Modbus Communication Protocol
37
7 Modbus Communication Protocol
7.1 Summarization
We provide general RS485 communication interface in our inverters for the
user. This interface can communicate with upper device (such as HMI, PC, PLC
controller and etc.), To centralized monitoring to the inverter (such as to set inverter
parameter, control inverter running, read working condition of the inverter).
This communication protocol is the interface normative file designed for
realizing above-mentioned function, please read it earnestly and program according
to it
,
so that realize remote and network control to the inverter.
7.2 Networking mode for communication networking
Fig.7-1 Networking mode diagram
7.3 Communication mode
At present, EDS300 inverter can be used only as slave in RS485 network. It
Can realize communication between inverters through PC, PLC or HMI if it’s
needed. Specific communication mode as belows:
(1) PC or PLC as mainframe, Inverter as slave, point-to-point communication
between main and slave device.
(2) Slave device don’t response when mainframe send out command in
broadcast address.
(3) User can set local address, Baud rate and data format of the inverter through
keypad of slave device.
(4) EDS300 provides optional RS485 interface.
(5) Default mode: Asynchronous serial
,
semiduplex transport mode. RTU
mode.
Default format and transport rate: 8-N-1, 9600bps.
Mainframe is PC
Mainframe is PLC
EDS300
EDS300
EDS300
EDS300
or
RS232
RS485
232-485conversion
module
ENC