Kramer Electronics VP-23RC user manual Instruction Codes, Reset Machine Switch Groups

Communication Protocol

Table 19: Instruction Codes￿

	INSTRUCTION		DEFINITION FOR SPECIFIC INSTRUCTION			NOTE
#	DESCRIPTION		INPUT		OUTPUT
0	RESET MACHINE	0		0		1
1	SWITCH GROUPS	1-4 Set equal to video and audio		1-3 Set equal to group to		2
		inputs to be switched for the		which output is to be
		relative group		switched
2	SWITCH AUDIO OUTPUTS	1-5* Set equal to audio output to		1		2
		be switched to Master Audio out
5	REQUEST GROUP STATUS	0		1-3 Set equal to the group of		3
				which status is required
6	REQUEST STATUS OF	0		1		3
	MASTER AUDIO OUTPUT
8	BREAKAWAY SETTING	0		0	– Audio-follow-video	2
				1	– Audio breakaway
11	REQUEST BREAKAWAY	0		0		3
	SETTING
16	ERROR	Don’t care		0	– Invalid instruction	4
				1	– Out of range
18	RESET MACHINE	0		0		1
22	SET AUDIO GAIN OF AUDIO	1-5*		Gain value		7
	OUTPUT
24	INCREASE/DECREASE AUDIO	1-5*		0	– Increase gain	8
	GAIN			1	– Decrease gain
25	REQUEST GAIN	1-5*		0	– Video gain	3, 9
				1	– Audio gain
30	LOCK FRONT PANEL	0	– Panel unlocked	0
		1	– Panel locked
31	REQUEST WHETHER PANEL	0		0		3
	IS LOCKED
44	MEDIA CONTROL	Set equal to switch number		Switch data
45	REQUEST MEDIA CONTROL	Set equal to switch number		0
	SETTINGS
57	SET AUTO SAVE	1	– Autosave	Don’t care		5
		2	– No save
61	IDENTIFY MACHINE	1 or 2 – Machine name		0	– request first 4 digits	6
		3 or 4 – Program version		1	– request first suffix
				10 – request first prefix
62	DEFINE MACHINE	1	– Number of inputs	1	– For video	3
		2	– Number of outputs	2	– For audio

*1 – for CV group, 2 – for SV group, 3 – for VGA group, 4 – for microphone, 5 – for master audio out NOTES on to Table 19:

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:

0000 0001	Instruction “ Switch Groups”
1000 0010	Input #2
1000 1001	in composite video group
1000 0001	Machine #1 (master)

Was sent from the PC, then the switcher (machine #1) will switch input 2 in composite video group to its output. If the user switched input 4 in the VGA group via the front panel keypad, then the switcher will send:

0100 0001

1000 0100

1000 0011

1000 0001 to the PC.

When the PC sends instruction #1 or #2 to the switcher, then, if the instruction is valid, the switcher replies by sending the same four bytes to the PC that were sent (except for the first byte, where the DESTINATION bit is set high).

50 KRAMER: SIMPLE CREATIVE TECHNOLOGY