LEM DCBM 400 Series, Operation Manual

Page: 83 / 95

Page 83/95
21January2021/Version 0
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7.6. Event logbook
The DCBM features an event logbook,
tracing metrological events as well as
other events linked to the application
software.
When an event occurs, it is permanently
stored into the DCBM logbook, along
with the current status register and the
corresponding UTC timestamp.
!
Logbook entries cannot be erased.
In case the logbook reaches maximal
capacity, the DCBM is out of order (error
logbookIsFull is raised irrevocably,
preventing new transactions).
i
The DCBM can store approximately
40 000 events.
The content of the event logbook can be
retrieved using the
/logbook
API (see
§7.1). When a large number of events is
stored, retrieving the logbook can take
several minutes. The logbook cannot be
retrieved partially.
The logbook is digitally signed to ensure
its authenticity (authentication and integrity). Refer to section "7.4. Data authenticity".
i
The list of events is available in the Communication Protocols manual.
{
"meterId" : "1202531106",
"logbook" : [
{
"timestamp" : "2020-09-14T10:05:05Z",
"eventCode" : "EV_COMMISSIONING",
"status" : [
"STATUS_SENSOR_LINK",
"STATUS_TAMPERING",
"STATUS_TIME_SYNC"
]
},
{
"timestamp" : "2020-09-14T10:06:03Z",
"eventCode" : "EV_POWER_SUPPLY_FAILURE",
"status" : [
"STATUS_SENSOR_LINK",
"STATUS_TIME_SYNC"
]
},
{
"timestamp" : "2020-09-18T07:34:33Z",
"eventCode" : "EV_TIME_SYNC_SUCCEEDED",
"status" : [
"STATUS_SENSOR_LINK",
"STATUS_TIME_SYNC"
]
}
}