### Setting of External Device

Click the [Serial Port] tab from the [PLC System Settings] of the ladder software for the communication settings of the Serial port (Serial Port on CPU) and set as below.

Setup Items | Setup Description
--- | ---
Communications Settings | Custom
Baud | 19200
Format | 8,1,E
Mode | Modbus RTU Slave
Modbus Slave Address | 1

Set the value of the DIP Switch on the rear of the Option Board as shown in the table below.

DIP Switch No. | Set Value
--- | ---
1 | ON
2 | ON
3 | ON
4 | OFF
5 | OFF
6 | ON

NOTE

- Do not set the duplicate node address in the same network address group.

- Use an integer from 1 to 247 to enter the unit ID of the External Device.