Crystal Vision
General Purpose Interface
4 General Purpose Interface
Introduction
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.
ADP 310 has four GPI inputs and two GPI outputs.
Each General Purpose Interface (GPI) inpu
t is fitted with a 6800Ω resistor connected
to the in5V and in the following table, this equates to logic ‘H’, so with no
connections to the GPI lines, preset 1 (logic ‘HHHH’) will be selected.
Each General Purpose Interface (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.
The GPI inputs can be programmed to automatically recall a previously saved preset
configuration. The 16 user preset configurations are selected using binary notation.
The two outputs can be programmed to assert themselves for a number of different
alarm conditions.
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’
Alarms
(See alarm table)
Alarm condition
No alarm
6
‘f’
Alarms
(See alarm table)
Alarm condition
No alarm
Table showing the six GPI functions
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
Binary coding of GPI inputs to recall preset configurations
ADP 310 User Manual R1.2
13
19 June 2019
