K&R GT600-4T132G User Manual page 232

7. Interfaces and Communication
The frame format is described in the following table.
Frame header (START)
Slave address (ADR)
Command code (CMD)
Function code address (H)
Function code address (L)
Number of function codes (H)
Number of function codes (L)
Data (H)
Data (L)
CRC CHK high bytes
CRC CHK low bytes
END
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Greater than the 3.5-byte transmission idle time
Communication address : 1 to 247
0: Broadcast address
03:Read slave parameters
06: Write slave parameters
It is the internal parameter address of the AC drive, expressed
in hexadecimal format. The parameters include functional
parameters and non-functional parameters (running status and
running command). During transmission, low-order bytes follow
the high-order bytes.
It is the number of function codes read by this frame. If it is 1,
it indicates that one function code is read. During transmission,
low bytes follow high bytes.
In the present protocol, only one function code is read once, and
this field is unavailable.
It is the response data or data to be written. During transmission,
low-order bytes follow the high-order bytes.
It is the detection value (CRC16 verification value). During
transmission, low-order bytes follow the high-order bytes.
It is 3.5-byte transmission time.