EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 68
An EPD will only raise this condition if it is first triggered by the system software, in
effect a message is passed to the EPD saying: “raise an alarm if the following write
operations don’t complete successfully within ‘N’ seconds.” If the condition does
occur then it is necessary to train the users not to remove the EPD from the IR field
until indicated ( i.e. by the system, through displays, Leds etc. ). However the EPD
communications software is tolerant of short duration loss of connection.
If the condition does occur it is normal for system software to clear the alarm and
LCD display automatically when the EPD is re-presented to the IR media. The
system software then checks the status of the EPD, completes any necessary data
write operations, advises the user what to do, and clears the alarm. The display then
returns to normal.
If the condition arises regularly then this may indicate a problem in the design of the
system software, i.e. the user interface.
If the user or system fails to clear the alarm in the way described above, then the
condition can easily be cleared using EasyEPD2.
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