Kruger Ecowatt K320 Series Operation Manual page 293

Ecowatt Drive K320 series
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The definition of the response information is described as follows:
"ADDR" is "01H", indicating that the message is sent from the VFD whose address is 01H. The
ADDR information occupies one byte.
"CMD" is "03H", indicating that the message is a VFD response to the 03H command from 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 "CRC low-order bit", that is, "High-order bit of data in 0004H", "Low-order bit of
data in 0004H", "High-order bit of data in 0005H", and "Low-order of data in 0005H".
A piece of data is two bytes, with the high-order bits on the left and low-order bit 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 low-order bit on the left and high-order bit on the
right.
9.4.2 Command word 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 running mode of the VFD.
For example, to write 5000 (1388H) to 0004H of the VFD whose address is 02H, the frame
structures are described in the following.
RTU master command (sent from the master to the VFD):
START
ADDR
CMD
High-order bit of data writing
address
Low-order bit of data writing
address
Data content high-order bit
Data content low-order bit
CRC low-order bit
CRC high-order bit
END
T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
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Communication
02H
06H
00H
04H
13H
88H
C5H
6EH