User`s manual

Alcorn McBride Digital Video Machine DVM-7400 User’s Manual Rev 1.5
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Command Protocol
The Serial., Ethernet., Playlist., Scheduler., and GPS. control interfaces
all use the Pioneer./Alcorn McBride Enhanced protocol. This protocol
implements nearly all of the Pioneer Laser Disc player command set, but
adds commands to access advanced features of the DVM as well. This
section discusses the most commonly used commands in detail.
The protocol is ASCII-based. Upper or lower case characters can be
used interchangeably. All commands and responses are terminated
with the Carriage Return character. This character is represented by
the hexadecimal value 0x0D.
Commands sent to
individual units using
the address operator
(@) will receive a
message response,
but a wildcard
message will not.
Addressing Commands
Any command can be preceded by <ID>@ where <ID> is the ASCII
representation of the unit’s Device ID (‘0’-‘126’). This allows commands
to be sent to individual units in a control line of multiple units. The
address ‘127’ and ‘*’ act as wildcard ID’s; a command sent using ‘127’ or
‘*’ as the ID will cause all units in the control line to execute the
command. The Device ID can be assigned at any time using the Set
Device ID command listed in the Command Protocol section.
Playback Commands
Select File
Description: This command causes the DVM to select the specified A/V clip or Playlist. If this is a
video clip, the first frame of that clip is displayed. Once this command is sent, the
next Play command causes the specified file to play from the beginning.
Command Bytes: nnnnnSE or “<filename>”SE
Parameters: nnnnn is the ASCII file number between 0-99999.
<filename> is an ASCII file name surrounded by quotation marks.
Message Response: R
Comments: This is similar to the “Search to Address” command in chapter addressing mode used
in Pioneer Laser Disc protocol. The maximum file number is 99999.
Examples: Select file 215: 215SE
Select file 4: 4SE or “vid00004.mpg”SE
Select file alcorn.mpg: “alcorn.mpg”SE