User's Manual

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545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

Reset Event

A reset event occurs only once when the MCC-545C powered up or reset,

when the event monitor task is started for the first time, or is stopped -

then restarted. It is a well-defined event that does not need to scan

anything in order to determine whether or not a reset has occurred. It

occurs once on each power up or monitor-start. There is also no

corresponding end to this event. The logical end of this event would be

power failure or shutdown, but either such event makes the MCC-545C

unable to respond to anything. An action taken on a reset event command

will remain as defined in the command until the MCC-545C is reset again or

powered off, or until some other event changes the action. Stopping the

event monitor will not clear the reset event definitions.

Command Event

An immediate action can be triggered by entering a local event command

from any port, or by remote command sent over the RF link. This type of

action does not get stored in the event table and will not be re-issued on

power-up or restart. In this way, the operator has the ability to manually

override or control conditions in the field. The event state is considered to

be “true” as soon as the command is entered or received. Once the action

is completed, the event state is set to “false” again.

Scanned Event

Scanned events are tested on a periodic basis by the monitor task. An input

signal that would trigger a scanned event must be repeatedly tested to see

if the signal persists at a trigger level before an event is started. A scanned

event is started when a signal remains at (or above or below) the trigger

level for a defined settling duration. When an event is detected by its input

condition persisting at its high state for a settling duration, that event's

associated action is triggered and the monitor task begins looking for the

end of the event. The end of an event occurs when the event remains at a

low state for a defined hold-off duration. After the hold-off duration with

the input condition at its low state, the event is enabled to scan for the

next event.

For example, if an event is testing the battery voltage to be above 5.0

volts, the action will be triggered when the voltage is first detected to be

at or above 5.0 volts for the entire settling period. When the voltage goes

below 5.0 volts for the hold-off period, it will re-arm the event to trigger

the next time the voltage goes to or above 5.0 volts. The event action is