SUNFAR E300 SERIES 39
AppendixⅠ: RS485 COMMUNICATION PROTOCOL
1.1 Summary
E300 series derivative models, E300B series supports standard RS485 communication
interface through PC/PLC to reach centralized monitor
（send operation order, set inverter
running parameter and read inverter running state
） to meet special using requirement. This
protocol is design for above function.
1.1.1 Protocol Content
This serial communication protocol defines transmission information and use format and it
includes master-polling (or broadcasting) format, master coding method. Content includes
function code of action, transferring data and error check. Slave response is the same structure,
and it includes action confirmation, returning data and error check etc. If slave causes any error
while receiving information or cannot finish action by master, it will send one fault signal to
master as a response.
1.1.2 Using Application
1. Suitable product
The protocol is suitable for all Sunfar product series ranges inverter（C300 series, C320 series,
E350 series, E380 series, E300 series etc.
）, which also can be suitable for communication
protocol of some other inverter brands.
2. Suitable mode
（1） Inverter connects to PC/PLC control net of “single master multi-slave” with RS485.
（2） Inverter connects to PC/PLC monitor background of “point to point” with RS485/ RS232
(transition interface).
1.2 BUS Structure and Protocol Description
1.2.1 BUS structure
1. Interface mode
RS485（RS232 for choice, but need level translator）
2. Transmission mode
Asynchronism serial and semiduplex transmission mode. At the same time, only master or only
slave can send data, and the other only can receive data. Data during serial Asynchronism
communication, it would send by a frame to a frame as form of message.
3. Topological mode
In single-master system, there are 32 sites at most, one as master site and 31 slave sites. The
setting range of slave address is 0~30, 31 (1FH) is broadcast communication address. Slave
address must be exclusive in the network. Point to point mode is a special application as single
master and multi-slaves topological mode, which is only one slave condition.
1.2.2 Protocol description
RS485 communication protocol is a kind of serial master-slave communication protocol, and
E300 Series Mini-type Integrated Universal Inverter Manual
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