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Alcorn McBride MP3 Audio Machine User’s Manual • Rev H • April 2, 2004
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Many of these
commands and error
codes are listed in the
MP3AM’s onboard
menu. Type /? And press
Enter to see it.
The table below shows the complete MP3 Audio Machine serial protocol,
including the Pioneer LDP compatible commands and our extensions. Using
these commands, an external controller or PC can accomplish extremely
complex tasks. Throughout the following table <CR> means carriage return, a
byte with the hexadecimal value of 0D.
Description
Command Bytes
Response
Comments
Play
PL<CR>
R<CR> upon receipt
<CR> upon completion
Automatically stops
at end of track
Pause
PA<CR>
R<CR>
Select File
nSE<CR>
nnSE<CR>
nnnSE<CR>
R<CR>
Only file number
addressing is supported
(not frames or time)
Audio Control
nAD<CR>
R<CR>
0=Mute
1=Unmute
2-9 = Volume level
Play and loop at end of file
LP<CR>
R<CR>
Drive Directory Request
?D<CR>
ASCII dump
Rename File
xxxxxxxxyyy
aaaaaaaabbbRN<CR>
R<CR> upon receipt
R<CR> upon completion
Format Drive
FO<CR>
R<CR> upon receipt
R<CR> upon completion
Total Storage Request
?R<CR>
nnnnnnn<CR>
number of bytes (hex)
Firmware Version Request
?V<CR>
ASCII string
Menu of Commands
/?<CR>
ASCII table
Soft reset the MP3 AM
XX
--
Used during remote control
Notes:
In the commands above, xxxxxxxxyyy and aaaaaaaabbb are file names without the periods.
All R<CR> responses can be replaced by Enn<CR> if an error occurs (see below).
The MP3 Audio Machine responds to the Play command with R<CR> when received, and an additional <CR>
when the track ends. This maintains Pioneer command compatibility while providing completion information.
The MP3 Audio Machine returns the following error codes:
Error Code Description
What to Do:
E00
Communication Error
Check your serial connections
E04
Feature Not Available Yet
Have you entered the correct command? Check for avail.
E11
Media Not Present
Is the Compact Flash inserted? Formatted? A recommended brand?
E12
Search Error
Selecting the correct file? Is the file on the card? Is it named correctly?
E20
Drive Not Formatted
Use the FO serial command to format your card in the unit.
E22
DAC Not Responding
Write down everything you did. Can you repeat the error? (call Alcorn)
E23
Decoder Not Responding
Write down everything you did. Can you repeat the error? (call Alcorn)
E24
Wrong WAV Sample Frequency
Make sure your WAV’s are 32, 44.1, or 48kHz 16bit mono/stereo.
