Crystal Vision Demon 2, Руководство пользователя

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Crystal Vision
Hardware installation
Demon 2 User Manual R1.4
13
07/09/2012
Audio 2 & 3 I/O 26 way Hi-Density D-Type Connector
1
GND
8
Ch4+
15
Sync
22
2
Ch1+
9
GND
16
AES1-
23
3
Ch1-
10
AES2+
17
AES1+
24
4
Ch2+
11
N.C.
18
CH4-
25
5
Ch2-
12
AES2-
19 26
6
Ch3+
13
AES2+
20
7
Ch3-
14
AES1+
21
2.3 General Purpose Interface (GPI)
With GPI control enabled, remote switches can be used to recall any of the 16 stored
preset configurations. The GPI lines are pulled up on-board to +5V via a 6k8Ohm resistor
and can be used with closed-contact switches or +5V to +24V logic levels.
Each slot has an associated set of GPI connections for remote control and external status
outputs on the frame rear-panel remote connectors. For convenience, GPI lines are
associated with reference codes ‘a’ to ‘f’ in the connector pin-out tables for each frame.
The following table shows how the four GPI lines 'a' to 'd' are used as a four-bit binary
code to select up to sixteen Demon 2 presets.
GPI Functions Op=open, Cl=closed (connect to ground)
Preset
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
‘a’
Op Cl Op Cl Op Cl Op Cl Op Cl Op Cl Op Cl Op Cl
‘b’
Op Op Cl Cl Op Op Cl Cl Op Op Cl Cl Op Op Cl Cl
‘c’
Op Op Op Op Cl Cl Cl Cl Op Op Op Op Cl Cl Cl Cl
'd'
Op Op Op Op Op Op Op Op Cl Cl Cl Cl Cl Cl Cl Cl
Demon 2 presets are numbered from 1 to 16. So to recall the fifth preset the GPI lines
need to assert a decimal value of 4. This only requires GPI line 'c' to be grounded with an
external switch closure. So to recall the sixth preset, the decimal value five must be
asserted. This will require both GPI lines 'a' and 'c' to be grounded at the same time. To
recall preset 1, all four GPI lines should be open, for last preset (labelled 16) all GPI lines
should be grounded.
The reason binary coding is used, is that it only requires four GPI lines to recall up to
sixteen presets instead of sixteen separate lines.