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Teledyne API – Model T700 Dynamic Dilution Calibrator Principles of Operation
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10.4. FRONT PANEL TOUCHSCREEN/DISPLAY INTERFACE
The most commonly used method for communicating with the T700 Dynamic Dilution
Calibrator is via the instrument’s front panel LCD touchscreen display from where users
can input data and receive information directly.
Figure 10-10: Front Panel Display Interface Block Diagram
The LCD display is controlled directly by the CPU board. The touchscreen is interfaced
to the CPU by means of a touchscreen controller that connects to the CPU via the
internal USB bus and emulates a computer mouse.
10.4.1.1. Front Panel Interface PCA
The front panel interface PCA controls the various functions of the display and
touchscreen. For driving the display it provides connection between the CPU video
controller and the LCD display module. This PCA also contains:
power supply circuitry for the LCD display module
a USB hub that is used for communications with the touchscreen controller and the
two front panel USB device ports
the circuitry for powering the display backlight
06873B DCN6388