Chapter 7 EH600 Communication Protocol
and Description of Communication
In the EH600 series inverters , we will provide RS485 communication interface (when the host computer
is RS232, you can choose and buy RS485/232 adapter of our computer to transform signal at the same time ). User may realize
centralized control (set inverter running command , function code parameter , read the work status and fault information of
inverter ) by PC or PLC to adapt specific usage.
interface of the
required
The serial communication protocol defines the transmission information and use format in the series communication.
It includes host-polling (or broadcasting) format , host coding method and the content are function code of action,
transferring data and error checking. The response of slave adopts the same structure , and it includes action affirmance,
returning and error checking. If slave made mistakes while it is receiving the information or cannot finish the action
demanded by the host, it will send one fault signal to the host as a response.
When the host computer adapts broadcast address , all slave computers receive the data from the host computer, but no
response will made to host computer .
data
Inverter will be connected into a Single-host Multi-slave PC/PLC control net with RS485 bus .“”
EH600 series inverter communication protocol is a kind of serial host-slave communication protocol. In the network ,
only one equipment, the host, can build a protocol , (Named as "Inquiry/Command"). Other equipments , slaves, response
"Inquiry/Command" of the host only by providing the data or take the action according to the host.
Here , the host is a Personnel Computer, Industrial Machine or Programmable logical controller , and the slave is inverter.
Host not only can communicate with certain slave separately, but also can send the broadcast information to all the slaves.
For the single inquired "Inquiry/Command" of the host, all the slaves should return a signal(a response) ; for the broadcast
information provided by the host, slaves need not to feedback a response.
"Inquiry/Command" of
Asynchronous serial and half-duplex transmission mode.
at the same time. In the series asynchronous communication , the data is sent out
frame by frame in the form of message .
Just one can send the data and the other receives the
data between the host and the slave
Single host computer multi-slave computer system . The slave address is1to 247, zero is broadcast
communication address. The address of the slave must be exclusive.
setup range of
in the network
RS485 hardware interface
（）1 Interface Mode
（）2 Transmission Mode
（）3 Topological Structure
Communication protocol of EH600 is completely compatible with standard communication protocol of , meanwhile ,
according to the client, the protocol added accumulation check mode and complex command mode to
enrich the client.
Modbus
applied requests from
programme choice of
、
7.1
1. Protocol contents
2. Application Mode
3. Bus Structure
4. Protocol Specification
EH600 serial communication protocol
69
By using RTU mode, there are at least 3.5-byte startup interval time between data frames .The first field transferred
is equipment address , the that can be used is 0 to 9 and A to F of hex .The net equipment senses the network bus
and the pause interval time . When receiving
character
continuously the first field (means address message ) , every equipment is
decoding to judge whether the message is sent to it. When the last character is transmitted, there is a similar 3.5-byte
interval time to demarcate that the frame is finished.
The Modbus protocol data format of EH600 series inverter is as following ：
5. Communication Structure
Chapter 7 EH600 Communication Protocol and Description of Communication
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