Solar Pump Inverter Chapter 7 Communication protocol
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(communication without decimal point) (0FA0H) to F00.09H address of the inverter
whose slave address is 02H, and change the keypad set frequency to 40.00Hz.
Master command message
ADR 02H
High bit of F00.09 address 00H (Function code group)
Low bit of F00.09 address
High bit of F00.09 data 0FH
Low bit of F00.09 data A0H
Low bit of CRC CHK 5CH
Slave response message
CMD 06H
High bit of F00.09 address
00H (Function code group)
Low bit of F00.09 address 09H (Function code bit)
High bit of F00.09 data 0FH
Low bit of F00.09 data A0H
High bit of CRC CHK 73H
Check mode-CRC (Cyclical Redundancy Check) check
The checkout uses RTU frame format. The frame includes the frame error detection field
which is based on the CRC calculation method. The CRC field is two bytes including 16
figure binary values. It is added into the frame after calculated by transmitting device.
The receiving device recalculates the CRC of the received frame and compares them
with the value in the received CRC field. If the two CRC values are different, there is an
error in the communication.
Using the RTU frame format, the message includes an error detection field based on the
CRC method. The CRC field detects the contents of the entire message. The CRC field
is two bytes and contains a 16-bit binary value. It is added to the message by the
transmission device. The receiving device recalculates the CRC of the received
message and compares it with the value in the received CRC field. If the two CRC
values are not equal, the transmission has an error.
During CRC, 0*FFFF will be stored. And then, deal with the continuous 6-above bytes in
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