Modbus Communication Protocol - SHENZHEN ENCOM ELECTRIC TECHNOLOGIES CO. enc eds800-2s0002n User Manual

10 Modbus communication protocol

10.1 Summarization
We provide general RS485 communication interface in our inverters (such as
EDS800 series, EDS1000 series and etc.) for the user. Through this communication
interface upper device (such as HMI, PC, PLC controller and etc.) can perform
centralized monitor to the inverter (such as to set inverter parameter, control run of
inverter, read work state of the inverter).
This communication protocol is interface criterion file designed for realizing
above-mentioned function, please read it earnestly and program according to it so
that realize long-distance and network control to the inverter.
10.2 Communication net buildup mode
mainframe is PC
232-485 conversion
EDS800
10.3 Communication mode
At present, EDS800 inverter can be used only as auxiliary device in RS485 net.
Can realize communication between inverters through PC, PLC or HMI if it's
needed. Specific communication mode is as mentioned below:
(1) PC or PLC as mainframe ， inverter as auxiliary device, point-to-point
communication between mainframe and auxiliary device.
(2) Auxiliary device don't response when mainframe send out command by
broadcast address.
(3) User can set local address, baud rate and data format of the inverter through
auxiliary device keypad or serial communication mode.
(4) EDS800 provides optional RS485 interface.
(5) Default mode: Asynchronous serial，semiduplex transport mode. RTU mode.
Default format and transport rate: 8-N-1, 9600bps.
EDS800 series Service Manual
RS232
module
RS485
EDS800
Fig.10-1 net buildup graph
or
mainframe is PLC
EDS1000
116
EDS1000