Calibrating a NextWindow USB Touch Screen

The following procedure applies to all of NextWindow's USB touch screens.

(Note: Touch screens with serial communications require a different calibration procedure. Refer to the manual that comes with the product.)

Calibration Procedure

With a clear desktop on the computer: Press [Scroll Lock] on the computer keyboard six times,   Or Gently push a ballpoint pen into the hole next to the LED in the back of the unit until the touch screen beeps (not available on all models).

	(When in calibration mode, the LED on the back of the unit glows red.)
	The mouse pointer automatically moves to a position at the top left of the screen.
	Touch and hold your finger on the screen at that position until you hear a long beep.
	The pointer moves to three further positions in sequence. Touch each point in turn—top right, bottom right and bottom left—until you hear the beep for each. This completes the USB calibration procedure.

Test the calibration by moving the mouse pointer (cursor) around the screen checking that it closely follows your finger. If the calibration is not satisfactory, you can re-calibrate.

Calibration Notes

	When removing your finger, lift it straight off the screen, making sure you don’t drag it across the screen.
	You can exit calibration mode by pressing the calibrate button again or by pressing the [Scroll Lock] key twice.
	The default calibration key on a Microsoft Windows keyboard is [Scroll Lock]. This can be changed to a different key if required using NextWindow's USB Config program, which you can download from the NextWindow Software page.
	You cannot use a keyboard key to initiate calibration on a Linux or MacOS touch screen application because these operating systems do not support USB keyboard synchronisation. For those systems, use the hardware calibration button on the touch screen.