Panasonic GM1 User Manual page 558

13.3 MODBUS
5.
Right-click the "Modbus_Master_COM_Port" object in the navigator pane and then select
Add Device from the context-sensitive menu that is displayed.
The "Add Device" dialog box will be displayed.
6.
Select "Modbus Slave, COM Port" under "Modbus Serial Slave" and click the [Add Device]
button.
The "Modbus_Slave_COM_Port" object will be added below the
"Modbus_Master_COM_Port" object.
7.
Double-click "Modbus_COM" in the navigator pane.
The "Modbus_COM" object will be displayed.
Select the "General" tab and set appropriate values for each item.
Item
COM port
13-32
Description
Settable value: 1 to 99
The COM port of the GM1 controller is fixed at 1.
WUME-GM1RTXOP-01