User Manual

5500-62017.A.00
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4.4.1 Operating System
The Microsoft® Windows CE operating system will be used with using version 5.0 or later.
4.4.1.1 Boot loader
Fast boot shall be less than 30 seconds
4.5 POWER SUPPLY MODULE
The DCU2 power supply module shall be designed to operate between 9 Vdc to 36 Vdc and shall
include reverse polarity and over-voltage safety protection. Over voltage safety protection must
withstand up to 120 Vdc without causing damage to the DCU2’s internal circuitry. The power supply
module shall regulate the bus-supplied voltage to eliminate power spikes and noise. The provisions
taken shall eliminate electronic interference caused by fluorescent light power units, bus alternators,
air conditioning units, radio communication units, and other sources that may be found in a bus-
operating environment.
The power supply shall include a power hold-up time circuit to maintain operating power for at least
500 milliseconds when the DCU input voltage drops below 9 volts or rises above 36 volts. When the
input dc voltage drops below 9 volts or rises above 36 volts, the keyboard PCB provides a warning
interrupt signal to the SBC to conduct the orderly shutdown of the application.
The DCU2 does not have to be fully functional when the supply voltage is less than 9V, or more than
36V. When the input voltage is detected to be outside of this operating range, the DCU2 will conduct
an orderly shutdown and remain in this shutdown condition while the voltage remains outside of the
operating range. However, it is necessary for the DCU2 to automatically return to service when the
voltage returns to within the operating range. For example, frequently the bus supply voltage will dip
to a level between 9V and 5V for long periods overnight but will not necessarily drop to SBC reset
voltage before rising again to the normal operating range. When this occurs, the DCU2 must sustain
the voltage drop, and be able to restart automatically in the normal fashion after the input voltage has
been restored to 9V or above.
4.6 INTERNAL OEM MODULES
The DCU2 shall be designed to accommodate the following OEM GPS module and the WLAN
802.11b/g adapter.
Internal OEM modules must support the following power modes: On, Idle, Suspend, and Off.
4.6.1 Option for future projects where backwards compatibility is not an issue. i.e. version
DCU2 2b
• Sub D connectors replaced by quick connect 10 way connectors (e.g. RJ45 pins or Molex).