INVT 11020-00136, Operation Manual

Page: 131 / 424

Goodrive600 series high-performance multifunction VFD Communication networking
-123-
"ADDR" is "01H", indicating that the message is sent from the VFD whose address is 01H. "ADDR" occupies one byte.
"CMD" is "03H", indicating that the message is a VFD response to the 03H command from the master for reading data.
"CMD" 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.
6.3.3.2 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 T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
ADDR 02H
CMD 06H
High-order bit of data writing address 00H
Low-order bit of data writing address 04H
Data content high-order bit 13H
Data content low-order bit 88H
CRC low-order bit C5H
CRC high-order bit 6EH
END T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
RTU slave response (sent from the VFD to the master):
START T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
ADDR 02H
CMD 06H
High-order bit of data writing address 00H
Low-order bit of data writing address 04H
Data content high-order bit 13H
Data content low-order bit 88H
CRC low-order bit C5H
CRC high-order bit 6EH
END T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
6.3.3.3 Command code 08H, diagnosis
Sub-function code description:
Sub-function code Description
0000 Return data based on query requests
For example, to query about the circuit detection information about the VFD whose address is 01H, the query and return