Wiring; Wiring Precautions; Port Types; Communications Modes And Ports - Omron CJ1W-SCU32 Operation Manual

3 Installation and Wiring
3-2

Wiring

3-2-1

Wiring Precautions

• Before you connect or disconnect the communications cables, always make sure that the Controller
power is turned OFF.
• Tighten the communications connector screws firmly with your fingers.
• You can connect Serial Communications Units to various devices. For compatibility, refer to the oper-
ation manuals for the devices to be connected.
3-2-2

Port Types

The following port types are provided on the Serial Communications Units.
Model
CJ1W-SCU22
CJ1W-SCU32
CJ1W-SCU42
The following sections describe the connection methods used for each serial communications mode
and Serial Communications Unit port.
3-2-3

Communications Modes and Ports

The following table shows the relationship between the communications ports and the communications
modes for the Serial Communications Unit.
Communications mode
Protocol Macros Yes
Serial Gateway Yes
No-protocol Yes
Modbus-RTU Slave Yes
* You can be use the NT-AL001 Link Adapter to convert RS-232C to RS-422A/485 and vice versa to enable 1:N
communications.
3-4
Port 1 Port 2
RS-232C RS-232C
RS-422A/485 RS-422A/485
RS-422A/485 RS-232C
RS-232C
1:1 1:N (*)
Yes
Yes
Yes
Yes
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
RS-422A/485
1:1 4-wire 1:N 4-wire
Yes Yes
Yes Yes
Yes Yes
Yes Yes
1:1 2-wire 1:N 2-wire
Yes Yes
Yes Yes
No No
Yes Yes