4-82
Modbus (RS-485) communication specification:
Items
Specification
Interface
RS-485
Communication type
Asynchronous (start - stop synchronization)
Communication parameters
Baud rate: 4800, 9600, 19200 and 38400 bps
Data Length: 7 or 8 bits
Parity: options of none, even and odd bit.
For even and odd selection stop bit is fixed at 1 bit.
Communication protocol
Modbus RTU / ASCII
Number of inverters
Maximum 32 units
Communication wiring and setup
(1) Turn off power to the inverter.
(2) Connect communication lines of the controller to the inverter (RJ45).
(3) Turn power on.
(4) Set the required communication parameters (09-00) via the keypad.
(5) Turn off power to the inverter and wait until keypad is completely off.
(6) Turn power on
(7) 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
312 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.
(3) A maximum 32 inverters can be connected to a network, following the Modbus communication standard.
Communication Parameters:
09-00:
Inverter station addresses: Range 1-32
09-02:
RS-485 communication baud rate setting
= 0: 4800 bps
= 1: 9600 bps
= 2: 19200 bps
= 3: 38400 bps
09-03:
Stop bit selection
= 0: 1 stop bit
= 1: 2 stop bits
09-04:
Parity selection of RS-485 communication
= 0: No parity.
= 1: even parity.
= 2: odd parity.
09-06:
RS-485 communication error detection time
