Installation Manual

13
External I/O Connections and Control
Five control inputs (Record, Play, Stop, Override, and Abort) are offered to the user for complete control over
the recording and playback processes. None of these inputs are necessary when the DFT120 is operating
automatically (setup switch 8, UP), but may be required based on system requirements. All of the control
inputs are optically coupled so as to electrically isolate each activation initiated via contact closure or open
collector driver.
Abort Control Input
The Abort input is used to prevent a message from being recorded. It does not abort the playback of mes-
sages. To stop the playback of a message, see Stop Control Input. See Message Abort in the Setting Setup
Switches section.
When the Abort input is activated, the message that is being recorded will be immediately halted and the
busy back tone sent to the audio input. The recorded message will not be played as part of the playback
message sequence. This causes the user to be cut off and prevents the page from being broadcast. The
busy back tone will be output for as long as this input is held active.
Override Control Input
An Override bypass input which, when activated, stops the play sequence in order to allow a separate audio
input from Priority RJ11 connector to be routed directly through the DFT120. The play sequence, when
allowed to resume, will continue to play back a sequence from the beginning of the message it was playing
when the Override (Emergency) bypass input became active.
The activation for this input must be maintained for the amount of time that the dedicated Override audio
input is to be routed directly through the system. As soon as the activation is released, the message play
sequence will resume, after a one second delay. Normal system recording can still be performed during an
override condition.
Stop Control Input
Messages being played can be skipped using this input. A momentary contact closure will cause the mes-
sage being played to be stopped and the next message to be played. Once a message has been stopped
using this command, the message is canceled and cannot be played back at a later time.
The Stop command will have no effect on the operation of the record process. If the unit is recording at the
same time it is playing, a Stop command will only stop the currently playing message.
If the Stop control is maintained, the DFT120 will stop the currently playing message and will wait for the
Stop input to be removed before starting the next message if there is one in the stack. Eventually the record-
ing stack will be filled with messages preventing the system from recording new messages. At this point, the
DFT120 will not record nor would it be capable of playing while this Stop control is held active.
Play Control Input
If the Play Mode DIP switch 8 is set to automatic, then this input will have no effect.
When the Play Mode DIP switch 8 is set to manual, the DFT120 is configured for manual/external playback
control. Operating this input will be necessary in order to play back the messages once they are recorded.
A momentary contact closure will initiate the play sequence of all messages currently in memory. A second
play contact closure, while the DFT120 is playing, will initiate the playback for all messages in memory (new
and old) since the last play activation. A maintained contact closure will essentially configure the DFT120 for
automatic playback. Messages cannot be repeated by using the Play control after the sequence has already
been played. Play contacts (pins 2 and 5) of the RJ11 jack and the I/O terminal block (pins 9 and 10) are
internally connected.
Page In Control Input
The Page In input is used for the Dry Audio with Contact Closure activation method. Once the contact clo-
sure is closed, the DFT120 may commence recording depending on the DIP switch 1 and 2 settings. A main-
tained contact closure will be necessary at this input to keep the DFT120 recording. When the contact is
opened, the unit will immediately stop recording. The recorded message must be a minimum of one second
in length. Any message shorter than one second will be deleted. Page In contacts pins 2 and 5 of the RJ11
jack and the I/O terminal block (pins 6 and 1) are internally connected.
Note: Once the DFT120 senses 8 seconds of silence, it will send the busy back tone to the user and abort
the recording. The DFT120 will not be able to record new pages as long as the Page In input is held active.
The user will be informed by the busy back tone that the page has been aborted, prompting them to hang
up. This feature is not defeatable.