Remote Control Basics
R&S
®
NRX
457
User Manual 1178.5566.02 ─ 07
DEFault
denotes a preset value which has been stored in the non-variable mem-
ory. This value conforms to the default setting, as it is called by the *RST com-
mand.
●
UP/DOWN
UP
,
DOWN
increases or reduces the numeric value by one step. The step width can
be specified via an allocated step command for each parameter which can be set
via UP, DOWN.
●
INF/NINF
INFinity
,
Negative INFinity (NINF)
represent the numeric values 9.9E37
or -9.9E37, respectively.
INF
and
NINF
are only sent as instrument responses.
●
NAN
Not a number (NAN) represents the value 9.91E37. NAN is only sent as an instru-
ment response. This value is not defined. Possible causes are the division by zero,
the subtraction of infinite from infinite and the representation of missing values.
Boolean parameters
Boolean parameters represent two states. The "ON" state (logically true) is represen-
ted by "ON" or a numeric value 1. The "OFF" state (logically untrue) is represented by
"OFF" or the numeric value 0. The numeric values are provided as the response for a
query.
Example:
Setting command:
SENSe:AVERage:COUNt:AUTO ON
Query:
SENSe:AVERage:COUNt:AUTO?
Response:
1
Text parameters
Text parameters observe the syntactic rules for mnemonics, i.e. they can be entered
using a short or long form. Like any parameter, they have to be separated from the
header by a white space. For a query, the short form of the text is provided.
Example:
Setting command:
TRIGger:SLOPe POSitive
Query:
TRIG:SLOP?
Response:
POS
Character strings
Enter strings always in quotation marks (' or ").
Example:
Setting command:
SENSe:FUNCtion "POWer:AVG"
Query:
SENS:FUNC?
Response:
"POWer:AVG"
SCPI Command Structure
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