User`s guide

CARROLL TOUCH Glossary
Touch System Diagnostics (CTDIAG) User’s Guide GL-5
software-based controller
(SBC)
A touch-system-independent, digital controller that has no
microprocessor, but, instead, shares processor time with the host
microprocessor. The SBC 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.
stop bit The number of bits, usually 1, inserted by the serial (RS-232)
controller into the data stream to inform the host computer that
the transmission of a byte of data is complete. This is a
communication parameter used by the RS-232 controller.
sync error An error that occurs when the beam number provided by the SBC
hardware at the time of an SBC hardware interrupt is not one
beam greater than the beam number provided by the previous
SBC hardware interrupt.
TAPI See Touch Application Program Interface (TAPI).
TAPI driver A software program that interfaces with the touch system
controller and with TAPI.
TAPI interrupt The software interrupt used to communicate with the TAPI
driver.
touch active area The area inside the touch frame or touch screen that is sensitive to
touch.
Touch Application
Program Interface (TAPI)
A Carroll Touch proprietary series of software function calls
within the individual controller driver that interfaces a touch
application to a touch system using the Smart-Frame Protocol.
TAPI enables a properly-written application to interface with any
Carroll Touch controller driver that communicates serially or
through the PC bus and that recognizes the Smart-Frame
Protocol.
touch frame A rectangular assembly of circuit boards. Two adjacent circuit
boards contain banks of infrared light-emitting diodes (LEDs),
while the opposite two contain banks of complementary
phototransistor-receivers. The LEDs and phototransistors create a
grid of invisible infrared light. The opto-electronics are concealed
behind an IR transparent bezel, which shields the opto-electronics
from the operating environment, while allowing the IR beams to
pass through.