Agilent Technologies E4406A VSA manual Special Characters in Commands, Parameters indicates

		Programming Fundamentals
		SCPI Language Basics
Special Characters in Commands
Special	Meaning	Example
Character
	A vertical stroke between	Command:
	parameters indicates	TRIGger:SOURce
	alternative choices. The	EXTernalINTernalLINE
	effect of the command is	The choices are external,
	different depending on
		internal, and line.
	which parameter is selected.
		Ex: TRIG:SOURCE INT
		is one possible command
		choice.
	A vertical stroke between	Command:
	keywords indicates	SENSe:BANDwidthBWIDth:
	identical effects exist for	OFFSet
	both keywords. The	Two identical commands are:
	command functions the
		Ex1: SENSE:BWIDTH:OFFSET
	same for either keyword.
		Ex2: SENSE:BAND:OFFSET
	Only one of these keywords
	is used at a time.
[ ]	keywords in square	Command:
	brackets are optional	[SENSe:]BANDwidth[:RESolu
	when composing the	tion]:AUTO
	command. These implied	The following commands are
	keywords will be executed
		all valid and have identical
	even if they are omitted.
		effects:
		Ex1: bandwidth:auto
		Ex2: band:resolution:auto
		Ex3: sense:bandwidth:auto
< >	Angle brackets around a	Command:
	word, or words, indicates	SENS:FREQ <freq>
	they are not to be used	In this command example the
	literally in the command.
		word <freq> should be
	They represent the needed
		replaced by an actual
	item.
		frequency.
		Ex: SENS:FREQ 9.7MHz.
{ }	Parameters in braces can	Command:
	optionally be used in the	MEASure:BW <freq>{,level}
	command either not at all,	A valid command is:
	once, or several times.
		meas:BW 6 MHz, 3dB, 60dB

Chapter 2 61