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