VP-23C - Kramer Protocol 2000
19
NOTE 3
The reply to a “REQUEST” instruction is as follows: the same instruction and input codes as were sent are returned, and
the OUTPUT is assigned to the value of the requested parameter. The reply to the instruction #5 (what is the status of
the VGA group?):
0000 0101
1000 0000
1000 0011
1000 0001
Would be:
0100 0101
1000 0000
1000 0100
1000 0001
NOTE 4
An error code is returned to the PC if an invalid code was sent to the switcher (for example, when trying to switch an
input or a group which is greater than the highest one defined). This code is also returned to the PC if an RS-232
instruction is sent while the machine is being programmed via the front panel. Reception of this code by the switcher will
not be valid.
NOTE 5
Under normal conditions, the machine’s present status is saved each time a change is made. The power-down save (the
auto save) may be disabled using this code. Note that each time that the machine is turned ON, the auto save function
is automatically set.
NOTE 6
This is a request to identify the switchers in a system. If the INPUT is set as 1 or 2, the machine will send its name. The
reply is the decimal value of the INPUT and the OUTPUT. For example, the reply to the request to send the machine’s
name (for machine #001) will be:
0111 1101
1000 0000
(i.e. 128+0)
1001 0111
(i.e. 128+23)
1000 0001
If the request for identification is sent with the INPUT set as 3 or 4, the appropriate machine will send its software
version number. Again, the reply would be the decimal value of the INPUT and OUTPUT - the INPUT representing the
number in front of the decimal point, and the OUTPUT representing the number following the decimal point. For
example, for version 3.5 the reply will be:
0111 1101
1000 0011 (i.e. 128+3)
1000 0101 (i.e. 128+5)
1000 0001
NOTE 7
GAIN VALUE – Number from 0 to 127
NOTE 8
Answer = Current Audio Gain (0 –127)
If the Audio Gain = 0, the MUTE button is illuminated
NOTE 9
When changing parameters (mix or gain), further information needed in instructions 22 and 25 is sent using instruction
42 – which is sent prior to the instruction. For example, to request the audio gain value of the master audio output
2A 80 80 81
and then send HEX codes
19 81 80 81.
To set MIX mode, send hex codes
2A
81
84
81
and then send HEX codes
16 80 81 81
