Annunciator Sequences and Options
K-4 Verbatim Owner's Manual
A variant of the R-1-8 sequence is obtained by executing code 981 1.
Channel states transit from normal to alarm when criteria violations persist for
the trip delay. The alarm state is then locked in until acknowledgment is made.
If no phone numbers are configured, then this transition happens automatically
and immediately (R-1-5-6). Otherwise, operator action is required.
The transition from acknowledged alarm to unacknowledged RTN is made
whenever the criteria violation goes away for the trip delay period. The RTN
state is then locked in until acknowledged. RTN acknowledgment is made in the
same fashion as alarm acknowledgments. The channel states are reset either
manually or by expiration of the reset timer. The reset timer begins running
when the original alarm condition is acknowledged. This means that if a
sufficiently long interval exists between acknowledgment of the alarm and the
RTN, then the reset will happen immediately.
The main differences between this variant and the standard R-1-8 sequence are
as follows. First, there is no registration of momentary alarms once the RTN
state is entered. Once the RTN state is acknowledged, no further calls will be
triggered until the channel is reset. This is to say transitions in the channel state
may continue, but will not be reflected in the annunciator state. Still, all reports
will reflect the current state of the channels. Second, there is no visual
indication for the RTN states. The LEDs will continue to reflect the
acknowledged alarm status. Third, the silence pushbutton stops all flashing
LED indications. Fourth, there is the automatic reset timer.
Unlike the implementation for the A designations, RTN conditions are checked
continuously for all channels. So long as any unacknowledged alarm or RTN
condition exists, the Verbatim will be making calls. Alarm conditions have
priority. Hence, if an alarm is one call group and an RTN is in another, no calls
will be placed to the RTN group until the alarm is acknowledged.
If the trigger for a call is an RTN, then the report will explicitly mention this
before reporting the status of all channels in the group. An RTN report
mentions RTN conditions only. Any acknowledgment while in RTN calling
state acknowledges RTN conditions only. In contrast, any operator
acknowledgment during an alarm call will also acknowledge all RTNs. But,
the alarm reports do mention all unacknowledged RTN conditions.
If a new alarm occurs on any channel while in the RTN calling state, a change
from RTN to alarm calling will occur as soon as possible. This can happen no
sooner than the completion of any report in progress. Such reports may or may
not include mention of the new condition depending on whether that channel
has already been announced.
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