Rockwell Automation Discrete Machine Performance Solution - Manual (Page 28)

D ISCRETE M ACHINE P ERFORMANCE S OLUTION U SER ’ S G UIDE
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Resistive touchscreens consist of two layers:
„ A lower layer (glass substrate) with a resistive coating and a voltage applied.
„ An upper layer (cover sheet) with a conductive coating.
Clear spacer dots separate the two layers.
When a user presses the upper layer onto the lower layer, the upper layer receives the
voltage applied to the lower layer. The touchscreen controller detects the change in
voltage on the upper layer and alternates voltage horizontally and vertically through the
layers. The voltage transferred to the upper layer is proportional to the location of the
touch on the screen.
Calibrating the touchscreen
The touchscreen supplied with the VersaView computer is factory installed and calibrated.
In the event that you need to recalibrate the touchscreen, use the following procedure:
To calibrate the touchscreen:
1. Locate the calibration utility in the Control Panel or insert the touchscreen driver
diskette in the floppy drive of the computer.
2. Using the appropriate commands for your operating system, run the calibration utility.
3. Follow the instructions in the calibration utility to complete the calibration process.
Do not use sharp instruments to activate the touchscreen. Scratching the surface of the
touchscreen can damage the unit.
Discrete.book Page 22 Wednesday, December 8, 2004 2:22 PM