Specifications

7700/7800 MultiFrame Manual
7700ACO2-HD Dual HD/SD-SDI Smart Automatic Changeover
Page - 6 Revision 1.0
GND
To Internal
Circuit
2 k
Ω
GPI
+ 5 Volts
Figure 2-3: GPI Input Circuitry
GPO 1 tallies on the ACO1 path and GPIO 2 tallies on the ACO2 path. The GPO will follow the respective
video output. If Video 1 is routed to the output, the GPO will be LOW, and if Video 2 is routed to the
output, the GPO will be HIGH. The GPO is active low with internal pull up (10k Ohm) resistors to +5V.
When the output goes low it is able to sink up to 10mA. When high, the signal will go high (+5V). Do not
draw more than 100
µA from the output. Figure 2-4 shows the circuit for the general purpose output.
From Internal
Circuit
10k Ω
+ 5 Volts
GND
GPO
10
Ω
Figure 2-4: GPI Output Circuitry