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DTMF-TX -- Contact Closure to DTMF Encoder
The DTMF-TX is a DTMF audio encoder which sums a cue tone sequence of up to five digits onto an audio source. Audio is looped through the DTMX-TX and mutes whenever cues are transmitted. By applying a relay closure to the DTMF-TX input, a "start" sequence is generated. Removing the closure generates a "stop" sequence.

DTMF-RX -- DTMF to Contact Closure Decoder
The DTMF-RX is a DTMF audio decoder which detects the cues generated by the DTMF-TX and operates an on-board relay. Audio is looped through the system and, when the "start" sequence is detected, the system closes it's relay. The relay opens upon detection of the "stop" sequence.

The DTMF-TX and DTMF-RX can be used to generate tones to operate external equipment or to detect tones from any source. Applications include transporting a relay closure to a remote location, remote signaling, and local commercial insertion requirements.


Audio Level: -2 to +3 dB
Impedance: 600 ohm balanced
Connectors: removable barrier strip
DTMF-TX Relay Capacity: 250 mA
DTMF-RX Relay Capacity: 1 A
Indicators: power LED
  relay closed LED
Power Requirements: 12 VDC, 300 mA
Size: 4.75" x 2.75" x 1.5"
*Specifications are subject to change without notice.

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