Kaiterra Sensedge Mini Installation Manual page 11

C. Set up Modbus via RS-485
To set up Modbus communication, connect your cable from the RS-485
network to the 4-pin Phoenix pin plug on the power source. Check the "A"
"B" marks on the back of the device to make sure the cables are connected
in the right order, and fasten the screws on the Phoenix pin plug to secure
the cables.
Plug the 4-pin Phoenix pin plug into the corresponding terminals on the
back of the device.
The default Modbus address is set as 1, and can be changed later via the
Kaiterra Configuration Tool.