Product manual

Operating the Model 26
96 025-9158L
status is a higher priority status than an Alert status, the PA On status becomes the status
displayed on the station’s LED pair.
Once the PAs in all the alerted stations are on, the Model 26 enables its handset
microphone and waits for the dispatcher to key the microphone to make any
announcements. It also switches its PA READY output to a logic low (or a logic high,
dependant on its configuration) to signal a console that the PAs are available. If the
dispatcher keys the Model 26 microphone before the PAs are all ready, a short beep will
sound in the ear piece when it is time to talk. If the microphone is not keyed before the
Wait for Dispatcher Time-out expires (refer to
Wait for Dispatcher Timeout on page 46),
the Model 26 sends a “PA Off” command to all the Model 6s. This command is
addressed to all Model 6s and is broadcast 4 times (100 milliseconds between each one).
The Model 26 then polls each Model 6 to get its current status.
As long as the microphone is keyed the Model 26 will not send a “PA OFF” command.
After the microphone is unkeyed the Model 26 waits for the period of time held in the
Hold After Dispatch Time-out parameter before sending a “PA OFF” command to all
Model 6s. If the microphone is keyed again before the “PA OFF” command is sent, the
Hold After Dispatch Time-out is reset after the microphone is unkeyed.
Talk-Back Mode
This is a special mode in which voice communication with the dispatcher can be initiated
at a Model 6. If a party at a Model 6 wants to talk directly with the dispatcher, they can
take the Model 6 handset off-hook. This person keys the microphone and waits for a clear
signal before being connected directly to the dispatcher at the Model 26.
The dispatcher sees a MODEL 6 Talk status indication on the system button LED pair
associated with the station initiating the conversation. The Model 26 also generates a
beep prompt if one is programmed under the Model 6 Talk Request parameters (refer to
Model 6 Talk Request on page 51). The Model 6 Talk status is the lowest priority status
and its display on the LED pair will be overridden by any other status except clear.
This communications link is half-duplex. This means only one end of the link can talk at
a time. After the party at the Model 6 unkeys their microphone, the dispatcher has the
period set by the Hold After Dispatch Time-out parameter (refer to
Hold After Dispatch
Timeout on page
46), to reply by keying their microphone.
Note
This mode is intended only as a backup or emergency voice link
between a station and the dispatcher. It has the lowest priority
on the Model 26, and while it is in use the Model 26 is unable to
receive status changes from, or send commands to, all other
Model 6s.