User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 74
Please see Table 19, Low Priority Alert Processing on page 77. Also, Figure 7, LPA
Processing in TRANSMIT, on page 65 has a detailed flow chart on how Low Priority
Alerts are processed in the TRANSMIT state.
Server Application-side Considerations
Upon the receipt of any alert message with a status of either “1=Activated” or “2=Sent”,
the server application should automatically send an immediate SET_ALERT_STATE
message acknowledging (not clearing) the alert. The TrimTrac will continue transmitting
the alert message until it receives this acknowledgement from the application server.
After acknowledging the alert message, the server application should set about notifying
the service center operator or end-user that the TrimTrac 1.5 has reported an alert
condition. If and only if it can then be subsequently confirmed that the condition that
initiated the alert has been returned to normal should the server application send a
SET_ALERT_STATE message clearing the alert status back to normal. If the clearing
SET_ALERT_STATE message is sent before the conditions have been physically reset
to normal, the TrimTrac 1.5 will initiate a new alert message immediately after the
clearing message is received.
Under no circumstances should the server application automatically send a clearing
SET_ALERT_STATE message immediately upon receipt of an alert message without
end-user or service center operator intervention. If a SET_ALERT_STATE that clears an
alert before the monitored device or condition has been returned to its normal condition,
the TrimTrac 1.5 will not respond to the SET_ALERT_STATE message and new
activated alert messages will be sent.