TECHTOP TD20 Series Product Manual page 104

TD20 Series VFD
CRC CHK high bit
END
RTU slave response message (from the VFD to the master)
START
ADDR
CMD
High bit of writing data address
Low bit of writing data address
High bit of data content
Low bit of data content
CRC CHK low bit
CRC CHK high bit
END
Note: section 10.2 and 10.3 mainly describe the command format, and the detailed application will be
mentioned in 10.8 with examples.
7.3.3 Command code 08H for diagnosis
Meaning of sub-function codes
Sub-function Code
0000
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
ADDR
CMD
High bit of sub-function code
Low bit of sub-function code
High bit of data content
Low bit of data content
CRC CHK low bit
CRC CHK high bit
END
The RTU response command is:
START
ADDR
CMD
High bit of sub-function code
Low bit of sub-function code
High bit of data content
6EH
T1-T2-T3-T4
T1-T2-T3-T4
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4
Description
Return to inquire information data
T1-T2-T3-T4
01H
08H
00H
00H
12H
ABH
ADH
14H
T1-T2-T3-T4
T1-T2-T3-T4
01H
08H
00H
00H
12H
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Communication Protocol