7800 Multiframe Manual
7825DSK2-LG(-HD)(-3G) 3G/HD/SD Dual Downstream Keyer
Page 2-10
Revision 2.0
INSTALLATION
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 5.11.5). See section 4.12 of the Preset Control Window for VLPRO Configuration
Settings.