Installation Manual

8
Playing Back a Page
The DFT120 can be configured to either automatically play back a recorded page announcement or to store
recorded pages until directed to begin playing back these pages by some external device. The Play control
on the I/O connector and setup switch 8 "Play Mode" control the method of playback. Selecting Automatic
allows the DFT120 to operate without external signaling. Selecting Manual requires external triggering of
page playback.
The manual type of operation is sometimes necessary when the DFT120 is not the only device feeding the
PA system. With this type of operation the unit will record and save up to 16 pages until playback is triggered,
at which time all stored pages will be played in the order in which they were received. Once played, the
messages are erased from memory. When the DFT120 has 16 messages stored or if all available memory
has been used, it will issue a busy back tone whenever it is accessed until additional message space is
made available by playing the stored pages.
Override Operation
The DFT120 includes an override input that has priority over pages made through the Page In input. The
override input is a live input and does not record the page for playback at a later time, therefore it does not
protect the override input from feedback.
When an override page is detected either through loop start or contact closure signaling, the current recorded
page being played is immediately stopped and the override signal is sent to the Audio Out connector, and
thus to the PA system. After the override page is complete, the page that was interrupted is played again
from its beginning followed by all subsequently recorded pages. During an override, the DFT120 can
continue to record pages from the Page In input, however if the maximum number of pages stored or total
memory time is exceeded, then the unit will produce a busy back tone at the page input until previously
recorded pages are played.