Kramer VA-8XL, Руководство пользователя

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26 VA-8xl - Kramer Protocol 2000
10 Kramer Protocol 2000
The VA-8xl is 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
(16hex)
SET AUDIO GAIN Set 7 LSBs of gain value
Gain (dB) = 31.5 – (0.5x(255-DATA))
24dec
(18hex)
INCREASE / DECREASE
AUDIO GAIN
0 - increase gain
1 - decrease gain
25dec
(19hex)
REQUEST AUDIO GAIN As in Instruction 22dec above.
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