Frequency Inverter ST600 Series High-Performance Multifunction VFD Communication protocol
-286-
01H. The ADDR information occupies one byte.
The value of CMD is 03H, indicating that the message is a response of the VFD to the 03H command
of the master for reading data. The CMD information occupies one byte.
"Number of bytes" indicates the number of bytes between a 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
"LSB of CRC", that is, "MSB of data in 0004H", "LSB of data in 0004H", "MSB of data in 0005H", and
"LSB of data in 0005H".
A piece of data is two bytes, with the MSB on the left and LSB on the right. From the response, we
can see that 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.
9.4.2 Command code: 06H, writing a word
This command is used by the master to write data to the VFD. One command can be used to write
only one piece of data. It is used to modify the parameters and operation mode of the VFD.
For example, to write 5000 (1388H) to 0004H of the VFD whose address is 02H, the structure of the
frame is described in the following table.
RTU master command (transmitted by the master to the VFD)
To Next Page
Loading...
