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HP High-Definition LCD TV Service Manual 31
Return messages
For
every
command,
TV
should
return
reply.
Controller
wait
s
before
sending
another
command because
some
commands
take
time
before
TV
is
ready
to
accept
next
command.
For
example,
the
“channel
scan” command
takes
minutes.
For
Normal
Response
O
K
CR
CR : Carriage Return (0Dh)
For Error condition:
E R R CR
CR : Carriage Return (0Dh)
Special command extension
CONTROL
ITEM
Command
PARAMETER
Parameter
Return
Data
0
_
_
_
Power
0:
Off
(return
from
MCU),
1:
On
1
_
_
_
Mute
0:
Off,
1:
On,
2:
On
Mute
2
Volume
Current
Volume
level:
0
~
100
(ASCII
format)
3
CH
(major)
0
~
9999
(e.g.)
Ch
99
:
0099,
Ch
9
:
0009
in
ASCII
)
4
CH
(minor)
0
~
9999
(e.g.)
Ch
99
:
0099,
Ch
9
:
0009
in
ASCII
)
5
Caption
0:
Off,
1:
On
6
Input
source 0
~
8
:
(TV
Air/Cable,
AV1,
AV2,
YPbPr1,
YPbPr2, VGA, HDMI1,
HDMI2,
HDMI3
)
7
Aspect
0:
Auto,
1:
(16:9),
2:
(4:3),
3:
(Zoom1),
4:
(
Zoom2
)
, 5:
(
Panorama
)
8
Brightness
0
~
100
(e.g.
7
->
0007,
77
->
0077)
in
ASCII
9
Contrast 0
~
100
(e.g.
7
->
0007,
77
->
0077)
in
ASCII
A
Sharpness
0
~
100
(e.g.
7
->
0007,
77
->
0077)
in
ASCII
B
Color
0
~
100
(e.g.
7
->
0007,
77
->
0077)
in
ASCII
GET
STATUS
(Return
current
TV
status
value)
G
S
T
C
Hue
0
~
100
(e.g.
7
->
0007,
77
->
0077)
in
ASCII
Get
Status
RETURN
message
format
for
“GST”(Get
Statue)
command:
?
O
K
W
X
Y
Z
CR
0
0
0
0
Format
of
WXYZ (always
4
bytes):
For
all
return
values:
(add
prefix
with
0s,
right
justify).
If
volume
is
89,
return
value
will
be
0089
(add
‘00’).
If
channel
is
7,
return
value
will
be
0007
(add
‘000’).
If
Mute
is
1,
return
value
will
be
0001
(add
‘000’).