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Appendix B Communication Protocol
ED2000 series inverter provides RS232 / RS485 communication interface, and support the Modbus communication protocol. Users
can be achieved by computing machine or PLC central control, through the communication protocol set inverter running
commands, modify or read function code parameters, read the inverter wor1<ing condition and fault information, etc.
1.
The agreement content
The serial communication protocol defines the serial communication transmission of information content and format. Including:
host polling or wide planting format; Host encoding method, the content includes: the function of the required action code, data
transmission and e1TOr checking, etc. From the ring of machine should be used is the same structure, content including: action
confirmation, return the data and error checking, etc. If there was an e1TOr in receiving information from a machine, or cannot
achieve the requirements of the host, it will organize a fault feedback information in response to the host.
2.
Application methods
Application mode inverter with RS232 / RS485 bus access to the "from" single main PC/PLC control network.
3.
Bus structure
(1)
The interface way RS232 / RS485 interface hardware
(2)
Asynchronous serial transmission mode, half-duplex transmission mode. At the same time the host and the only one to
send data from the machine and the other can only receive data. Data in the process of serial asynchronous communication, the
form of a message, a frame of a frame to send
(3)
Topological structure from single host machine system. From the machine address set in the range of 1 ~ 247, 0 for
broadcast communication address. In the network from the machine address must be unique.
4.
Protocol Description
ED2000 series inverter is a kind of asynchronous serial port communication protocol of master-slave Modbus communication
protocol, the network has only one equipment (host) to establish agreement (called "query/command").other equipment
(machine) can only by providing data response of the main machine "query/ command", or "query/command" according to the
host to make the corresponding action. Host in this refers to the personal computer (PC), industrial control equipment or
programmable logic controller (PLC), etc., from machine refers to ED2000 inverter. The host can communicate to a separate from
the machine, also can to all under a broadcast information from machine release. For access to the host alone "query/command",
from the machine to return to a information (called response), for radio host information, from the machine without feedback
response to the host.
5.
Communications data structure
Communication data structure ED2000 series inverter of the Modbus protocol communication data format is as follows: using the
RTU mode, messages are sent at least begin with 3.5 characters pause time interval.
In network wave rate under varied characters of the time, this is the most easy to implement (below T1, T2, T3, T4).Transmission
equipment is the first domain address.
The transmission character of you can use is the hex 0... 9, A...F. Continuously detect network bus network facilities, including
pause interval of time. When the first domain (domain) to receive, every equipment decoding to determine whether to own. After
the last transmission character, a pause at least 3.5 characters time calibration for the end of the message. A new message can be
started after the pause.
The entire message frame must be as a continuous flow of transmission. If the time frame to complete more than 1.5 characters
before pause time, receiving equipment will refresh incomplete
Summary of Contents for elmatic ED2000
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