Command Code 06H, Writing A Word; Command Code 08H, Diagnosis - INVT Goodrive3000 Series Operation Manual

Goodrive3000 series medium voltage VFD
one byte.
"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 "CRC LSB", 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 contains two bytes, with the MSB on the left and LSB 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 LSB on the left, and MSB on the right.

8.4.2 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 running mode of the VFD.
For example, to write 5000 (1388H) to 0004H of the VFD whose address is 02H, the frame structure is as follows.
RTU master command (from the master to the VFD)
MSB of data writing address
LSB of data writing address
MSB of to-be-written data
LSB of to-be-written data
RTU slave response (from the VFD to the master)
MSB of data writing address
LSB of data writing address
MSB of to-be-written data
LSB of to-be-written data
Note: The sections 8.4.1 and 8.4.2 mainly describe the command formats. For the detailed application, see the examples
in section 8.4.7.

8.4.3 Command code 08H, diagnosis

Sub-function code description:
For example, to query about the circuit detection information about the VFD whose address is 01H, the query and return
strings are the same, and the format is described as follows.
RTU master command
START
ADDR
CMD
CRC LSB
CRC MSB
END
START
ADDR
CMD
CRC LSB
CRC MSB
END
Sub-function code
0000
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Returned data based on query information
-198-
Moudbus protocol
02H
06H
00H
04H
13H
88H
C5H
6EH
02H
06H
00H
04H
13H
88H
C5H
6EH
Description