Conex DT-55 Operating manual - page 5
If a DC power supply other than the supplied wall adapter is used, not that the input common and
metal enclosure are connected to the negative side of the DC input jack. Any DC power source
supplying a +8 to 20 VDC at 80 mA may be used.
SETTING THE OTHER SWITCHES
The left two switches (switch positions 1 & 2 on the diagram above) enable two DT-55 options:
If switch #1 is on, then after a power interruption, the relays will retain their previous states when
power is restored. (The relays are magnetic latching) If switch #1 is off, then all relays will be
cleared to their "off" state when power is restored.
Switch #2 puts the DT-55 into the "Interlock Mode". In this mode, only one relay may be on at a
time. If any relay is turned on with a momentary touchtone from the caller, all other relays will be
turned off. This mode would allow the DT-55 to be used as a simple remote-control audio routing
switcher, for instance. In this application, all the relay commons could be tied together and
connected to the audio destination, and all the relay normally open contacts would be connected
to various audio sources.
If switch #2 is off, the DT-55 is in its normal mode, allowing individual control of all 10 relays.
CALLING THE DT-55
When a call is received by the DT-55, the yellow RING LED will light each time the ringing signal
is detected. The call will be answered after the third ring. At this time the LINE LED will light, and
the caller will hear a "beeboop", indicating that the DT-55 has answered the line. If an access
code is required, the code should be entered at this point. If a correct access code is not entered
after three tries, or if more than 48 seconds elapses before a correct code is entered, the DT-55
will hang up.
When access has been granted by the DT-55, the green ACCESS LED will light and the caller
will hear the a rising sequence of three tones ("DoodleBeep"). This is the command prompt,
which signifies that a command may be entered. If the access code feature has been disabled ,
as described above, the green ACCESS LED will light and the command prompt will be heard as
soon as the call is answered.
If no commands are detected for 10 minutes, the DT-55 will hang up. This prevents some un-
foreseen condition, such as a wrong number, from indefinitely causing an off-hook condition. The
DT-55 can be caused to unconditionally hang up with the command * # *.
All the three - tone command prompts may be disabled or re-enabled by pushing the * button four
times. This feature allows slightly faster actuation of the relays. The prompts are automatically
enabled each time the DT-55 is called. A new command should not be entered before the
response tones are over.
CONTROLLING THE RELAYS
After the command prompt, pushing a number key on the phone ( 0 - 9 ) will turn the
corresponding relay on for as long as the key is held down. If the unit is in the "interlock mode", a
momentary key press will latch the selected relay on and turn all others off.
To latch a relay on, simply push the # key followed by the relay number. To turn a relay off, push
the # key twice followed by the relay number.