Communication Protocol
27
27
Table 8: Instruction Codes
INSTRUCTION
DEFINITION FOR SPECIFIC INSTRUCTION
NOTE
#
DESCRIPTION
INPUT
OUTPUT
0
RESET VIDEO
0
0
1
1
SWITCH VIDEO
Set equal to video input which
is to be switched
(0 = disconnect)
Set equal to video output
which is to be switched
(0 = to all the outputs)
2
2
SWITCH AUDIO
Set equal to audio input which
is to be switched
(0 = disconnect)
Set equal to audio output
which is to be switched
(0 = to all the outputs)
2
5
REQUEST STATUS OF A
VIDEO OUTPUT
Set as SETUP # 0
Equal to output number
whose status is reqd
4, 3
6
REQUEST STATUS OF AN
AUDIO OUTPUT
Set as SETUP # 0
Equal to output number
whose status is reqd
4, 3
8
BREAKAWAY SETTING
0
0 - audio-follow-video
1 - audio breakaway
2
11
REQUEST BREAKAWAY
SETTING
Set as SETUP # 0, or
set to 126 or 127 to request if
machine has this function
0 - Request audio breakaway
setting
3, 4, 6
12
REQUEST VIDEO / AUDIO
TYPE SETTING
Set as SETUP # 0, or
set to 126 or 127 to request if
machine has this function
0 - for video
1 - for audio
3, 4, 6
16
ERROR / BUSY
0
0 - error
1 - invalid instruction
2 - out of range
9
18
RESET AUDIO
0
0
1
30
LOCK FRONT PANEL
0 – Panel unlocked
1 - Panel locked
0
2
31
REQUEST WHETHER PANEL
IS LOCKED
0
0
16
57
SET AUTO-SAVE
0 – no save
1 - auto-save
0
12, 2
61
IDENTIFY MACHINE
1 - video machine name
2 - audio machine name
3 - video software version
4 - audio software version
0
13
62
DEFINE MACHINE
1 - number of inputs
2 - number of outputs
3 - number of setups
1 - for video
2 - for audio
14
NOTES on the above table:
NOTE 1
- When the master switcher is reset, (e.g. when it is turned on), the reset code is sent to the PC. If this code is sent to
the switchers, it will reset according to the present power-down settings.
NOTE 2
- These are bi-directional definitions. That is, if the switcher receives the code, it will perform the instruction; and if
the instruction is performed (due to a keystroke operation on the front panel), then these codes are sent. For example, if the
HEX code
01
85
88
83
was sent from the PC, then the switcher (machine 3) will switch input 5 to output 8. If the user switched input 1 to output 7
via the front panel keypad, then the switcher will send:
41
81
87
83
to the PC.
When the PC sends one of the commands in this group to the switcher, then, if the instruction is valid, the switcher replies by
sending to the PC the same four bytes that it was sent (except for the first byte, where the DESTINATION bit is set high).
NOTE 3
- SETUP # 0 is the present setting. SETUP # 1 to SETUP # 15 are the settings saved in the switcher's memory, (i.e.
those used for Store and Recall).
