Specifications

Glossary CARROLL TOUCH
GL-2 Touch System Programmer’s Guide
controller The interface between the touch system and the computer. The
controller may be software-based or hardware-based, or may use
the computer’s serial (RS-232) port. See hardware-based
controller, serial (RS-232) controller, and software-based
controller.
coordinate origin corner The 0, 0 origin of the video coordinate system. This is usually in
the upper left corner of the display.
coordinate reporting One of two methods that determines the form used to send data
from the touch system to the host. The touch system reports x, y
coordinate values that identify the touch location. The x and y
values are reported as logical coordinates. See also scan
reporting.
coordinates The two-dimensional mathematical representation of a point. For
example, 29, 38 represents a value of 29 on the x-axis and a value
of 38 on the y-axis.
data bits The number of bits used to represent a character or byte of data,
usually 8. This is a communication parameter used by the serial
(RS-232) controller.
EEPROM An electrically erasable programmable read-only memory
(EEPROM) chip.
Enter Point Mode A touch reporting type under the SFP that reports only the
coordinates at which a stylus enters the touch screen. Add Exit
Point reporting can be added as a modifier.
Exit Point Mode A touch reporting type under the SFP that reports only the
coordinates at which the stylus exits the touch screen. Add Exit
Point reporting can be added as a modifier; if you do this,
however, the touch system reports the coordinates at which the
stylus exits the screen twice, first as a normal Coordinate Report
and then as an Add Exit Point Coordinate Report.
frame size A general term for either logical or physical frame size. See
logical frame size, physical frame size.
guided acoustic wave
touch technology
A technology used in touch screens, based upon transmitting
acoustic waves through a glass overlay placed over the display
surface.
hardware-based controller
(HBC)
A touch-system-independent, digital controller containing a
microprocessor. The HBC is a half-card installed in the computer,
drawing its power through the PC bus and communicating
through the bus using an I/O address and hardware interrupt.