9
5.2.
Message type
5.2.1. Get current Parameter from a monitor.
Send this message when you want to get the status of a monitor.
For the status that you want to get, specify the
“
OP code page
”
the
“
OP code
”
, refer to
5.3.1.
“
VCP (OP code page/OP code) List
”
.
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) OP code page: Operation code page.
Specify the
“
OP code page
”
for the control which you want to get the status.
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
for each item.
OP code page data must be encoded to ASCII characters.
Ex.) The byte data 02h must be encoded to ASCII characters '0' and '2' (30h
and 32h).
OP code page 02h ->
OP code page (Hi) = ASCII '0' (30h)
OP code page (Lo) = ASCII '2' (32h)
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
.
4
th
–
5
th
bytes) OP code: Operation code
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
for each item.
OP code data must be encoded to ASCII characters.
Ex.) The byte data 3Ah must be encoded to ASCII characters '3' and 'A' (33h and 41h).
OP code 3Ah ->
OP code (Hi) = ASCII '3' (33h)
OP code (Lo) = ASCII 'A' (41h)
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
.
6
th
byte) ETX: End of Message
ASCII ETX (03h)
5.2.2. "Get parameter" reply
The monitor replies with a current value and the status of the requested item (operation code).
1
st
byte) STX: Start of Message
ASCII STX (02h)
2
nd
-3
rd
bytes) Result code.
These bytes indicate a result of the requested commands as follows,
00h: No Error.
01h: Unsupported operation with this monitor or unsupported operation under current
condition.
This result code from the monitor is encoded to ASCII characters.
Ex.) The byte data 01h is encoded to ASCII character '0' and '1' (30h and 31h).
4
th
–
5
th
bytes) OP code page: Operation code page.
These bytes indicate a replying item's OP code page.
This returned value from the monitor is encoded to ASCII characters.
Ex.) The byte data 02h is encoded to ASCII character '0' and '2' (30h and 32h).
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
.
6
th
–
7
th
bytes) OP code: Operation code
These bytes indicate a replying item's OP code.
This returned value from the monitor is encoded to ASCII characters.
Refer to 5.3.1.
“
VCP (OP code page/OP code) List
”
.
Ex.) The byte data 1Ah is encoded to ASCII character '1' and 'A' (31h and 41h).
OP code page
OP code
STX
Hi
Lo
Hi
Lo
ETX
1
st
2
nd
-3
rd
4
th
–
5
th
6
th
Result
OP code page
OP code
Type
Max value
Current Value
STX
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo MSB
LSB MSB
LSB
ETX
1
st
2
nd
-3
rd
4
th
–
5
th
6
th
–
7
th
8
th
-9
th
10
th
-13
th
14
th
-17
th
18
th
