Sinee A90-4T032B - 12.3.5 Definition of frame data length

User Manual of A90 Series Inverter
287
7228H
Cumulative power-on time
7230H
Warning
number
0: no warning; others: current warning sign
Other - 73FFH
Reserved
Product
informati
on
7500H
~
75FFH
7500H
Performance software S/N
1
Corresponding to the function code
F12.22
7501H
Performance software
S/N2
Corresponding to the function code
F12.23
7502H
Functional software S/N 1
Corresponding to the function code
F12.24
7503H
Functional software S/N 2
Corresponding to the function code
F12.25
7504H
Keyboard software serial
number 1
Corresponding to the function code
F12.26
7505H
Keyboard software serial
number 2
Corresponding to the function code
F12.27
7506H
Serial No. 1
Corresponding to the function code
F12.28
7507H
Serial No. 2
Corresponding to the function code
F12.29
7508H
Serial No. 3
Corresponding to the function code
F12.30
7509H to
75FFH
Reserved
Others
Reserved
12.3.5 Definition of frame data length
The PDU part of the RTU frame of the MODBUS message is able to read/write 1-16
registers. For different function codes, the actual length of the RTU frame varies, as
detailed in Table 0-3.
Table 0-3 Correspondence between RTU Frame Length and Function Code
Function code
(0x)
RTU frame length (bytes)
Maximum length
(Byte)
Request
Normal response
Exception
response
03
8
5+2N
r
[4
]
5
37
41 (06)
8
8
5
8
08
8
8
5
8
42 (10)
9+2N
w
[5]
8
5
41