Flyron FN-BC20 User manual

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20 Channel MP3 Sound Board
User’s Manual
Model: FN-BC20
Contents
1. Overviews ………………………………………………………………………………… 2
1.1. Brief introduction ………………………………………………………………………………………... 2
1.2. Features …………………………………………………………………………………………………. 2
1.3. Technical parameters .................................................................................................................. 2
2. Connections ..........................................................................................…….......... 2
3. Button Control Mode .................................................……………………………… 3
3.1. One-on-one folder triggering control ........................................................................................... 3
3.2. One-on-one sound file triggering control …………………………………………………... ……….. 5
3.3. Trigger mode selection ……………………………………………………………………................... 6
4. Serial Control Mode …………………………………………………………………….. 7
4.1. Command Format …..………………………………………………………………………………….. 7
4.2. About Checksum ………………………………………………………………………………..……… 7
4.3. Serial Communication Commands .............................................................................................. 8
4.4. Returned Data from Module ………….…………………………………………………….…………. 12
4.5. Detailed Annotation of Control Commands ................................................................................. 14
4.6. Detailed Annotation of QueryCommands .................................................................................. 18
4.7. About Delayof Serial Programming ............................................................................................. 19

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1. Overviews
1.1. Brief Introduction
FN- BC20 is a high quality MP3 sound board developed byFlyron TechnologyCo.,Ltd. Equipped with an on-
board 2x15 W class D amplifier, the sound board can be controlled by20 separate buttons hooked up to the
„one-on-one‟ inputs terminals, R232 serial port and RS485 serial port. Great audio output, industry-grade
design andstrong anti-jamming capabilitymake it possible to be used formanydifferent applications.
1.2. Features
1) Built-in a high quality24bit of audio decoder withstereo audio output.
2) Supports to playaudio files of MP3 and WAVformats.
3) On-board a high quality2x15 Watt class D amplifier to directlyconnect with two 8 ohm speakers of 15
Watts or more, for left channel and right channel.
4) Uses SD card or USB flash drive for sound file storage devices.
5) Supports maximum 32GB SD card or 32GB USB flash drive.
6) Supports button controlmode for RS232 and RS485 serial controlmode.
7) In button controlmode, playback of the „one-on-one' associated audio files are triggered bynegative pulse
to anyof the 20 input terminals.
8) In button control mode, possible playback of 255 MP3/WAV audio files per 20 „one -on-one‟ associated
folders through negative trigger.
9) In button controlmode, Four Selectable triggeringmodes are provided.
10) Supports audio output to an external amplifier through the RCAaudio jacks.
11) Separate volume control for eachsound channel (onlyfor on-board amplifier).
12) On-board relayused to control on/offto external equipment during playback.
13) Wide range for power input DC (12V - 24V).
14) Industry-grade design and strong anti-jamming capability.
15) PCB size: 135mm x75 mm (5.315 Inches x2.953 inches).
1.3. Technical Parameters
Power input: DC12V- 24V
Rated output: 15W×2 (RL= 8 Ω d =1%)
Noise Voltage: ≤50m V
Frequencyresponse: 20-20KHz
SNR: ≥ 90dB
2. Connections
K1 through K20 are representing NormallyOpen (N.O.) manual buttons. Please refer to the connection example
below.
Notes:
There are two „GND‟ connecting terminals for convenient connections on the both sides of the 20 input
connection terminals for the buttons.
The volume potentiometer “VOL_L” associates with “SPK1” while the volume potentiometer “VOL_R”
associates with “SPK2”.
The on-board amplifiershuts down automatically, when the on-board RCAaudio jacks are connected to an
external amplifier. This is achieved though voltage sensing of the pre-amp audio source.
The relayis triggered (activated) onlyduring playback.

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Speaker 1 Speaker 2
Left Channel Right Channel
Relayconnectors
RS232 & RS485
Control Ports
RCAaudio pre-amp
Outputs
DC12-24 V
Input
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 K14 K15 K16 K17 K18 K19 K20
GND GND
3. Button Input Control Mode
In order to meet different needs, we added „one-on-one‟ folder triggering control except for the traditional „One-on-one‟ triggering
of sound files. „One-on-one‟ folder triggering control is used for random playback of the sound files in the associated folder. In
other words, each of 20 input triggers can playmultiple sound files in the corresponding folders in random order. The traditional
„one-on-one‟ triggering control mode is that each of the 20 input triggers can only activate a single corresponding sound file.
Both of these two triggering control modes can‟t co-exist.Users can onlychoose one type to use. See more details as below on
how to use both of them.
3.1. ‘One-on-one’ folder triggering control (for random playback of the sound files in the
associated folder)
The SD/USB memorydevices that will contain the audio files must be formatted to FAT32 before loading files and folders. After
formatting is complete, build 20 folders and rename them from “01” to “20” in the root directory of SD card or USB flash drive as
below. The input “K1” associates with folder “01”, the input “K2” associates with folder “02”...... the input“K20” associates with
folder “20”.

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Put the sound files in each folder, which can contain maximum 255 sound files. Each folder must contain all Mp3 OR Wav audio
files. Mp3 and Wavcannot co-exist within each folder. Rename them “001.mp3/wav” to “255.mp3/wav” as shown below. For the
quickest timelyresponse once triggered; wesuggest that nomore than 100sound files in each folder.
After everything is done as above, remove the SD card or USB flash drive from computer and insert it in to the board. Power it on
and push anyof the 20 buttons to playa sound randomlyin the associated folder. For example, bypushing the button associated
with input “K7”. It will randomly play a sound file from the associated folder “07” and stop; push it again, it will randomly play
another sound file from the associated folder “07” and stop, etc.
Note: When both the SD card and USB drive is plugged/inserted into the soundboard. Only audio files from the SD card willbe
played.

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3.2. ‘One-on-one’ sound file triggering control (for direct playback of the associated sound file)
The 20 sound files need to be directlystored in the root directoryof the SD card or USB flash drive being used. No other folders
can be in the „root directory‟. The arrangements of the sound files are managed by a physical indexing sequence. In other words,
the file that is to be loaded first in the storage device will be associated with input “K1”. The last file to be loaded in thestorage
device will be associated with input “K20”. In order to guarantee a correct „one -on-one‟ order, please refer to the following steps.
1) Build a new folder on the computer and put 20 sound files in this new folder.
2) Rename the audio files from 001.mp3/wav to “020.mp3/wav”, and make sure they are ranked from “001.mp3/wav” to
“020.mp3/wav” in order.
3) Plug in your SD card or USB flash drive on computer (makesure i t is empty).
4) Format SD card or USB drive into „FAT32‟.
5) Select all thesound files in the folder.
6) Right click on the first file (001.mp3/wav) and choose "Send to removable disk".
7) This should send the 20 sound files to the SD card or USB flash drive in a correctsequence as below.
8) Once the files transfer is complete, safelyremove the SD card or USB flash drive from computer and insert it onto the
sound board.
9) Applypower to the sound board and push anyof 20 buttons to playa correspondingsound.
10) For example, push button “K1”, it will play the sound file “001.m p3/wav” and stop; push button “K7”, it will play the sound
file “007.mp3 /wav” and stop, etc.

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3.3. TriggeringMode Selection
Byusing the on-board DIP switches, users have 4 triggering modes to choose from:
Pulse interruptible
Level hold
Pulse Uninterruptible
Play/Pause
The DIP switches are placed in the center of circuit board and a truth table for the DIP switch is a printed on the circuit board just
right of the DIP switches. The truth table is also shown below.
DIP Switch Stat us
Triggering Mode
No.1
No.2
OFF
OFF
Pulse Interruptible
ON
OFF
Level Hold
OFF
ON
Pulse Uninterruptable
ON
ON
Play/Pause
Pulse interruptible: In this mode, a single negative pulse willstart andstop playback. It is possible to
interrupt the playback by pressing the same button used to activate it. Once playback is stopped, pressing
the button again will restart the sound file. (If more than one audio file is in the folder. The next audio file to
be played willbe picked/chosen at random.)
Level hold: In this mode, the negative pulsemust be held/maintained to the sound board trigger for audio
file to complete. The audio file will only playback while button, or negative pulse, is held/maintained during
playback. Once the button being held, or negative pulse, is removed, the playback willbe
stopped/cancelled. (Ifmore than one audio file is in the folder. The next audio file to be play will be
picked/chosen at random. Regardless if the last/previous audio file was completed.)
Pulse Uninterruptible: In this mode, it's not possible to interrupt the playback. Once an audio file is triggered.
The audio file will not be able tobe stopped/cancelled during playback. The playback will only end when
the audio file has played in its entirety. (If more than one audio file is in the folder. The next audio file tobe
play willbe picked/chosen at random.)
Play/Pause: In this mode, a single negative pulse willstart and pause the playback. Once an audio file is
triggered. Pushing the samebutton, or reapplying a negative pulse, that triggered the playback, will pause
playback; pushing the same button, or reapplying a negative pulse, will to continue the original audio file
playback.
Note: The factory default triggering mode is “pulse interruptib le". After you shift to another triggering mode, you need to power
cycle the board on-off-on, then the newDIP switch setting willbe executed.

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4. Serial Control Mode
Supports RS232 and RS485 serial control modes. Both of these two control modes share the same
communication protocols as below. Regarding RS485, we employed half-duplex communicationstandard.
4.1. Command Format
Communication baud rate: 9600 bps
Data bits: 1
Checkout: none
Flow Control: none
Format: $S / Ver. / Number / Command / Feedback / Param_MSB/ Param_LSB/ Check_MSB/ Check_LSB/ $O
$S
Start byte 0x7E
Ver.
Version byte, 0xFF by default
Number
Number of bytes from version info to Check_LSB, typically0x06 (checks um not counted)
Command
Command byte
Feedback
0x01: Need feedback --send confirmation back to MCU; 0x00: No need feedback
Param_MSB
Most significant byte of parameter
Param_LSB
Least significant byte of parameter
Check_MSB
Most significant byte of checksum
Check_LSB
Least significant byte of checksum
$O
End byte 0xEF
For example, if we specify playback of SD card, we need to send the command “7E FF 06 09 00 00 02 FF F0 EF”. The number
is 6 bytes, and these 6 bytes are “FF 06 09 00 00 02”. Start byte, end byte and checksum are not counted.
4.2. About Checksum
Regarding to calculating checksum, set your 16 bit checks um value to 0. For each byte from the Version byte until the
Param_LSB byte, subtract the byte from the checksum.
Normally it‟s okay whether users choose to use checksum or not, our module can receive serial data with or without checksum,
but some of users mayuse a MCU without crystal oscillator, so if so we stronglysuggest users to add checksum to makesure
the communicationstability.

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4.3. Serial Communication Commands
4.3.1 Control commands
Command
Function
Remarks
0 x01
PlayNext
0 x02
PlayPrevious
0 x03
Specifyplayback of a track
See 4.5.1 for details
0 x04
Increase volume
0 x05
Decrease volume
0 x06
Specify volume
See 4.5.2 for details
0 x07
N/A(reserved)
0 x08
Specifysingle repeat playback
See 4.5.3 for details
0 x09
Specifyplayback of a device
See 4.5.4 for details
0 x0 A
Set sleep mode
See 4.5.5 for details
0 x0B
Awake from sleep
0 x0C
Reset
0 x0D
Play
0 x0E
Pause
0 x0 F
Specifyplayback of a track in a folder
See 4.5.6 for details
0 x13
Inter-cut an advertisement
See 4.5.7 for details
0 x14
N/A(reserved)
0 x15
Stop playing inter-cut advertisement
See 4.5.8 for details
0 x16
Stop
0 x17
Specifyrepeat playback of a folder
See 4.5.9 for details
0 x18
Set random playback
See 4.5.10 for de tails
0 x19
Set repeat playback of current track
See 4.5.11 for de tails
0 x21
Combination playback (playback of a group)
See 4.5.13 for de tails
0 x22
Specifyplayback of a track with a specific volume level
See 4.5.14 for de tails

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4.3.2 Examples of sending control commands
Command Description
Serial Commands
[with checksum]
Serial Commands
[without checksum]
Notes
PlayNext
7E FF06 01 00 00 00 FE FA EF
7E FF06 01 00 00 00 EF
PlayPrevious
7E FF06 02 00 00 00 FE F9 EF
7E FF06 02 00 00 00 EF
Specifyplayback of a track
(under the root directory)
7E FF06 03 00 00 01 FE F7 EF
7E FF06 03 00 00 01 EF
Specifyplayback of the 1st track
7E FF06 03 00 00 02 FE F6 EF
7E FF06 03 00 00 02 EF
Specifyplayback of the 2nd track
7E FF06 03 00 00 0 AFE EE EF
7E FF06 03 00 00 0 AEF
Specifyplayback of the 10th track
Increase volume
7E FF06 04 00 00 00 FE F7 EF
7E FF06 04 00 00 00 EF
Decrees e volume
7E FF06 05 00 00 00 FE F6 EF
7E FF06 05 00 00 00 EF
Specify volume e
7E FF06 06 00 00 1 E FE D7 EF
7E FF06 06 00 00 1 E EF
Specified volume is level 30
Specifysingle repeat
playback (under the root
directory)
7E FF06 08 00 00 01 FE F2 EF
7E FF06 08 00 00 01 EF
Repeatedlyplaythe 1st track
7E FF06 08 00 00 02 FE F1 EF
7E FF06 08 00 00 02 EF
Repeatedlyplaythe 2nd track
7E FF06 08 00 00 0 AFE E9 EF
7E FF06 08 00 00 0 AEF
Repeatedlyplaythe 10th track
Specifyplayback of a
7E FF06 09 00 00 01 FE F1 EF
7E FF06 09 00 00 01 EF
Specified device is USB flash disk
device
7E FF06 09 00 00 02 FE F0 EF
7E FF06 09 00 00 02 EF
Specified device is SD card
Set sleep mode
7E FF06 0 A00 00 00 FE F1 EF
7E FF06 0 A00 00 00 EF
Awake from sleep
7E FF06 0B 0 0 0 0 00 FE F0 EF
7E FF06 0B 0 0 0 0 00 EF
Reset
7E FF06 0C 00 00 00 FE EF EF
7E FF06 0C 00 00 00 EF
Play
7E FF06 0D 00 00 00 FE EE EF
7E FF06 0D 00 00 00 EF
Pause
7E FF06 0E 0 0 0 0 00 FE ED EF
7E FF06 0E 0 0 0 0 00 EF
Specifyplayback of a track
in a folder
7E FF06 0 F 00 01 01 FE E A EF
7E FF06 0 F 00 01 01 EF
Specify track "001" in the folder “01”
7E FF06 0 F 00 01 02 FE E9 EF
7E FF06 0 F 00 01 02 EF
Specify track "002" in the folder “01”
Inter-cut an advertisement
7E FF06 13 00 00 01 FE E7 E F
7E FF06 13 00 00 01 EF
Inter-cut track "0001" in the folder
“ AD VERT”
7E FF06 13 00 00 02 FE E6 EF
7E FF06 13 00 00 02 EF
Inter-cut track "0002" in the folder
“AD VERT”
7E FF06 13 00 00 FF FD E9 EF
7E FF06 13 00 00 FF EF
Inter-cut track "0255" in the folder
“AD VERT”
Stop playing inter-cut
advertisement
7E FF06 15 00 00 00 FE E6 EF
7E FF06 15 00 00 00 EF
Go back and continue to playthe
music interrupted
Stop
7E FF06 16 00 00 00 FE E5 EF
7E FF06 16 00 00 00 EF
Stop all playback tasks
Specifyrepeat playback of a
folder
7E FF06 17 00 02 00 FE E2 EF
7E FF06 17 00 02 00 EF
Specifyrepeat playback of the folder
“02”
7E FF06 17 00 01 00 FE E3 EF
7E FF06 17 00 01 00 EF
Specifyrepeat playback of the folder
“01”
Set random playback
7E FF06 18 00 00 00 FE E3 EF
7E FF06 18 00 00 00 EF
Random playback of the whole
device

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4.3.2 Examples of sending control commands (Continued)
Command Description
Serial Commands
[with c heck sum]
Serial Commands
[without c heck sum]
Notes
Set repeat playback of
current track
7E FF06 19 00 00 00 FE E2 EF
7E FF06 19 00 00 00 EF
Turn on single repeat playback
7E FF06 19 00 00 01 FE E1 EF
7E FF06 19 00 00 01 EF
Turn off single repeat playback
Specifyplayback of a track
with a specific volume level
7E FF 06 22 00 1 E 01 FE B A EF
7E FF06 22 00 1 E 01 EF
Play1st track with volume level 30
7E FF06 22 00 0 F 02 FE C8 EF
7E FF06 22 00 0 F 02 EF
Play2nd track with volume level 15
4.3.3 Query commands
Command
Function
Rem arks
0 x3F
Querycurrent online storage device
See 4.6.1 for details
0 x40
Module returns an error data with this command
0 x41
Module reports a feedback with this command
0 x42
Querycurrent status
See 4.6.2 for details
0 x43
Querycurrent volume
0 x44
N/A(Reserved)
0 x45
N/A(Reserved)
0 x46
N/A(Reserved)
0 x47
Querytotal track numbers in USB flash disk
0 x48
Querytotal track numbers in SD Card
0 x4B
Querycurrent track in USB flash disk
byphysical sequence
0 x4C
Querycurrent track in SD Card
byphysical sequence
0 x4E
Querytotal track numbers in a folder
See 4.6.3 for details
0 x4F
Querytotal folder numbers in thestorage device
See 4.6.4 for details

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4.3.4 Examples of sending query commands
Command Description
Serial Commands
[with c heck sum]
Serial Commands
[without c heck sum]
Notes
Querycurrent online storage
device
7E FF06 3F 00 00 00 FE BC EF
7E FF06 3F 00 00 00 EF
Querycurrent status
7E FF06 42 00 00 00 FE B9 EF
7E FF06 42 00 00 00 EF
Querycurrent volume
7E FF06 43 00 00 00 FE B8 EF
7E FF06 43 00 00 00 EF
Querytotal track numbers in USB
flash disk
7E FF06 47 00 00 00 FE B4 EF
7E FF06 47 00 00 00 EF
Total file numbers of
current device
Querytotal track numbers in SD
card
7E FF06 48 00 00 00 FE B3 EF
7E FF06 48 00 00 00 EF
Total file numbers of
current device
Querycurrent track in USB flash
disk
7E FF06 4B 00 00 00 FE B0 EF
7E FF06 4B 00 00 00 EF
Querythe track being
played
Querycurrent track in SD card
7E FF0 6 4C 00 00 00 FE AF EF
7E FF06 4C 00 00 00 EF
Querythe track being
played
Querytotal track numbers in a
folder
7E FF06 4E 00 00 01 FE AC EF
7E FF06 4E 00 01 00 EF
Querytotal folder numbers in
current storage device
7E FF06 4F 00 00 00 FE AC EF
7E FF06 4F 00 00 00 EF
SD card or USB flash
disk

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4.4. Returned Data fromModule
4.4.1 Returned data after the module is powered on
1) After the module is powered on, normallyit needs about nomore than 500ms to 1500m s (depending on the actual track
quantities in thestorage device) initialization time. Once the initialization is done, themodule returns a data to MCU. If it
does not return a data after more than the initialization time, it means there is an error for initialization, and please check
the hardware connections.
2) The returned data from module after initialization means the current effective s to rage device /online equipment. For
example, the module returns 7 E FF06 3 F 00 00 03 xx xxEF. 0x3F is the returned command bymodule, and 0x03
represents USB flash and SD card are effective online at thesametime. See the details as below.
Online Equipment Re turned Da ta
USB flash online
7E FF06 3 F 00 00 01 xx xxEF
SD car d online
7E FF06 3F 00 00 02 xx xx EF
PC online
7E FF06 3F 00 00 04 xx xx EF
USB flash and SD card online
7E FF06 3F 00 00 03 xx xx EF
3) MCU cannot send commands to control themodule until the initialization of the module is done and a data is returned,
otherwise the commands sent by MCU will be ignored and also this will effect initializing of the module.
4.4.2 Returned data aftera track is finished playing
Track Played
Returned Data
1st track is finished playing in US B flash
7E FF06 3C 00 00 01 xx xxEF
2nd track is finished playing in U SB flash
7E FF06 3C 00 00 02 xx xxEF
1st track is finished playing in SD card
7E FF06 3D 00 00 01 xx EF
2nd track is finished playing in SD card
7E FF06 3D 00 00 02 xx xxEF
1) There is a returned data after a track is finished playing. For example, the returned data is 7E FF 06 3C 00 00 01 xx xxEF.
0x3C represents USB flash and 0x3D represents SD card. 0x00 and 0 x01 represents the 1st track. 0x01 and 0xF4 represents
the 500thtrack (0x01F4=500).
2) Because all of the files (tracks) in the storage device are read in physicalsequence, the returned datastill follow the physical
sequence, which needs to be noted.

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4.4.3 Returned data of feedback frommodule
Module returns ACK 7E FF 06 41 00 00 00 xx xx EF
1) In order to enhancestabilitybetween data communication, the function of a feedback from module is added. Once there is a
feedback to MCU from themodule, it means themodule has successfullyreceived the command that MCU sent out. 0x41 is
the returned command bymodule.
2) Users are free to choose this feedback or not. It‟s also fine not to choose this function.
4.4.4 Returned data of errors
Returned Data of Errors
Meaning Description
7E FF06 40 00 00 01 xx xxEF
Module busy(this info is returned when the initialization
is not done)
7E FF06 40 00 00 02 xx xxEF
Currentlysleepmode (supports onlyspecified device in
sleepmode)
7E FF06 40 00 00 03 xx xxEF
Serial receiving error (a frame has not been received
completely yet)
7E FF06 40 00 00 04 xx xxEF
Checksum incorrect
7E FF06 40 00 00 05 xx xxEF
Specified track is out of current track scope
7E FF06 40 00 00 06 xx xxEF
Specified track is not found
7E FF06 40 00 00 07 xx xxEF
Inter-cut error (an inter-cut operation onlycan be done
when a track is being played )
7E FF06 40 00 00 08 xx xxEF
SD card reading failed (SD card pulled out or damaged)
7E FF06 40 00 00 0A xx xxEF
Entered in tosleepmode
When the module is powered on, it reads SD card first and if SD card is not available it goes to USB flash drive.
4.4.5 Returned data aftera storage device is plugged in or pull out
Stat us
Re turned Da ta
USB flash is plugged in
7E FF06 3A 00 00 01 xx xxEF
SD card is plugged in
7E FF06 3A 00 00 02 xx xxEF
USB cable connected to PC is plugged in
7E FF06 3A 00 00 04 xx xxEF
USB flash is pulled out
7E FF06 3B 00 00 01 xx xxEF
SD card is pulled out
7E FF06 3B 00 00 02 xx xxEF
USB cable connected to PC is pulled out
7E FF06 3B 00 00 04 xx xxEF
0x3A represents a device is plugged in while 0x3B represents a device is pull out.0x01, 0x02, 0x04 represent
USB flash, SD card and USB cable connected to PC respectively.

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4.5. Detailed Annotation of Control Commands
4.5.1 Specifyplayback ofa track (under the root directory of the storage device)
The available selectable tracks are from 1stto 3000thunder the root directoryof the storage device. Actuallyit can support more, but
if we make it supportmore, the operation speed will becomeslow. Usuallymost of applications do not need to supportmuch more
files. Normallyif the total track quantityis under 1,000 in thestorage device the responsespeed of the module is quicker than
50ms. Ifthe total track quantity is more than 1000 the response speed is a little slower than 100ms.
1) For example, if set the first track to be played, send the command 7E FF 06 03 00 00 01 FE F7 EF
7E -- - Start byte
FF -- - Version Information
06 --- Number of bytes
03 --- Actual command (specifyplayback of a track)
00 --- 0 x01 : need feedback ;0 x00 : no need feedback
00 --- Most significant byte of the track (MSB of Parameter)
01 --- Least significant byte of the track (LSB of Parameter) FE --- Most significant byte of checksum
(MSB of checksum) F7 - -- Least significant byte of checksum (LSB of checksum ) EF --- End byte
0xEF
2) Regarding track selection, if the 100thsong (track) is selected to be played, firstlyconvert 100 to
hexadecimal. It is double-byte bydefault, i.e. 0 x006 4. MS B=0 x00 ; LS B=0 x64
4.5.2 Specify volume
1) Our system power-on default volume is level 30, if you want to set the volume, then directly send the
corresponding command.
2) For example, if specifythe volume to level 15, send the command 7E FF 06 06 00 00 0F FFD5 EF.
3) MSB=0x00; LSB=0x0F, 15 is converted to hexadecimal 0x000 F.
4.5.3 Specifysingle repeat playback (under the root directory of the storage device)
Repeatedlyplay1s t track
7E FF 06 08 00 00 01 xx xxEF
Repeatedlyplay2ndtrack
7E FF 06 08 00 00 02 xx xxEF
Repeatedlyplay3r dtrack
7E FF 06 08 00 00 03 xx xxEF
During single repeat playback, you can still normallyexecute the operations Play/Pause, Previous, Next, Volume +/-
and repeat playback. Users canspecifysingle track playback or send thestop command to turn offsingle repeat
playback status.

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4.5.4 Specify playback of a device
Specifyplayback of USB flash
7E FF06 09 00 00 01 FE F1 EF
Specifyplayback of SD card
7E FF06 09 00 00 02 FE F0 EF
1) The module supports two types of playback devices (USB flash and SD card). The devicemust be on-line
so it can be specified playback. It automaticallydetects if a device is on-line or not.
2) Itautomaticallyenters into the standby status after specifying a device, waiting MCU to specifya track to
play. It takes about 200ms from specifying device to the module finishes initialization of filesystem. Please
wait for 200ms and thensend thespecified command to playa track.
4.5.5 Set sleep mode, awake from sleep and reset
Set sleep mode
7E FF06 0A 00 00 00 FE F1 EF
Awake from sleep
7E FF06 0B 00 0 0 00 FE F0 EF
Reset 7E FF 06 0C 00 00 00 FE EF EF
1) After set the module enter intosleepmode, there is also other two ways other than sending the command
to awake themodule.
a. Specifyplayback of the storage device, either USB flash or SD card.
b. Pull out thestorage device and re-plug it in.
2) The reset is asoft reset. The reset time is 5-8seconds. This allows the reset command under anystatus.
Note:When the module enters into the sleep mode, the standby power consumption is about 10mA. If users are very strict
to the power consumption, you can use a MOS and a transistor to control power supply of the module. It is possible to cut
off the power supply completely when standby is not necessary.Please refer to theschematic as below.

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4.5.6 Specify playback of a track in a folder
Specifyplayback of track 001 in the folder 01
7E FF06 0F 00 01 01 xx xx EF
Specifyplayback of track 100 in the folder 11
7E FF06 0F 00 0B 64 xx xxEF
Specifyplayback of track 255 in the folder 99
7E FF06 0F 00 63 FF xx xxEF
1) The default folders are named as "01", "11", and “99” in this way. In order to be with better system stability,
it is made to supportmaximum 99 folders andmaximum 255 tracks in each folder. For example:
If specify to play “100.m p3” in the folder "01", send the command 7E FF 06 0F 00 01 64 xx EF MSB:
represents the name of the folder, maximum supports 99 folders from 01 - 99. LSB: represents the
track, maximum supports 255 tracks from 0x01 to 0xFF
You must specifyboth the folder and the file name to target a track. This featuresupports MP3 and
WAV audio formats.
The following two images illustrate namingmethod of folders and files.
4.5.7 Inter-cut anadvertisement
Inter-cut track "0001" in the folder “ADVERT”
7E FF06 13 00 00 01 FE E7 EF
Inter-cut track "0002" in the folder “ADVERT”
7E FF 06 13 00 00 02 FE E6 EF
Inter-cut track "0255" in the folder “ADVERT”
7E FF06 13 00 00 FF FD E9 EF
Inter-cut track "1999" in the folder “ADVERT”
7E FF06 13 00 07 CF FE 12 EF
Inter-cut track "3000" in the folder "ADVERT”
7E FF06 13 00 0B B8 FE 25 EF
1) This module supports inter-cut advertisements during playback of a track, so that it can meetsome special
needs forsome applications.
2) After sending the command 0x13, the system will save the ID V3 information of the track being played and
pause, and then it will playthe specified inter-cut track (advertisement). When the inter-cut track is finished,
the system will go back and continue to playthe track that was interrupted until to the end.
3) The setting method is build a folder named “ADVERT” in the storage device and put the tracks (ads) you
need in the folder and name the files as “0001 .mp3/wav”, 0002.mp3/wav.
4) If you send an inter-cut command when the module is at Pausestatus or Stopstatus, it will not work and
there will be returned error information. In the course of an inter-cut,you can continue to intercut the other
tracks (ads). When the last inter-cut track goes to the end, the systems till goes back to the ID V3 position
saved at the first time.

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4.5.8 Stop
Stop playing inter-cut advertisement
7E FF06 15 00 00 00 FE E6 EF
Stop
7E FF06 16 00 00 00 FE E5 EF
During playback of the module, there are twomodes to stop. One is to stop playing the inter-cut advertisement,and go back and
continue to playthe music interrupted and the othermode is to stop all playback (stop decoding). For example, suppose the
module is playing an inter-cut advertisement and now ifsend a stop command 0x16, it will stop all playback tasks.
4.5.9 Specify repeat playback of a folder
Specifyrepeat playback of the folder “02”
7E FF06 17 00 00 02 FE E2 E F
Specify re pea t playback of the folder “01”
7E FF06 17 00 00 01 FE E3 E F
The folder names must be 01- 99, and no more than 99. After sending the command, it repeatedlyplays the tracks in the specific
folder and it will not stop until it receives a command tostop.
4.5.10 Set random playback
Random playback of the whole s to rage de vice 7E FF 06 18 00 00 00 FE E3 EF
This command is used to randomlyplayall of the tracks in the storage device according to physical sequence and nomatter if
there is a folder or not in the device.
4.5.11 Set repeat playback of current track
Turn on single repeat playback
7E FF06 19 00 00 00 FE E2 EF
Turn off single repeat playback
7E FF06 19 00 00 01 FE E1 EF
During playback, send the turn-on command, and it will repeatedlyplaythe current track. If the module is at Pause or Stopstatus,
it will not respond to this command. If you need to turn off repeat playback, just send the turn-off command.
4.5.13 Combination playback (playback of a group)
1) We added this function to meet some users‟ special need that when users need to send only one frame data to play
multiple tracks one byone without pause. Itsupports maximum 15 tracks together for combination playback. All of the
sound files used for combination playback need to be put in folders (folder 01 -folder 99).
2) If MCU sends a frame data as 7E FF 15 21 01 0201 0301 0401 0501 0602 0103 0504 0705 09 EF, see the
analysis as below.
Command: 0x21
Number of bytes : 0x15=21 bytes - -- FF 15 2 1 01 0201 0301 0401 0501 0602 0103 0504 0705
09(two parameters for one track, i.e. the folder number and the track number)
The module will playtrack 002 in folder 01, track 003 in folder 01, track 004 in folder 01, track 005 in
folder 01, track 006 in folder 01, track 001 in folder 02, track 005 in folder 03, track 007 in folder 04 ,
and track 009 in folder 05 .

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3) During combination playback, it is allowed to Play/Pause andset volume, but not allowed to set previous
and next. If need stop, just direct send the Stop command. And it is not allowed to playanother group of
combination during it is working. Users need tosend the stop command to stop the current combination
playback before start another group of combination playback.
4) Ifa track specified to be played in combination is not in the folder, it willstop playing at this track position,
so please makesure the trackspecified to playmust be available in the folder.
5) Ifusers are verystrict to the combination playback, please edit the sound sources withsome audio edit
software like Adobe Audition or GoldWave to cut off the silence at the beginning and end of the sound file.
4.5.14 Specify playback of a track with a specific volume level (under the root directory)
Play1st track at volume level 30
7E FF06 22 00 1E 01 FE BA EF
Play2nd track at volume level 15
7E FF06 22 00 0F 02 FE C8 EF
1) This function is added to meet some users‟ needs to play a track at a specific volume level wi th one
command only,but this onlycan be executed for the tracks under the root directoryof the storage device.
The command is 0x22.
2) For normal operations, users still need to send the volume command first and thenspecifyplayback of a
track with the corresponding command likemost of MP3 players.
4.6. Detailed Annotation of QueryCommands
4.6.1 Query current online storage device
Query current online storage device 7E FF 06 3F 00 00 00 FE BC EF
When the module is working, users can use the command as above (0x3F) to query the status of the online storage devices. For
example, if the module returns the data 7E FF06 3F 00 00 0A xx xx EF, LSB 0x0A(0000 1010) represents SD card online. If LSB
is 0x1F (0000 1111), it represents all of USB flash, SD card and PC online (PC online means module is connecting with PC via a
USB cable).
4.6.2 Query current status
Query current online storage device 7E FF 06 42 00 00 00 FE B9 EF
1) There are 4status (playing, paused playing, stopped playing and insleep) that can be queried during the
module is decoding. Users can querythe current status via sending the command as above (0 x42).

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2) Interpretation of returned data
Returned Data
Status
7E FF06 42 00 01 01 xx xxEF
USB flash is being played
7E FF06 42 00 02 02 xx xxEF
SD card is paused playing
7E FF06 42 00 01 00 xx xxEF
USB flash is stopped playing
7E FF06 42 00 10 00 xx xxEF
Module in sleep
3) MSB and LSB Representations
MSB Representation
LSB Representation
0x01
USB flash
0x00
Stopped
0x02
SD card
0x01
Playing
0x10
Module in sleepmode
0x02
Paused
4.6.3 Query total track numbers in a folder
Querytotal track numbers in folder 01
7E FF06 4E 00 00 01 FE AC EF
Querytotal track numbers in folder 11
7E FF06 4E 00 00 0B FE A2 EF
Ifthe folder queried is emptywithout anyfiles, the module will report an error and the data 7E FF 06 40 00 00 06 FE B5 EF will be
returned.
4.6.4 Query total folder numbers in current storage device
Querytotal folder numbers in current storage device 7E FF 06 4 F 00 00 00 FE AC EF
Users can querythe total folder numbers of the currentstorage device through sending the command above. This just supports to
querythe folder numbers under the root directoryof the device. Not possible to querythe sub-folder numbers (Please do not build
anysub-folders under a folder).
4.7. About Delay of Serial Programming
1) After the module is powered on, it needs about 500ms to 1500ms (depending on the track quantities in the
storage device) to initialize. After that, some data related to initialization returns to MCU. Users can choose to
ignore these data.
2) After specifying playback of a device (SD card or USB flash), it needs 200ms delaybeforesending the
command to execute the relative operation.
3) The module processes a serial data per 10ms,so when MCU continuouslysends commands one byone,
20ms delaymust be added beforesending next command, otherwise the command MCU sends out will not
be executed.
4) Ifspecifying playback of a track in a folder, the delaymust be longer than 40ms, as it needs time to target a
track in a folder. And even so song as sending the commands related to querya track or a folder, 40ms delay
is required.