DT-55
Telephone Access Remote Control and
Status Monitoring System
The Conex DT-55 answers a phone line, accepts a user access code, then allows remote control
of ten SPDT relays and remote monitoring of ten external switch contacts or logic levels. The DT-
55 is simple to understand, simple to install, secure, and effective.
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Compact 9.43" x 1.13" x 2.9"
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Magnetic latching relays. On power loss and restoration, the relays can retain their prior
states or return to the de-activated state. Each relay can be set, cleared or activated
momentarily ( for the duration of the push-button actuation on the calling telephone ).
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Relay interlock mode allows easy use as a remote-controlled audio selector.
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All IC's and relays plug in for easy maintenance.
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Miniature screw-clamp terminal strips for easy connection to your external circuits -- no
crimp pins, spade lugs or special tools required.
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Switch-selectable four-digit access code (can be disabled if desired).
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Easily distinguishable tones indicate the high-low or open-closed status of the ten
external inputs. Each input is individually polled by the user.
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Status lights indicate ringing signal, power, DTMF tone detection, line-connected status,
and access granted.
BASIC OPERATION
The DT-55 allows the remote control of 10 SPDT relays from any Touch-Tone telephone
standard telephone network. It also allows the user to check the status of 10 logic-level or switch
contact inputs, through easily distinguishable audio tones.
The DT-55 is connected to a phone line with a standard 6 position modular cable. When the DT-
55 is called, it will answer after the 3rd ring. If the access code feature is enabled, the caller will
hear the access code prompt, a “beep boop”. When the correct access code is entered, the caller
will hear the 3 tone “command prompt”.
At this time the caller may turn any of the relays on or off using the Touch- Tone keys on the
telephone, request the status of any relay, or request the status of any of the 10 logic inputs. The
