R&S EM510, Manual

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Remote Control via LAN EM510
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Some keywords occur at several levels within one command system. Their
effect depends on the structure of the command, that is to say, at which
position in the header of a command they are inserted.
Example:
OUTPut:OUTPut:SQUelch:STATe ON
This command contains the keyword
STATe
at the third
command level. It defines the state of the
SQUelch
function.
OUTPut:FILTer:LPAS:STATe OFF
This command contains the keyword STATe at the fourth
command level. It defines the state of the AF filter.
Optional keywords: Some command systems permit certain keywords to be optionally inserted
into the header or omitted. These keywords are marked by square
brackets in the description. The full command length must be recognized
by the device for reasons of compatibility with the SCPI standard. Some
commands are considerably shortened by these optional keywords.
Example:
[SENSe]:FREQuency[:CW]: STEP [:INCRement]
25 kHz
This command sets the stepwidth for frequency UP-DOWN to
25 kHz. The following command has the same effect:
FREQuency:STEP 25 kHz
Note:
An optional keyword must not be omitted if its effect is specified
in detail by a numeric suffix.
Long and short form: The keywords can be of a long form or a short form. Either the short form
or the long form can be entered, other abbreviations are not permissible.
Example: Long form: STATus:QUEStionable:ENABle 1
Short form: STAT:QUES:ENAB 1