4-170
controller uses RTU format, it can not support communication data bit of 7 bit data. (09-05=1).
Modbus (RS-485) communication specification：
Items Specifications
Interface RS-485
Communication period Asynchronous (start - stop synchronization).
Communication parameters
Baud rate：4800, 9600, 19200 and 38400 bps.
Data Length：8 bits (Fixed).
Parity：options of none, even and odd bit.
For even and odd selection stop bit is fixed at 1 bit.
Communication protocol Modbus (included RTU mode and ASCII mode).
Number of inverters Maximum 31 units.
Please refer the detail instruction to “Appendix 3-Modbus”.
Commnuication wiring and setup
(1) Turn off power supply and connect communication lines of the controller to the inverter (RJ45).
(2) Turn power on.
(3) Set the required communication parameters (09-00) via the keypad.
(4) Turn off power to the inverter and wait until keypad is completely off.
(5) Turn power on again.
(6) Start communication between controller and inverter.
Modbus (485) communication architecture
(1) Modbus communication configuration uses a master controller (PC, PLC), communicating to a
maximum of 31 inverters.
(2) The master controller is directly connected to the inverter via the RS-485 interface. If the master
controller has a RS-232, a converter must be installed to convert signals to RS-485 to connect
the master controller to the inverter.
A maximum 31 inverters can be connected to a network, following the Modbus communication
standard. Communication parameters as follows：
Inverter station addresses(09-00)
Setting range is 1-31.
RS-485 Communication baud rate setting(09-02)
09-02= 2：4800 bps (bit/second)
09-02= 3：9600 bps
09-02= 4：19200 bps
09-02= 5：38400 bps
Stop bit selection(09-03, 09-04)
09-03= 0：1 stop bit
09-03= 1：2 stop bits
09-04= 0：No parity.
09-04= 1：even parity
09-04= 2：odd parity.
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