RS-485 Communication Features
5.2 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 converter 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.
5.2.1 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.
When wiring the communication line, make sure that the SG terminals on the PLC and inverter are
connected. SG terminals prevent communication errors due to electronic noise interference.
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