SUNFAR Self-Defined Communication Protocol 73
E500 Series Universal Low-Power Inverter
1. Command frame of main machine
Sending sequence
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Frame header
Slave address
Slave address
Command classification
Operation command
Operation command
Data classification
Data address
Data address
Setting Data
Setting Data
Setting Data
Setting Data
Checksum
Checksum
Checksum
Checksum
Frame end
Define
Station
address
Command
area
Address area Data area Check area 0DH
2. Response frame of slave machine
General description of data definition in data frame
(1) Frame header
The communication protocol specifies that “2AH” (refers to ASC II code of
character “*”) and “5AH” are valid frame header. When frame header is “2AH”,
all data following frame header is default as ASC II character; when frame
header is “5AH”, all data following frame header is default as hexadecimal
value and the redundant invalid bytes are filled with “0”. Independent “2AH” or
“5AH” cannot be identified as valid frame header, a waiting time of more than 5
transmission bytes must be guaranteed in advance, which is considered as the
starting condition of forming one frame data.
(2) Slave address
The setting range of inverter local address is 0～30 and 31(1FH) is broadcast
communication address.
Sending sequence
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Frame header
Slave address
Slave address
Slave machine response
Status feedback
Status feedback
Data classification
Data address
Data address
Running data
Running data
Running data
Running data
Checksum
Checksum
Checksum
Checksum
Frame end
Define
Station
address
Response
area
Address
area
Data area Check area 0DH
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