Appendix A Serial port 485 communication protocol
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Appendix A Serial port 485 communication protocol
A.1 Summarization
We provide general RS485/RS232 communication interface in our Inverters 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.
A.2 Protocol content and description
A.2.1 Communication net buildup mode
Fig.A-1 Net Buildup Graph
A.2.2 Communication mode
At present, EDS300 inverter can be used only as auxiliary device in 485
net.Can realize communication between inverters through PC or PLC 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) Auxiliary device report current failure information to mainframe in the last
response frame.
(5) EDS300 provides 485 interface.
Mainframe is
PC
Mainframe is
PLC
232-485conversi
on module
EDS300
EDS300
EDS300
EDS300
Or
RS232
RS485
EDS300
Mainframe
Or
ENC