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. Modbus (RS-485) communication specifications are as following.
Items Specification
Interface RS-485
Communication cycle
Asynchronous (start - stop
synchronization)
Communication parameters
Select Baud rate: 1200, 2400, 4800,
9600, 19200 and 38400 bps
Data Length: fixed 8 bits
Parity: options of no even and oddbits,
even bit or odd bid.
Stopt bit: fixed 1 bit
Communication protocol
Modbus (including RTU mode and
ASCII mode).
Number of inverter Maximum 31 units
.Communication procedures and controller
(1) Turn off the power supply and connect communication lines of the controller
and inverter.
(2) Turn on the power supply.
(3) Set the required communication parameters (09-00) by the use of digital
operator.
(4) Turn off the power supply,check the digital operator and make sure the display
completely disappears.
(5) Turn on the power again.
(6) Communicate with the controller
.
. Modbus (485) communication architecture
（1）Modbus communication configuration uses a master controller (PLC), and the
serial communication of the maximum 31 client controllers.
（2） The master controller is directly connected to the inverter by RS-485 interface
for communication. If the master controller does not provide a RS-485
connector, a RS-232 converter card can be used to connect the master
controller and the inverter unit.
(3) Modbus can control maximum 31 sets of inverter, following the Modbus
communication standard.
. Parameters are defined as following:
（1）Inverter station address (09-00).
‧Inverter address’s setting range 1-31
（2）RS-485 communication Baud rate setting (09-02).
‧09-02= 0: 1200 bps (bits / second)
= 1: 2400 bps
= 2: 4800 bps
= 3: 9600 bps
= 4: 19200 bps
= 5: 38400 bps
（3）Parity selection of RS-485 communication（09-03, 09-04）
‧09-03 = 0: 1 stop bit
= 1: 2 stop bits
‧09-04 = 0: No parity.
= 1: even parity.
= 2: odd parity.
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