DFT120 Manual - Digital Feedback Terminator - Business Telecom ...

Control & Status Connections
Status Connections
Three status contacts provide feedback about the operation of the DFT120. The
contacts are electrically isolated from the rest of the unit.
IN USE (Terminal 7 - Common, Terminal 8 - N/O*)
This contact is active whenever the DFT120 is performing any function.
This includes recording, playing, pauses, delays and recording access
tones.
PLAYING (Terminal 9 - Common, Terminal 10 - N/O*)
This contact is active while the DFT120 is playing back a page. It will be
active during the pause between the message repeats but not during the
delays between different messages within the play sequence.
RECORDING (Terminal 11 - Common, Terminal 12 - N/O*)
This contact will be closed while the DFT120 is actually recording audio
data into memory. Because of the unit’s audio and DTMF triggering
modes, the unit may not actually start recording at the same time the
record control input is made active.
* The contacts are set for normally open (N/O) when a function
is not active and closed when the function is active. They can
be changed so that they are normally closed and open when
active, see below.
Changing Status Contacts
The DFT120 is factory configured with all status contacts set for normally open
operation (N/O), closed when active. To change any contact:
1. Disconnect the power supply and remove cover.
2. Locate desired status relay (see figure below).
3. Set the relay’s jumper across pins 1 & 2 for N/O operation or across
pins 2 & 3 for N/C operation.
4. Replace the cover and reconnect power supply.
Jumper installed
for N/O Operation
K3
In Use
K2
Play
K1
Rec
Jumper installed for
N/C Operation
1 2 3
JP-3
1 2 3
JP-2
1 2 3
JP-1
6