Modbus‑TCP Communication Protocol
‑18‑
Table 3–1 Description of data frame fields
Command CMD 03: Read slave parameters; 06: Write slave parameters; 10: Multi‑write slave
parameters
Function code address 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.
Number of function codes Number of parameters read in this frame. If it is 1, it indicates reading one
parameter. During transmission, low‑order bytes follow the high‑order bytes. In
the present protocol, only one parameter is read once, and this field is
unavailable.
Number of data bytes The data length is twice the number of parameters.
Parameter Response data or data to be written. During transmission, low‑order bytes follow
high‑order bytes.
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