4-2 Chapter 4: Programming
Wedge Controller Interface
Refer to the Wedge Controller 1.0 Implementation Specification
(497-0001747) and the Trigantor Device Specification (006-8601066) for a
complete description of the Wedge Controller (Wedge)
The Wedge consists of a microcontroller (8051) and associated logic
(including the Trigantor ASIC) which supports certain devices that can
be logically connected in series with a standard PC keyboard. It
controls input devices such as the ISO 3-track MSR and keyboard data,
and merges the data from any of them into the data stream of a PC
keyboard. It also controls the operation of the speaker.
Touch Screen Interface
The touch screen interfaces to the terminal via the terminal’s standard
RS232 port. The 5964 LCD uses the Serial/SMT3 controller referenced
in that document.
There is a bar code label (two-dimensional PDF417 symbology)
attached to the tail of the touch sensor that contains the 25 point
linearization parameters associated with that particular touch sensor.
This bar code label is scanned and the resulting data block is
programmed into an on board non-volatile EEPROM on the 5964 LCD
Display Main Board during the manufacturing process. This provides
the touch controller with course calibration data prior to initial system
power-up.
After the course calibration data has been stored, all that is required to
calibrate the sensor when installed on the LCD is to run the two-point
extended calibration routine. The extended calibration routine has the
two touch points moved inward 12.5% from the corners of the display
for easier access.
The MicroTouch firmware defaults to the following communication
parameters:
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