Edit
Suite Audio Mixer Protocols
The Edit Suite Audio Mixer protocol was first
published by Graham-Patten Systems in 1986.
The protocol was based on the SMPTE ESBus standard and made generic
in nature in an effort
to encourage adoption by other equipment manufacturers. This approach
was successful and
Serial II (ESAM II) has now become the industry standard for control
of Edit Suite Audio Mixers.
When four-channel digital VTRs were introduced
into the edit suite, the Serial II protocol was
extended to allow four and eight channel support. With the introduction
of the D/ESAM 800
Digital Edit Suite Audio Mixer by Graham-Patten Systems in 1989, the
protocol was extended
further still to support some of the more advanced features of the 800.
The revisions were made
as generic as possible in order to maintain the usefulness of the protocol
as an industry
standard.
The power of the D/ESAM 800 audio engine
has led to its use in OEM machine control
applications. A protocol called Serial 3 was developed which extends
the functionality of the
Serial II protocol to support these applications. This protocol is completely
backward-compatible
with Serial II and responds to the same SMPTE address. Currently all
D/ESAM
820 audio
mixers support the Serial 3 extensions of the Serial II protocol.
With the continuing success of the D/ESAM
line of audio mixers, it soon became apparent that
a new, more specific, protocol was needed. The new D/ESAM IV protocol
has been developed
by Graham-Patten Systems to fill this need. It allows edit systems to
fully control most
D/ESAM functions through the serial port. While less general than the
Serial II protocol, where
possible the existing Serial II commands have been left as they are
or extended in a logical
fashion. The remainder of the D/ESAM IV protocol consists of new commands
providing full
access to the D/ESAM architecture.
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Currently, all Graham-Patten Edit Suite Audio
Mixers support the Serial II protocol at SMPTE
address 88A6 (hex). The D/ESAM 820 also supports the Serial 3 extensions
at the same
address.
Recent software upgrades have extended support
for the D/ESAM IV protocol to all of the
Graham-Patten D/ESAM mixers. The (chassis/panel) software versions that
contain D/ESAM IV
support are:
|
D/ESAM Model
|
Software Version
|
|
820
|
4.1 or higher
|
|
400
|
4.3 or higher
|
|
230
|
4.2B or higher
|
The default SMPTE address for D/ESAM IV is
87A6 (hex)
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SERIAL II
The Serial II protocol document is available
in MS Word 6.0 or Adobe Acrobat format. Click on
the appropriate hotlink to download the document. (Note: the .DOC file
is ZIP compressed to
speed up download time, and must be unzipped before use.)
Serial
II Protocol-Extended (rev 3) (DOC)
Serial
II Protocol-Extended (rev 3) 
SERIAL III
The Serial III extensions document is available
in Adobe PDF format.
Serial
III Protocol
D/ESAM IV
The D/ESAM IV document is available in
either MS Word 6.0 or Adobe PDF format. It is also
available as a Windows 3.1 Help (.HLP) file. (Note: the .DOC and .HLP
files are ZIP compressed
to speed up download time, and must be unzipped before use.)
D/ESAM
IV Audio Mixer Protocol (DOC)
D/ESAM
IV Audio Mixer Protocol (.HLP)
D/ESAM
IV Audio Mixer Protocol
A copy of the latest Adobe Acrobat reader
for Windows, Mac and UNIX platforms may be
obtained from Adobe
at no charge.
Printed versions of the protocol documents
may be obtained from Graham-Patten Systems Marketing
and Sales.
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