R&S ZVL
Remote Control
Messages
Operating Manual 1303.6580.32-05
324
This command line is represented in its full length and contains two commands separated from each other
by the semicolon. Both commands are part of the
TRIGger
command system, i.e. they have one level in
common.
When abbreviating the command line, the second command begins with the level below
TRIG
. The colon
after the semicolon is omitted. The abbreviated form of the command line reads as follows:
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.
