FAQ's ~ Frequently Asked Questions:
Q. What is Resistive Touch technology?
A. Resistive touch technology consists of a glass or like panel that is coated with electrically conductive and resistive layers. The thin layers are separated by invisible separator dots. While turned on, an electrical current moves through the screen casting a sort of net across the monitor face. When you touch the screen (creating pressure) the layers are pressed together, causing a change in the electrical current and a touch command to be registered. Reliability is impressive because resistive touch screens do not have to be recalibrated when environmental conditions change. Resistive-type touch screens are usually the most practical. Resistive screens are extremely durable and can withstand the harshest of environments. Resistive technology is the work horse of touch technologies.
This type of screen is recommended for point of sale systems-kiosks (POS), restaurant registers, control or automation systems, medical use, hospitality kiosks, grocery/convenience, standard kiosks and others.
Q. What is Capacitive Touch technology?
A. A Capacitive Touch screen consists of a glass panel with a capacitive (charge storing) material coating its surface. Circuits located at corners of the screen measure the capacitance of a person touching the overlay. Frequency changes are measured to determine the X and Y coordinates of the touch command.
Capacitive type touch screens are very durable and have high clarity. They are used in a wide range of applications, from restaurant and point of sale (POS) use, to industrial controls and information kiosks.
Q. How do I interface my program to the touch screen?
A. While there is a programming API available, the easiest is just to use the touch screen's mouse emulation, if your program uses a mouse, it already works with touch!
Q. How do I attach the touch screen to the LCD?
A. You can use thin double sided tape to attach the touch glass to the frame of the LCD or to your enclosure's bezel and mount the LCD flush from the rear of your enclosure.
Q. How does the touch screen controller work?
A. It takes x & y values from where the user touches the touch screen and converts them to mouse coordinates transmitting them to your PC's RS-232 port.
The touchscreen glass can be attached to the front of the LCD or its enclosures bezel. The controller plugs directly into a nine pin DB-9 serial port (or USB for some models). EarthTouch drivers are easy to install and use. Mouse emulation drivers for DOS and Windows are included. Sample ‘C’ source code is available for embedded applications.
Touch Kits include:
1) Touch screen
2) EarthTouch RS-232 (or USB) Touch Controller
3) Power Supply
4) Touch Drivers for Windows.
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Side by side touch screen technology comparison.
