Instruction manual

38
General Purpose Input/Output (GPIO) Options
The MP700 may be ordered with a GPIO interface board to allow pushbuttons
to trigger actions on the media player.
GPIO PINOUT
• The eight Button INPUT pins (pin 2) have internal 4.7 K ohm pull-up resistors
to +5V. Pull the line to ground (pin 1) to trigger input. There is a 3 second
lockout after trigger to de-bounce the input.
• The LED interface has a ground and a positive VCC that is driven by a
transistor. When activated, there is 4VDC available to illuminate an LED
for the button. Normal condition is off and the 4VDC is asserted while the
button is pressed. Current draw on this port should not exceed 20 mA. Use
of a current limited LED illuminated button is recommended.
• Reaction to a particular button press can be assigned by using the TOOLS,
Button Setup option in our Quick Sign Pro 700 software.