Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
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Controlling SoundStructure Parameters
The SoundStructure command and control functions allow an external con-
troller to set, query, and monitor parameters of one or more linked
SoundStructure devices. There are three types of parameters that can be
controlled:
• system parameters,
• virtual channel parameters, and
• matrix parameters.
System Parameters
System parameters are global and apply to a collection of OBAM-linked
SoundStructure devices. A device-specific system parameter affects a param-
eter on a single SoundStructure device. Examples of device specific system
parameters include firmware version and RS-232 baud rate.
Device-specific system parameters are addressed by an integer index that indi-
cates the device ID of the SoundStructure device that is to be controlled. The
device ID is created automatically when multiple SoundStructure devices are
linked together through the OBAM interface. All stand-alone SoundStructure
devices will have a device ID equal to 1. In a multi-device system, the device
that has no OBAM in connection is device 1, the device connected to that
device is device 2, and so on until the last device. Up to 8 devices may be con-
nected over OBAM.
Virtual Channel Parameters
Virtual channel parameters are defined for a given virtual channel. Examples
of virtual channel parameters include gain, AEC enable, and telephone dial-
ing. These parameters are addressed by the virtual channel name that
identifies the virtual channel to be controlled.
Matrix Parameters
Matrix parameters are defined at crosspoints of the SoundStructure matrix
mixer. Since a matrix crosspoint is defined by an input and an output, matrix
parameters are addressed by two virtual channel names that identify the input
and output virtual channels that define the crosspoint to be controlled.
Parameters can have access modes of read/write, read-only, or write-only. Some
parameters can also support user-definable minimum and maximum limits
such as volume control commands.
All parameter control commands operate on a specific type of parameter. The
parameter types supported by the SoundStructure control protocol are:
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