7.2 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-
232converter must be integrated with the computer, so that it can communicate with
the inverter through the RS-232/RS-485 converter. 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.
7.2.1 Communication Line Connection
After checking that the power of the inverter is fully blocked, connect the RS-485
communication line to S+ or S-terminal of the control terminal or RJ45 connector (no.1
pin S+, no.8 pin S-) of the I/O board. 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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