INVT GD20-0R4G-2-UL, Operation Manual

Page: 127 / 160

Goodrive20-UL Series VFD Communication protocol
-122-
Low bit of data
content
88H
CRC CHK low bit C5H
CRC CHK high bit 6EH
END T1-T2-T3-T4
Note: Sections 7.3.1 and 7.3.2 mainly describe the command formats.
7.3.3 Command code 08H, diagnosis
Meaning of sub-function codes
Sub-function Code Description
0000 Return to inquire information data
For example: The inquiry information string is the same as the response information string
when the loop detection to address 01H of driver is carried out.
The RTU request command is:
START T1-T2-T3-T4
ADDR 01H
CMD 08H
High bit of sub-function
code
00H
Low bit of sub-function
code
00H
High bit of data content 12H
Low bit of data content ABH
CRC CHK low bit ADH
CRC CHK high bit 14H
END T1-T2-T3-T4
The RTU response command is:
START T1-T2-T3-T4
ADDR 01H
CMD 08H
High bit of sub-function
code
00H
Low bit of sub-function
code
00H
High bit of data content 12H
Low bit of data content ABH