TDU Switch Activated Message Player


Talking Display Unit




Our TDU TALKING DISPLAY UNIT is a completely solid state (no moving parts) Digital Message player, which is specifically designed for a wide range of Interactive Messaging applications. Up to 250 messages can be loaded onto the supplied SD card.

TDU will play a Message as soon as it is Triggered by a Switch, a Sensor or at a User Programmed Time Interval. TDU can play 1 Message only, or you can load up to 250 Messages onto the SD card and 1 Message will play for each remote switch event..

Our Alternative Model TDU/S  has an optional Serial Port (RS232) instead of a Switch Input Port. It will play 1-250 Messages as required under the control of a Remote PC or other Intelligent device.


Typical Applications Include

  • Product Promotion

  • Product Information

  • Message Warnings

  • Any application that requires Accurate, Clear, Flexible Audio Messages


  • Is supplied with a 2GB SD card to hold up to 250 separate Messages

  • Uses MP3 technology to provide exceptional Audio Quality

  • Has a powerful 8W internal amplifier to provide high Message Output volume

  • Has no moving parts to wear out or that require maintenance

  • Is designed to automatically restart after any power interruption

  • Uses a supplied 2GB SD Flash Card to provide for quick and easy Message Change

  • Can be set to Play a Message (or Messages) Automatically at 1-250 minute intervals


TDU plays its Message as soon as it is triggered by a switch, sensor, PIR movement sensor (as used with security equipment) or other switch based accessory that is connected to it.

Its message can then be output through a speaker attached direct to it, or through an existing distributed speaker system.

Further triggering after the message is complete will cause the full message to play again, or if there are additional messages then the next message will play. Each triggering will cause one message to play. Once all messages have been played, TDU will start again from the first message.

TDU can also be set to automatically trigger at user specified time intervals (from 1 to 254 minutes).

Switches or Sensors can be normally open or normally closed and located up to 100 yards from the TDU unit, or greater than 100 yards from the TDU if low resistance wiring is used.

A wide range of 4 or 8 ohm speakers can be used with TDU in order to meet individual customer requirements. Unpowered speakers can be used for localised messaging in small areas. Powered speakers can be used for medium sized areas and amplifiers can be used for large areas.

Installation Diagrams

Installation details when using a Switch



Installation details when using a PIR (Passive Infra Red) sensor

Multiple Zone Operation

Up to 12 Switches and Output Speakers can be used with TDU

Up to 12 separate switches or sensors can be connected to the TDU when the MULTIPLE INPUT UNIT accessory is also used (click link for details).

Up to 12 separate speakers can be connected to TDU when the SPEAKER SWITCHING UNIT accessory is also used (click link for details).





DMC Encryption PC Software

File Encryption Option

Our unique Encryption facility is designed to protect your valuable productions from unauthorised use, editing or copying. .

Encryption is a NO CHARGE option on all Natcomm Digital Audio devices. 

Using Encryption is quick and easy. All you need to do is encrypt your MP3 files using our supplied Encryption program, which takes just a few seconds.

You can Encrypt a single file, or a complete folder of files with a single action. Once your file is encrypted, it cannot be opened, altered or used in any device other than a Natcomm unit which is configured for Encryption.

Similarly, our Encryption devices cannot play standard MP3 files or any file other than those encrypted with our program.

The same Encryption program is used for ALL of our products ensuring standardisation of the processes.


No Charge Option : Message Encryption Facility (model TDU/E)






Time Programmable Message Play Option


DMC Time Programmable Message Programming

Our Optional Model  TDU/T incorporates an Intelligent Timed Programmed Messagge Play.

This facility allows for all Messages contained on the SD card to have individual Days, Times and Date periods where Messages will play when activated via the TDU sensor input port.

The cost of this Optional Facility is $100.00. You can select this Option at the time of order if you wish.


Scheduled Message Play Times  Changes at specific Times and Dates


  • Having Different Messages Play in the Morning, Afternoon or Evening
  • Having a Different Messages Play during for Weekends
  • Having Different Messages play within certain dates (ie SEasonal Messages such as for the Christmas period).
  • Any Combination of the Above


TDU/T Timetables are quickly and easily setup using our Supplied Timetable Setup Program, which is supplied with all TDU/T units.


For further information, please see Time Programmable Message Play Facility 



 User Guides

 Our User Guides contains additional detailed information :

To DOWNLOAD a copy of our TDU USER GUIDE -   Click Here

To DOWNLOAD a copy of our TDU/T USER GUIDE -   Click Here


TDU Switch Activated Message Player


Price: AU $399.00

In stock
(+AU $100.00)