Kramer Electronics VA-8xl user manual Kramer Protocol, 1st Byte

10 Kramer Protocol 2000

The VA-8xlis compatible with Kramer’s Protocol 2000 (version 0.50). This RS-232 / RS-485 communication protocol uses four bytes of information as defined below:

1st BYTE:	Bit 7 (MSB)	Defined as 0.
	Bit 6	0	- for sending information to the switchers (from the PC)
		1	- for sending to the PC (from the switcher).
	Bits 5…0	INSTRUCTION

The function that the switcher is to perform is defined in the INSTRUCTION table below. Similarly, if a function is performed via the machine’s front panel, then these bits are set according to the INSTRUCTION NO. that was performed.

2nd BYTE:	Bit 7 (MSB)	Defined as 1.
	Bits 4…0	Channel number
	Bit 5	Left (set to 1 when referring to the left channel)
	Bit 6	Right (set to 1 when referring to the right channel)
	Note: To mute with regular attenuation use Bit 5 and 6 = 1
	To mute immediately use Bit 5 and 6 = 0, however there may be a pop
	or click on the output of the muted channel.
3rd BYTE:	Bit 7 (MSB)	Defined as 1.
	Bits 6…0	7 least significant bits of data
4th BYTE:	Bit 7 (MSB)	Defined as 1.
	Bit 5	MSB of data (7 LSBs are in 3rd byte).
	Bits 4…0	MACHINE NUMBER.

For RS-232, a null-modem connection between the machine and controller is used. For both RS-232/RS-485 interfaces the default data rate is 9600 baud, with no parity, 8 data bits and 1 stop bit.

All the values in the table are decimal, unless otherwise stated

INSTRUCTION

#			DESCRIPTION		3rd BYTE
22dec			SET AUDIO GAIN		Set 7 LSBs of gain value
(16hex)					Gain (dB) = 31.5 – (0.5x(255-DATA))
24dec			INCREASE / DECREASE		0 - increase gain
(18hex)			AUDIO GAIN		1 - decrease gain
25dec			REQUEST AUDIO GAIN		As in Instruction 22dec above.
(19hex)					When requesting both channels, the reply is:
					 For equal left and right gain: bits 5 = bit 6
					 For unequal left and right gain: bits 6 = 0; bit 5 = 1 for reply for left
					channel
		In addition to the above, instructions 15, 18, 19, 20, 61, 62 (decimal) of Kramer’s Protocol 2000 are also fully
		implemented in the unit. For instructions 18 and 19, setups 01 to 15 (decimal) are valid.
		See the following examples:
EXAMPLES
COMMAND				EXAMPLES (MACHINE # 1)
16h	E7h 90h 81h			Set channel 7 both left and right gain -88dB
16h	AAh FFh 81h			Set channel 10 left gain -32.5dB
16h	CAh COh A1h			Set channel 10 right gain 0dB
16h	FOh DOh A1h			Set channel 16 both left and right gain +8dB
18h	EFh 80h 81h			Increment (increase) gain on 0.5dB on left and right of channel 15
19h	CFh 80h 81h			Request gain of channel 15 right. If the gain is 0dB for both left and right channels, then the
				reply would be: 59h EFh COh A1h
19h	EEh 80h 81h			Request gain of channel 14 both left and right. If the gain is different for the left and right
				channels, then, for +3dB gain in the left channel the reply would be: 59h AEh C6h A1h

26 VA-8xl - Kramer Protocol 2000