DTD-16 + G2 – DTMF Decoder w/ Relay Outputs and USB/Serial

The DTD-16 + G2 is a full-featured DTMF tone/sequence decoder that is user programmable to decode single tones or sequences up to six tones in length which can be assigned to any one of eight SPST normally open relays, eight open collectors and the USB/RS-232 serial ports.


The DTD’s relay and open collector outputs can be programmed to close for the duration of tone, pulse immediately after completion of detection, wait a programmed (up to 9.99 seconds) length of time after detection, or latch/unlatch. Programming is performed using a non-dedicated PC’s USB or RS-232 serial port equipped with a serial terminal program like HyperTerminal, Tera Term, or PuTTY.

Product Features

  • Decodes all 16 DTMF tones, or user-programmed tone sequences.
  • 8 SPST relay outputs and 8 open collector outputs triggered by tones or tone sequences.
  • Front panel tone audio input level control with a range of -20 to +24dbu
  • Adjustable tone detection time.
  • Front panel relay status, power, tone activity, program mode, and activity LEDs.
  • Programmed via USB-serial or RS-232 serial connection.
  • Mode configuration via front panel dip-switches.
  • Relay, open collector and tone audio connections on removable euro-block screw terminal connectors to simplify wiring and service, mating plugs are supplied.
  • Fully RFI proofed.
  • Surge protected internal power supply, 9 VDC universal desktop power adapter with IEC inlet included.
  • Up to three units may be mounted on the optional RA-1 rack shelf, using four supplied Velcro feet. Desktop and wall mounting is also possible.