Crystal Vision
Hardware installation
AVDELAY 3G User Manual R1.11
9
09/08/2016
2.3 General Purpose Interface (GPI)
Each frame slot has up to six connections ‘a-f’ for GPI control and monitoring. These
connections are available at the rear of the frame on the 26-way D-Type remote connectors.
GPI
Low (<1V)
High (+5V)
1
‘a’
Recall preset bit 1
See following table for user preset control
2
‘b’
Recall preset bit 2
3
‘c’
Recall preset bit 4
4
‘d’
Recall preset bit 8
5
‘e’
6
‘f’
Alarms (
See alarm table)
Alarm condition
No alarm
As supplied, each GPI output has a 270Ω resistor in series with its output. This allows for an
external LED to be driven, connected to a DC voltage of +5V.
Each General Purpose Input (GPI) is fitted with a 6800Ω resistor connected to
the internal
+5V.
The 16 user preset configurations can be recalled using binary notation.
GPI
Bit 8
Bit 4
Bit 2
Bit 1
GPI
Bit 8
Bit 4
Bit 2
Bit 1
Preset
Preset
1
H
H
H
H
9
L
H
H
H
2
H
H
H
L
10
L
H
H
L
3
H
H
L
H
11
L
H
L
H
4
H
H
L
L
12
L
H
L
L
5
H
L
H
H
13
L
L
H
H
6
H
L
H
L
14
L
L
H
L
7
H
L
L
H
15
L
L
L
H
8
H
L
L
L
16
L
L
L
L
GPI out 6 (f) can be configured to be asserted for a selection of error conditions.
