A/485 - Omron CP1E Series User Manual

Connection Examples
2-Wire and 4-Wire Transmission Circuits
The transmission circuits for 2-wire and 4-wire connections are different, as shown in the following
diagram.
Example of 4-Wire Connections
2/4-wire switch
(DPDT)
Option Board
Precautions for Correct Use Precautions for Correct Use
Use the same type of transmission circuit (2-wire or 4-wire) for all nodes.
Do not use 4-wire connections when the 2/4-wire switch on the Board is set to 2-wire.
Wiring Example: 1:1 Connections
• Two-wire Connections
CP1E N-type CPU Unit
RS-422A/485 Option Board
Pin Signal
3 SDA-
4 SDB+
1 RDA-
2 RDB+
5 FG
• Four-wire Connections
CP1E N-type CPU Unit
RS-422A/485 Option Board
Pin Signal
3 SDA-
4 SDB+
1 RDA-
2 RDB+
5 FG
A-4-3

Converting the Built-in RS-232C Port to RS-422A/485

Use one of the following Conversion Units to convert a built-in RS-232C port to an RS-422A port for a
CP1E N-type CPU Unit.
• CJ1W-CIF11 RS-422A Conversion Unit
Maximum distance: 50 m, convertible to RS-422A or RS-485.
• NT-AL001 RS-232C/RS-422A Conversion Unit:
Maximum distance: 500 m, convertible to RS-422A only.
CP1E CPU Unit Hardware User's Manual(W479)
Example of 2-Wire Connections
Other Unit
Other Unit
Remote device
Signal
A(–)
B(+)
FG
Shield
Remote device
Signal
RDA
RDB
SDA
SDB
FG
Shield
2/4-wire switch
(DPDT)
Other Unit
Not connected
Option Board
Appendices
Other Unit
A-37