Command Code 08H, Diagnosis - Kruger Ecowatt Drive K120 Series Operation Manual

Ecowatt ® Drive K120 series
For example, to write 5000 (1388H) to 0004H of the VFD whose slave 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 CHK low-order
bit
CRC CHK high-order
bit
END
Note: Sections 7.3.1 and 7.3.2 mainly describe the command formats.

7.3.3 Command code 08H, diagnosis

Sub-function code description:
Sub-function code
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 formats are described
in the following tables.
RTU master command
START
ADDR
CMD
Sub-function code
high-order bit
Sub-function code
low-order bit
T1-T2-T3-T4
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4
0000
T1-T2-T3-T4
01H
08H
00H
00H
RTU slave response (sent from the VFD to
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 CHK low-order
bit
CRC CHK high-order
bit
END
Return data based on query requests
RTU slave response
START
ADDR
CMD
Sub-function code
high-order bit
Sub-function code
low-order bit
-133-
Communication protocol
the master)
T1-T2-T3-T4
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4
Description
T1-T2-T3-T4
08H
00H
00H
01H