Shenzhen Hpmont Technology Co., Ltd
Appendix B Communication Protocol
HD20 Series Inverters User Manual
－
157
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Subfunction
code
Data (command)
Data (response)
Subfunction meanings
group no. occupies the
higher byte, and the
lower byte is “00”.
no. occupies the higher byte,
and the lower byte is “00”.
parameter group no.
0x0005
The function parameter
group no. occupies the
higher byte, and the
lower byte is “00”.
Previous function parameter
group no. occupier the higher
byter, and the lower byte is
“00”.
To read previous function
parameter group no.
0x0006
0x3300
The status parameter index at
current displaying.
To read status parameter
index at current display.
0x0007
0x3300
The parameter index at next
status.
To display next status
parameter.
0x0008
The parameter group no.
and intergroup index
occupy the higher and
lower bytes respectively.
Factory default.
To read factory default of
function parameter.
(Unsupported this operation in
status and control
parameters)
The function parameter characteristics are 2-byte, with definition shown as below:
Characteristics (Bit)
Value
Definition
Bit0
0B
To modify the upper limit as per character restriction.
1B
To modify the upper limit as per 4-byte restriction.
Bit2
－
Bit1
00B
without decimal fraction
01B
1 decimal fraction
10B
2 decimal fraction
11B
3 decimal fraction
Bit5
－
Bit3
001B
To display length 1
010B
To display length 2
011B
To display length 3
100B
To display length 4
101B
To display length 5
Reserved
Bit7
－
Bit6
00B
Actual parameters, unchangeable
01B
Changeable
10B
Unchangeable in running status
11B
Set by the manufacturer. The users are not allowed to
make any modification.
Bit12
－
Bit8
00000B
Without char
00001B
Unit is Hz
00010B
Unit is A
00011B
Unit is V
00100B
Unit is rpm
00101B
Unit is %
Reserved
B