1 Introduction
1-4
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
The following serial communications modes are supported by the Serial Communications Units:
Protocol Macro, No-protocol, Modbus-RTU Slave, and Loopback Test Modes. You can also connect
the devices shown in the following diagram.
There is another serial communications mode, Serial Gateway, which enables connection with the
following devices.
Connectable Devices
Serial Communications Unit
General-purpose
external device
Programming
Device
Host computer
General-purpose
external device
Programming
Device
Host computer
NJ-series PLC
CPU Unit
message
Message
Serial
Communications
Unit
Protocol
conversion
Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible
device (e.g., Servo)
CompoWay/F-
compatible
OMRON
component
CompoWay/F-
compatible
OMRON
component
Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible
device (e.g., Servo)
Protocol
conversion