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Agilent E1441A SCPI Command Reference 71
Chapter 3
Implied
Commands
Implied commands are those which appear in square brackets ([]) in the command
syntax. (Note that the brackets are not part of the command and are not sent to the
instrument.) Suppose you send a second level command but do not send the
preceding implied command. In this case, the instrument assumes you intend to use
the implied command and it responds as if you had sent it. Examine the partial
SOURce subsystem shown below:
[SOURce:]
FUNCtion
[:SHAPe] "<shape>"(e.g., <shape> = SQUare)
[:SHAPe]?
FREQuency <frequency> | MINimum | MAXimum
FREQuency? [ MINimum|MAXimum ]
The root command SOURce: is an implied command. For example, to set the
function generator's function to a square wave, you can send either of the following
command statements:
SOUR:FUNC SQU or
FUNC SQU
Parameters Parameter Types. The following table contains explanations and examples of
parameter types you might see later in this chapter.
Optional Parameters. Parameters shown within square brackets ([]) are optional
parameters. (Note that the brackets are not part of the command and are not sent to
the instrument.) If you do not specify a value for an optional parameter, the
instrument chooses a default value. For example, consider the AM:DEPTh? [MIN |
MAX] command. If you send the command without specifying a MINimum or
MAXimum parameter, the present AM:DEPTh value is returned. If you send the
MIN parameter, the command returns the minimum AM modulation depth available.
If you send the MAX parameter, the command returns the maximum AM
modulation depth available. Be sure to place a space between the command and the
parameter.
Linking
Commands
Linking IEEE 488.2 Common Commands with SCPI Commands. Use a
semicolon between the commands. For example:
*RST;OUTP:LOAD INF or TRIG:SOUR BUS;*TRG
Linking Multiple SCPI Commands. Use both a semicolon and a colon between
the commands. For example:
OUTP:LOAD 50;:APPL:RAMP
Parameter Type Explanations and Examples
Numeric Accepts all commonly used decimal representations of number
including optional signs, decimal points, and scientific notation.
123, 123E2, -123, -1.23E2, .123, 1.23E-2, 1.23000E-01.
Special cases include MINimum, MAXimum, and DEFault.
Boolean Represents a single binary condition that is either true or false.
ON, OFF, 1, 0
Discrete Selects from a finite number of values. These parameters
use mnemonics to represent each valid setting.
An example is the TRIGger:SOURce <source> command where
source can be BUS, EXT, or IMM.