SUNFAR Self-Defined Communication Protocol 69
Appendix I: SUNFAR Self-defined Communication Protocol
1.1 Overview
E550 model provides standard RS485 communication port, so users can realize centra-
lized 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 E550 series,
E380 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/PL monitoring background
furnished with RS485 / RS232 interface (conversion interface).
E550 Series Universal Low-Power Inverter
