Alcorn Mcbride AM-4, Hardware And Software Reference Manual

Page: 26 / 77

20 Controlling the AM-4
Advanced Serial Protocol
Many of these commands
and error codes are listed
in the AM4’s onboard
menu. Type /? And press
Enter to see it.
Precede commands with
<ID>@ when the serial
control is shared among
many units.
The table below shows the complete AM-4 Digital 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.
Note: All commands can be preceded with a unique Unit ID byte <ID> followed
by an ‘@’ symbol. This byte is a unique address specified in the Set Unit ID
command, and can be used to communicate to a specific unit connected to a
common RS232C serial bus.
For sake of completeness, all serial commands are listed here. Please refer to
the sections in this manual detailing Ethernet and Scheduler operations for how
serial commands related these functions are used.
Playback Control Commands
Description Command Bytes Response Comments
Play File nPL<CR>
where n = file name or number R<CR> upon receipt
<CR> upon completion Automatically stops
at end of track
Loop File nLP<CR>
where n = file name or number R<CR> upon receipt
<CR> upon loop point Automatically loops
at end of track
Select File nSE<CR>
nnSE<CR>
nnnSE<CR> R<CR> Only file number or name
addressing is supported
(not frames or time)
Play PL<CR> R<CR> upon receipt
<CR> upon completion File needs to be Selected first
using the SE command
Loop LP<CR> R<CR> File needs to be Selected first
using the SE command
Play Next (see note 3) nPN<CR>
where n = file name or number R<CR> upon receipt
<CR> upon completion Cues the file up to play when
currently playing file finishes
Loop Next (see note 3) nLN<CR>
where n = file name or number R<CR> upon receipt
<CR> upon loop point Cues the file up to loop when
currently playing file finishes
Shuffle Play SH<CR>
R<CR> upon receipt
<CR> each completion Shuffle plays all files on
media
Pause PA<CR> R<CR> Issue Play to resume
Announce (see note 3) nAN<CR>
where n = announcement file
name or number R<CR> upon receipt
<CR> upon completion Interrupts a file and plays
announcement. Original file
resumes from where it left off
after announcement.
Set BGM Mode nBG<CR> R<CR> n = 0 Disable BGM Playlist
n = 1 Enable BGM Playlist
Volume Control nAD<CR> R<CR> n = 0 Mute n = * Unmute
n = 1-10 Relative Volume
Level with 10 being loudest.
Volume Fade-In time nnFD<CR>
where nn = fade time in
seconds (0 to 10 seconds) R<CR> Each play will fade up to the
currently-programmed
volume setting over the
specified time
Current Status ?P<CR> P04<CR> = playing
P03<CR> = file searched
P01<CR> = idle