EM21C User's Manual - Sound Directions France
Contents
1. closed at the end of the file the next file will not start to play To play the next file the input must open then close DHO Play the file for as long as the input is open If the contact is still open at the end of the file the next file will start to play DIM Play the file when the input switches from open to close During playback if the input switches from open to close again stop immediately and starts to play the next file DHM DHB These modes are invalid because Make Break is momentary not holdable DIC DIO These modes will set the system to random play see the Random Play section Background Music firmware version 1 3 and higher If there is a file called 000 mp3 on the flash card the system will automatically starts to loop play it as background music The background music will be interrupted immediately when a valid trigger signal is detected2. resulting in maximum power saving Please note that there are a few drawbacks There will be some noise before and after the playback as the unit powers up and down Only the following modes are supported DNC default DNCQ Random Play Random Play can be achieved by using either the DIC mode for normally open input or the DIO mode for normally closed input The randomness is actually created by the variation in the duration of the momentary opening or closure of the contacts For example pressing a normally open push button in the DIC mode will apply a continuous trigger to the unit causing it to start playing But as soon as the file starts to play it gets interrupted by the continuous trigger so the next file starts to play This process goes on and on until the push button is released At that moment the unit starts to play whichever file it happens to land on Random Play is not available when the unit is in the Timer Mode Trouble Shooting No audio 1 Files must be numbered see the File Numbering section and file 001 must exist 2 File type must be MP3 other types are not supported 3 System configuration MODE TXT may be incorrect 4 Try turning up the volume Does not play the next file Files must be numbered consecutively For example if files are numbered 001 002 and 004 then 004 will never be played since 003 is missing Popping noise before after the playback This is normal for systems working i
3. Timer Mode The system can be made to automatically play at preset fixed intervals This is called the Timer Mode which is configured by using Txx for the configuration letters where xx is a two digit number specifying the interval in minutes For example T60 sets the interval to 60 minutes so the system will automatically play a file every 60 minutes starting from file 001 Although the Timer Mode does not require manual triggering you can still manually trigger the system when it s idle In the idle period the system works as if it s in the DNC mode After the system fullfills the manual triggering the idle period resets restarts from the beginning Q Mode The Q mode is disabled by default and enabled by adding a letter Q as the fourth letter in the configuration file MODE TXT In the Q mode the left channel output is inverted For stereo files this creates a virtual surround For mono files this creates a more powerful differential output but the speaker 8 Ohm recommended for this mode must be connected to the LEFT and the RIGHT terminals instead of the LEFT and the COMMON terminals Battery Mode To save battery life move the jumper from J1 to J2 on the circuit board and tie the TRG trigger and the BSY busy terminals together with a piece of wire Now both terminals become the trigger input while the busy output is no longer available In this mode the whole board is powered down until it s triggered
4. making or breaking the contact between this input and the ground Busy Output This open collector output is activated during audio playback capable of sinking up to 100 mA of current This output can be used to turn on an external relay solenoid that further controls devices such as motors and lamps The busy output is not available when the system is configured for the Battery Mode Volume Knob Turn the knob clockwise to increase the output level It affects both the speaker output and the line out SD Card Both SD FAT16 and SDHC FAT32 cards are supported Files on the flash card should be properly numbered see the File Numbering section Be sure to turn the unit off before inserting the card or the system may not work To remove the card push it again File Numbering Sound files must be numbered uniquely and consecutively starting from 001 even if there is only one file The 3 digit file number must be added in front of the original filename e g 001 Anyname mp3 Files are played in ascending order The first trigger plays file 001 the second trigger plays file 002 and etc If the next number is missing the playback sequence restarts from file 001 which must always exist System Configuration The system can be easily configured with a simple text file called MODE TXT on the flash card If there is no MODE TXT on the flash card the system will operate in the default mode DNC Only three capital letters are needed i
5. n the Battery Mode EM21C User s Manual Technical Specifications Audio Quality CD quality mono stereo Max Output Power 6W mono files in the Q mode or 3W per channel Supported File Types MP3 ISO 11172 3 up to 44 1KHz Trigger Input One input for push button motion sensor or DC control voltage Max Number of Sound Files 99 Flash Card Type Both SD FAT16 and SDHC FAT32 cards are supported Mini and micro SD cards are also acceptable with adaptor Max Flash Card Capacity 2GB for SD 32GB for SDHC Max Recording Time About 34 hours of 128Kbps MP3 audio on a 2GB SD card About 544 hours of 128Kbps MP3 audio on a 32GB SDHC card Supply Voltage 10 15 VDC regulated Typical Standby Current lt 1mA for the battery mode 120mA otherwise Physical Dimensions 3 1 x 2 8 x 1 3 excluding mounting ears Firmware Revision 1 3 Typical Wiring Diagram LINE OUT JACK LEFT SPEAKER SPEAKER COMMON RIGHT SPEAKER a ee BUSY PUSH BUTTON MOTION SENSOR Device Voltage In VOLUME KNOB RELAY Device Voltage Out OPTIONAL Line Out Jack This 3 5mm phone jack provides single ended output for headphone or power amplifier Speaker Outputs The speaker outputs are single ended Load impedance is 4 to 8 Ohms Power amp Ground Be sure the supply voltage is within the specifications or the unit may be damaged Trigger Input Depending on the operation mode the playback is activated by
6. n the MODE TXT file First Letter D Second Letter N or H N Non interruptible The file is played once per trigger and the playback is non interruptible I Interruptible The file is played once per trigger but the playback is interruptible by a new trigger H Holdable The file is played for as long as the trigger is present If the trigger is still present at the end of the file the next file will start to play Third Letter C O M or B C Close Trigger is continuously present for as long as the input is closed tied to ground e g while a ground connected push button is pressed down O Open Trigger is continuously present for as long as the input is open e g while a ground connected push button is not pressed down This option is often used with motion sensors with normally closed contact playback starts when the contact opens motion detected M Make A single momentary trigger is generated when the input switches from open to close e g when a ground connected push button is being pressed down B Break A single momentary trigger is generated when the input switches from close to open e g when a ground connected push button is being released Configuration Examples DNC Play the file uninterruptible when the input is closed If the input is still closed at the end of the file the next file will start to play DNM Play the file uninterruptible when the input is closed If the input is still
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