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2-44 IntelliTouch/SecureTouch Guide
Power
Various methods can be used to obtain power for the internal USB controller.
This section addresses the two most common methods:
• Parasitic tap of 5Vdc
• Parasitic tap of 7-30Vdc using a DC to DC converter.
Parasitic Tap of 5Vdc
It may be possible to find and use a 5Vdc power source directly from the
monitor’s circuitry. Before attempting this you should consult the monitor’s
service manual, or the monitor’s manufacture.
Follow these steps to obtain 5Vdc directly from the monitor:
1 Find a suitable 5Vdc power source on the circuitry of the display. Insure that
the source can sustain the additional load requirements placed on it by the
controller. An acceptable source should be able to supply an addition 100ma
with out effecting other systems in the monitor.
2 Solder or splice the non-terminated end of the controller power cable
(part number: 889507-000) to the tap location. Be sure to observe the correct
polarity. The controller power cable (part number: 889507-000) uses the red
conductor for the (+) signal, the black conductor for the (-) signal, and the
green conductor for frame ground.
3 Attach the terminated end of the controller power cable
(part number: 889507-000) to connector P4 of the IntelliTouch USB
controller, and secure with a small amount of glue.
4 Take up the excess cable with zip ties and secure.