SUNFAR Self-Defined Communication Protocol 69
E500 Series Universal Low-Power Inverter
Appendix I: SUNFAR Self-defined Communication Protocol
1.1 Overview
E500 model provides standard RS485 communication port, so users can realize
centralized monitoring
(send running command, set inverter running parameters and
read inverter working status) by PC/PLC to meet specific application requirements.
The protocol content of the appendix is designed to achieve the above functions.
1.1.1 Protocol Content
The serial communication protocol defines the transmitted information content
and applicable format in the serial communication protocol, including: main
machine polling (or broadcast) format; main machine encoding method; the
content includes the function code of the required action, data transmission and
error checking, etc. The slave machine response also employs the same structure;
the content includes action confirmation, feedback data and error checking, etc.
If slave machine goes wrong or fails to complete the required actions of man
machine when receiving information, a fault message will be organized and sent
to the main machine as response.
1.1.2 Application Scope
1. Applicable products
The series of SUNFAR inverters, e.g. C300 series, C320 series, the E500 series,
E280 series, etc. can be compatible with the communication protocols of the
other brands of inverters.
2. Applicable methods
(1) Inverter is accessed to the PC/PLC control network with “One main machine
and multiple slave machines” and RS485 bus.
(2) Inverter is accessed to the "Point-to-point" PC/PLC monitoring background
furnished with RS485 / RS232 interface (conversion interface).
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