SD1 Series Inverters Communication Protocol
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and ADDR occupies one byte
CMD=03H means the message is received from the inverter to the master for the response of
reading command and CMD occupies one byte
"Byte number" means all byte number from the byte (excluding the byte) to CRC byte
(excluding the byte). 04 means there are 4 byte of data from the "byte number" to "CRC CHK
low bit", which are "digital address 0004H high bit", "digital address 0004H low bit", "digital
address 0005H high bit" and "digital address 0005H low bit".
There are 2 bytes stored in one data with the fact that the high bit is in the front and the low bit
is in the behind of the message, the data of data address 0004H is 1388H, and the data of
data address 0005H is 0000H.
CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the
behind.
7.3.1.2 Command code: 06H
06H (correspond to binary 0000 0110), writing a word
The command means the master writes data to the inverter and one command can write one
data only. It is used to change the parameter and working mode of the inverter.
For example, write 5000 (1388H) to 0004H from the inverter with the address of 02H, the
frame structure is as follows:
RTU master command message (from the master to the inverter)
High bit of writing data address
Low bit of writing data address
RTU slave response message (from the INVERTER to the master)
High bit of writing data address
Low bit of writing data address
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