94 SUNFAR C300
C300 series of non-sensor current vector-control inverter manual
Appendix RS485 COMMUNICATION PROTOCOLⅠ
1． Summary
C300 series of inverter provides RS485 interface, users can carry out centralized
monitoring through PC/PLC to get operating requirements. The protocol in this
appendix is designed for the above functions.
1.1. About protocol
This serial communication protocol defines the transmission information and use
format in the series communication and it includes master-polling (or broadcasting)
format, master coding method and the content includes function code of action,
transferring data and error checking. The response of slave is the same structure,
and it includes action confirmation, returning the data and error checking etc. If
slave takes place the error while it is receiving the information or cannot finish the
action demanded by master, it will send one fault signal to master as a response.
1.2. Application scope
1.2.1. Application products
The protocol is fit for all sunfar series of inverters, for example C300, C320, E380
series of inverter, and some other inverters.
1.2.2. Application methods
（1） The inverter will be connected into a “Single-master Multi-slave ” PC/PLC
control net with RS485 bus.
（ 2） The inverter will be connected into a “Point to Point” PC/PLC monitor
background.
2． BUS structure and protocol description
2.1. BUS structure
（1）Interface mode
There provide RS485 interface and RS232 interface, but RS232 interface need the
level translation accessories.
（2）Transmission mode
There provide asynchronous series and half-duplex transmission mode. At the
same time, just one can send the data and the other only receives the data between
master and slave. In the series asynchronous communication, the data is sent out
frame by frame in the form of message.
（3）Topological mode
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