INVT SP100 Series User Manual page 91

SP100 series solar pump inverter
01H. "ADDR" occupies one byte.
"CMD" is "03H", indicating that the message is an inverter response to the 03H command
from the master for reading data. "CMD" occupies one byte.
"Number of bytes" indicates the number of bytes between the byte (not included) and
the CRC byte (not included). The value "04" indicates that there are four bytes of data
between "Number of bytes" and "CRC LSB", that is, "MSB of data in 0004H", "LSB of data
in 0004H", "MSB of data in 0005H", and "LSB of data in 0005H".
A record of data contains two bytes, with the MSB on the left and LSB on the right. From
the response, the data in 0004H is 1388H, and that in 0005H is 0000H.
CRC check occupies two bytes, with the LSB on the left, and MSB on the right.
7.3.3.2 Command code 06H, writing a word
This command is used by the master to write data to the inverter. One command can be
used to write only one piece of data. It is used to modify the parameters and running
mode of the inverter.
For example, if the master writes 5000 (1388H) to 0004H of the inverter whose address is
02H,
RTU master command (from the master to the inverter)
MSB of data writing address
LSB of data writing address
MSB of data content
LSB of data content
RTU slave response (from the inverter to the master)
MSB of data writing address
LSB of data writing address
MSB of data content
LSB of data content
202501 (V1.1)
START
ADDR
CMD
CRC LSB
CRC MSB
END
START
ADDR
CMD
CRC LSB
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Communication
02H
06H
00H
04H
13H
88H
C5H
6EH
02H
06H
00H
04H
13H
88H
C5H
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