EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 63
5.3 Internal Logging of Fault Conditions
5.3.1 EPD Status Faults Record
The EPD logs data to an internal data record in EEPROM, to indicate that faults have
occurred. These faults are as follows:
1. Event Logged. An event (dose alarm or a fault) has been logged
in the EPD’s event history store.
2. Communication Error. Communication with the EPD failed, typically the
unit was removed from the IR media prematurely.
3. Cal Factors Bad. The EPD calibration factors failed a CRC check
and cannot be recovered from secure store.
4. EEPROM Fail. An un-recoverable EPD secure store failure
occurred.
5. Bad Sectors. The number of bad EPD secure store sectors.
There is a maximum of nine spare sectors.
6. Detector Test Fail. The EPD detector test was run and the number of
counts received were less than required to pass
the test.
7. Detector Threshold Fail. The EPD detector thresholds failed to load
successfully
8. Radio Fail. Reserved for future use.
9. Other Fault. A fault occurred causing the EPD to reset.
10. Disabled. The EPD is ‘Off’ ( not calculating dose).
This data may be read and cleared via the IR communications link & EasyEPD2.
5.3.2 Event History store
The EPD logs up to 23 events in a non-volatile store, together with a time stamp. The
Event History store is accessible when the EPD is interrogated over the IR
communications link (e.g. by EasyEPD2). Alarm and fault events are recorded, see
Tables 4.1 and 5.2.
The store comprises a circular ‘buffer’, the latest event over-writing the oldest.
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