User`s guide

CARROLL TOUCH Glossary
Touch System Diagnostics (CTDIAG) User’s Guide GL-3
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.
hardware interrupt A dedicated hardware line between the touch system and the
computer, defining where to search for an SBC or HBC.
HBC See hardware-based controller (HBC).
HBC driver A software program that interfaces with the hardware-based
controller via a selectable I/O address and optional hardware
interrupt and with the application via the touch application
program interface (TAPI).
host (host system) The computer system to which a touch system is added.
I/O address A parameter that defines the hardware base address location of an
SBC’s or HBC’s hardware registers on the controller card.
infrared touch technology A technology used in touch systems, based upon superimposing a
grid of invisible infrared beams in front of the display surface.
interrupt number A parameter that defines where to search for an SBC or HBC
controller.
logical (virtual) beam A member of a set of beams that includes both the physical beams
and the interpolated virtual beams, which are imaginary beams
that occupy the spaces between physical beams. In each axis, the
number of logical beams is twice the number of physical beams
minus one.
logical coordinates A coordinate system consisting of an x- and y-axis, each made up
of logical beams. The origin of the coordinate system is the upper
left corner of the display/touch frame.
logical frame size The logical frame size is double the physical frame size minus
one, since the space between the opto-pair is considered a virtual
beam. See beam, physical frame size.
MDI See modular digital interface (MDI).
modular digital interface
(MDI)
The touch-system-to-controller interface created by confining all
of the analog functions to the touch system. The MDI makes a
standard touch system controller-independent and reduces the
touch system cabling requirement to a simple 8-pin standard
phone cable up to six feet in length. This extends the allowable
distance between the touch system and controller and improves
noise immunity.
option A selection, test, or function available on a menu.