10.2 Communication System Configuration
In an RS-485 communication system, the PLC or computer is the master device and the inverter
is the slave device. When using a computer as the master, the RS-232/RS-485 converter must be
integrated with the computer, so that it can communicate with the inverter. Specifications and
performance of converters may vary depending on the manufacturer, but the basic functions are
identical. Please refer to the converter manufacturer’s user manual for details about features and
specifications.
Connect the wires and configure the communication parameters on the inverter by referring to the
following illustration of the communication system configuration.
10.2.1 Communication Line Connection
Make sure that the inverter is turned off completely, and then connect the RS-485 communication
line to the S+/S-/SG terminals of the terminal block. The maximum number of inverters you can
connect is 16. For communication lines, use shielded twisted pair (STP) cables.
The maximum length of the communication line is 1,200 meters, but it is recommended to use no
more than 700 meters of communication line to ensure stable communication.
Please use a repeater to enhance the communication speed when using a communication line
longer than 1,200 meters or when using a large number of devices. A repeater is effective when
smooth communication is not available due to noise interference.
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