How Capacitive Technology Works
Touch Processing
Touch location is registered by 4 current measurements that are proportional to touch location's
distance from sensor's four corners. |
The touch controller measures changes in current at the sensor's 4 corners and using a
proprietary signal processing technique calculates and outputs the X and Y coordinates in digital format
to host system via serial RS232C communication |
The host system receives the serial data from the controller and using an ISI provided driver or custom
written API's registers an event in the application software. |
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Required Equipment |
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The capacitive touch sensor is comprised of a single piece glass substrate with conductive and and protective coatings, proprietary electrode system and cable for connection to the touch controller. The sensor is available in a variety of sizes both flat and curved and mounts inside a flat panel or CRT display The electrode system and conductive coating uniformly distribute the voltages received from controller over sensor surface. |
The touch controller may be installed either inside the display, or mounted on the outside of the display, or installed
in a PC expansion slot. |
The host system using an available RS232C serial port or ISA PC bus expansion slot. |