Rohde & Schwarz R&S ZVA 8 - Responses to Queries; SCPI Parameters; Numeric Values

R&S
®
ZVA/ZVB/ZVT Remote Control: Introduction
1145.1084.12 5.11 E-1
CALL IBWRT(device%, "TRIG:SOUR EXT; TIM 0.1")
However, a new command line always begins with the complete path.
Example:
CALL IBWRT(device%, "TRIG:SOUR EXT ")
CALL IBWRT(device%, "TRIG:THR LOW ")
Responses to Queries
A query is defined for each setting command unless explicitly specified otherwise. It is formed by
adding a question mark to the associated setting command. According to SCPI, the responses to
queries are partly subject to stricter rules than in standard IEEE 488.2.
1. The requested parameter is transmitted without header.
Example: TRIGger:SOURce? Response: IMM
2. Maximum values, minimum values and all further quantities which are requested via a special text
parameter are returned as numerical values.
Example: SENSe:FREQuency:STOP? MAX Response: 8000000000
3. Numerical values are output without their unit. The default unit for each command is reported in the
SCPI command description.
Example: SENSe:FREQuency:STOP? MAX Response: 8000000000 for 8 GHz
4. Boolean values are returned as 0 (for OFF) and 1 (for ON).
Example: SWEep:TIME:AUTO? Response: 1
5. Text (character data) is returned in short form (see also next section).
Example: TRIGger:SOURce? Response: IMM
SCPI Parameters
Most commands require a parameter to be specified. The parameters must be separated from the
header by a "white space". Permissible parameters are numerical values, Boolean parameters, text,
character strings and block data. The type of parameter required for the respective command and the
permissible range of values are specified in the command description.
Numeric Values
Numeric values can be entered in any form, i.e. with sign, decimal point and exponent. Values
exceeding the resolution of the instrument are rounded up or down. The mantissa may comprise up to
255 characters, the values must be in the value range –9.9E37 to 9.9E37. The exponent is introduced
by an "E" or "e". Entry of the exponent alone is not allowed. In the case of physical quantities, the unit
can be entered. Permissible unit prefixes are G (giga), MA (mega), MOHM and MHZ are also
permissible), K (kilo), M (milli), U (micro) and N (nano). If the unit is missing, the default unit is used.
Example:
SOUR:RFG:FREQ 1.5GHz is equivalent to
SOUR:RFG:FREQ 1.5E9
Special numeric values
The texts MINimum, MAXimum, DEFault, UP and DOWN are interpreted as special numeric values. A
query returns the associated numerical value.