Introduction
5000 Mobile Terminal Product Guide (5000-REV2.21)
Chapter 1-4
monochromatic (16 gray levels). Bordering the display area, is a dedicated colored keypad overlay. See
Figure 1-1.
Color displays offer more distinctive details than that of monochrome displays; whereas, monochrome
displays are more visible in direct sunlight than the color displays are.
Capacitive type touch-screens operate based on skin contact on a surface contact layer (contact alters
the local electrical capacitance to identify a cursor location). Dirty skin or screen surface, or excessive
moisture is detrimental to the touch capability.
Resistive type touch screens operate based on surface contact pressure (two separated transparent
conductive layers are pressed together at the contact point to identify a cursor location). These screens
can be operated via skin contact, or with gloved fingers or pointed objects. Operation of resistive
screens are tolerant of some surface grime.
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The touch screen should not be touched for at least five seconds after the display
becomes visible after powering up, in order to allow the screen hardware to initialize
properly.
The touch screen should be kept clean (use a
mild
cleaning agent) and away from corrosive materials,
to ensure viewing clarity and dependable operation. The touch screen assembly does have a gasket
sealing the enclosure to prevent any moisture from entering and affecting any circuitry.
Enclosure
The MT unit is packaged in a dust and water-resistant enclosure with a poly-enamel finish. See Figure
1-1 for a front view of the enclosure.
The MT unit operates within a -10 to +40 degree Celsius temperature range and within a 5 to 95 %
relative humidity range.
The MT unit can be mounted directly to a frame, which is in turn connected via two horizontal pivot
pins to a cradle that is attached to the mobile vehicle. This assembly would provide tilt adjustment for
optimizing the viewing angle of the MT display screen. The assembly must be capable of supporting
the weight of the MT unit during shocks and vibrations incurred by the mobile vehicle.
The enclosure occupies a space 12.4 inches wide, 10.1 inches high, and 3.4 inches deep.
The following figure shows a MT unit attached to a pivot-type mount assembly.
