evertz 7700 - Figure 2-2: Keyer GPIO Opto Isolator Circuitry

7700 Multiframe Manual
7725DSK-LG / 7725DSK-LG-HD HD/SD Logo Inserter & Media Keyer
INSTALLATION Revision 1.4 Page 2-9
GP+3.3v
Vext
8
15
10
1.8 k W
GPI A
+ 3.3 Volts
5
GPI C
14
GPI B
9
GPI D
12
GPI E
7
GPI F
13
GPI G
11
GPI H
GND
Chassis
Ground
1
10k W
3
GPO 1
2
GPO 2
4
GPO 3
6
GPO 4
15
Vext
GPI Commands
To Internal
Circuit
GPO Tallies
From
Internal
Circuit
Same as above
Same as above
Figure 2-2: Keyer GPIO Opto Isolator Circuitry
All GPI inputs are level triggered. Lowering the GPI input to a potential below Vext will select the
allocated preset definition. The 8 GPIs (A through H) are dedicated as load logo controls. When one of
these GPI inputs is activated, the corresponding logo is loaded into active video. If multiple inputs are
active both commands are ignored until a single input is recognized.
The GPI to logo allocation is programmable using the GPI Setup menu item on the PRESET menu.
(See section 4.11.5). See section 3.12 of the Preset Control Window for VLPRO Configuration Settings.