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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
A - 12
Floating-Point Arguments
Floating-point arguments represent a floating-point value. They are
represented using a string of digits (0030-0039), an optional decimal point
symbol (002E), an optional E (0045) or e (0065) for indicating an exponent, and
optional plus symbols (002B) or minus symbols (002D) for indicating the sign
of the mantissa or exponent.
Examples of valid floating-point arguments are 0.618, -4.8, 2, +3.14, 6.022e23,
6.626E-34, and -1.759e11. Floating-point arguments must be less than or equal
to 32 bytes in length.
System-Defined Text Arguments
Text arguments that are defined by the command set consists only of digits
(0030-0039), lower-case characters (0061-007A), and the underscore character
(005F). The underscore character is used when it would make long arguments
more readable. Examples of valid system-defined text arguments are
cr_mic_in and agc_rate. System-defined text arguments must be less than or
equal to 32 bytes in length.
User-Defined Text Arguments
Text arguments and data that are user-defined (for example, virtual channel
labels) support all UTF-8 symbols except the control symbols (0000-001F). The
full range of UTF-8 symbols is supported to allow user-definable labels in
other languages. The control symbols are not supported because they are
typically unprintable. In particular, the line feed (000A) and carriage return
(000D) symbols are not allowed for two reasons: first, those symbols are used
as command terminating characters; and second, the command set does not
support the concept of multi-line text arguments.
User-defined text arguments are delimited by a quotation mark symbol (0022)
at the start and end of the string. Quotation mark symbols appearing within
the text argument can be escaped by a preceding backslash symbol (005C).
Literal backslash symbols appearing within the text argument are escaped by
a preceding backslash symbol.
Examples of valid user-defined test arguments are “Table Mics”, “Mic 1\\3”,
and “\”Program\” Audio”.
User-defined text arguments must be less than or equal to 256 bytes in length.
Note that this may be less than 256 symbols, since most of the UTF-8 symbols
are multi-byte. The quotation mark delimiters and escape characters are
included in the 256 byte limit.
Acknowledgements
Control commands generate acknowledgements that are similar to the
command format. The acknowledgements are typically prefixed with the
keyword val to indicate the value returned from the command.