HP 5961-0509 manual Parameterized Escape Sequences, Parameterized Character a character from

Parameterized Escape Sequences

Parameterized escape sequences have the following form:

?X y z1 # z2 # z3 ... # Zn[data]

where y, #, zi (z1, z2, z3...) and [data] may be optional, depending on the command.

X	Parameterized Character - A character from the
	ASCII table within the range 33-47 decimal
	(“!” through “ /”) indicating that the escape sequence is
	parameterized.
y	Group Character - A character from the ASCII table
	within the range 96-126 decimal (“ ‘ ” through “ ~ ”) that
	specifies the group type of control being performed.
#	Value Field - A group of characters specifying a
	numeric value. The numeric value is represented as an
	ASCII string of characters within the range 48-57
	decimal (“0” through “9”) that may be preceded by a “+”
	or “—” sign and may contain a fractional portion
	indicated by the digits after a decimal point (“ . ”).
	Numeric value fields are within the range -32767 to
	65535. If an escape sequence requires a value field
	and a value is not specified, a value of zero is
	assumed.
zi	Parameter Character - Any character from the ASCII
	table within the range 96-126 decimal (“ ‘ ” through
	“ ~ ”). This character specifies the parameter to which
	the previous value field applies. This character is used
	when combining escape sequences.
Zn	Termination Character - Any character from the
	ASCII table within the range 64-94 decimal
	(“ @ ” through “ ^ ” ). This character specifies the
	parameter to which the previous value field applies.
	This character terminates the escape sequence.
[data]	Binary Data is eight-bit data (for example, graphics
	data, downloaded fonts, etc.). The number of bytes of
	binary data is specified by the value field of the escape
	sequence. Binary data immediately follows the
	terminating character of the escape sequence.

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