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Appendix 3 Serial port RS485 communication protocol
(need customized special process)
1.1 Summarization
We provide general RS485/RS232 communication interface in our Inverters
(such as EDS1000 series, EDS2000 series, EDS2800 series, etc.) for the user.
Through this communication interface upper device (such as PC, PLC controller
etc.) can perform centralized monitor to the inverter (such as to set inverter
parameter, control run of inverter, read work state of the inverter) and also
long-distance control keypad can be connected to realize various usage
requirement of the user.
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.
1.2 Protocol content and description
1.2.1 Communication net buildup mode
Fig.1 net buildup graph
1.2.2 Communication mode
At present, EDS1000 inverter can be used not only as auxiliary device but also
mainframe device in RS485,if the inverter used as auxiliary ddevice,master
device can be completed by PC,PLC or human interface,and if used as
mainframe device ,the main- auxiliary control of the inverter can be complement
by it, 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.
EDS1000 mainframe
mainframe is PC
mainframe is PLC
232-485 conversion
module
EDS1000 EDS1000 EDS800 EDS800
or
RS232
RS485
or