User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

The NET “low” input indicates the RF modem is offline to a Base or

Repeater.

Analog Event

An analog event is determined by whether or not an analog input signal

remains above or below a threshold for the given settling duration.

“Above” or “below” and the threshold level are also given in the event

definition. The end of an analog event occurs when the signal has

persistently returned to the non-event side of the threshold for the hold-off

duration.

5.6.3 Action Definition

An “action” can be assigned to each event defined in the event table.

When the event condition is detected, the action is initiated. Available

actions are defined in the following sections. Multiple actions are

supported by defining multiple events that test the same input, but take

different action, or multiple actions can be defined using a special

“continue” event. The “continue” event does not test the input condition

again, but will trigger the action when the event it is connected to detects

the event.

Any action can be forced on a timed basis by several methods. One method

is to use the MCC-545C scheduler (SCHED command) to trigger the desired

immediate action. For example, the UPDT action can be specified by the

insertion of the EVENT,UPDT, group-number command into the MCC-545C

scheduler to produce reports on a timed basis. See the SCHED command for

this capability. Another example would be to pulse an output line by

placing two commands in the scheduled event list that would first SET then

CLR the signal. The duration of the pulse would be controlled by the offset

value in the SCHED command. Yet another method is to use an event timer

(counter) to facilitate scheduling of actions. Special timer registers are

provided for this purpose, and will automatically count down from a non-

zero value to zero at a rate of 1/16 seconds per count. An event command

can monitor the timer register, and when it reaches zero, the action can be

taken, and the timer reset to the next desired time count.