Crystal Vision
General Purpose Interface
4 General Purpose Interface
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 3 and GPI 4 can be set to be both inputs and outputs. When set to
be inputs they allow the full selection of 16 user selectable presets. When GPI 3 and
GPI 4 are set to be outputs the number of alarm output is increased to four. GPI 3
and GPI 4 are assigned from the board edge or remote device such as an active front
panel, VisionWeb PC control and SNMP.
GPI inputs
Low (<1V)
High (+5V)
1
‘a’
Recall preset bit 1
2
‘b’
Recall preset bit 2
See following table for user preset control
3
‘c’
Recall preset bit 4
4
‘d’
Recall preset bit 8
GPI outputs
3
‘c’
Input missing/incompatible,
Video frozen/Black, Audio
silence/missing/Aspect ratio
Selected alarms asserted
(after set delay if appropriate)
No alarm
4
‘d’
Input missing/incompatible,
Video frozen/Black, Audio
silence/missing/Aspect ratio
Selected alarms asserted
(after set delay if appropriate)
No alarm
5
‘e’
Input missing/incompatible,
Video frozen/Black, Audio
silence/missing/Aspect ratio
Selected alarms asserted
(after set delay if appropriate)
No alarm
6
‘f’
Input missing/incompatible,
Video frozen/Black, Audio
silence/missing/Aspect ratio
Selected alarms asserted
(after set delay if appropriate)
No alarm
Note:
Input missing, input incompatible and aspect ratio will assert the select alarm immediately
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
in5V.
Q-Down-AG 3G/ATG 3G User Manual R2.1
11
11 July 2019
