R&S ESU Series, Operating Manual

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R&S ESU Remote Control – Basics
Structure and Syntax of the Device Messages
5.12 Operating Manual 1302.6163.12 - 03
SENSe:FREQuency:STOP? MAXimum
This query requests the maximal value for the stop frequency. Response: 3.5E9
Numeric suffix
If a device features several functions or features of the same kind, e.g. inputs, the
desired function can be selected by a suffix added to the command. Entries without
suffix are interpreted like entries with the suffix 1.
Example:
SYSTem:COMMunicate:SERial2:BAUD 9600
This command sets the baudrate of a second serial interface.
5.6.3 Structure of a Command Line
A command line may consist of one or several commands. It is terminated by a
<New Line>, a <New Line> with EOI or an EOI together with the last data byte. The
IEC/IEEE driver of the controller usually produces automatically an EOI together
with the last data byte.
Several commands in a command line are separated by a semicolon ";". If the next
command belongs to a different command system, the semicolon is followed by a
colon.
Example:
CALL IBWRT(analyzer%,"SENSe:FREQuency:CENTer 100MHz;:INPut:
ATTenuation 10")
This command line contains two commands. The first one is part of the SENSe
command system and is used to determine the center frequency of the
instrument. The second one is part of the INPut command system and sets the
input signal attenuation.
If the successive commands belong to the same system, having one or several lev-
els in common, the command line can be abbreviated. For that purpose, the second
command after the semicolon starts with the level that lies below the common levels
(see also
Fig. 5.40 ). The colon following the semicolon must be omitted in this case.
Example:
CALL IBWRT(analyzer%, "SENSe:FREQuency:STARt 1E6;:SENSe:
FREQuency:STOP 1E9")
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
SENSe command system, subsystem FREQuency, i.e. they have two common
levels.
When abbreviating the command line, the second command begins with the level
below
SENSe:FREQuency
. The colon after the semicolon is omitted.
The abbreviated form of the command line reads as follows:
CALL IBWRT(analyzer%, "SENSe:FREQuency:STARt 1E6;STOP 1E9")
However, a new command line always begins with the complete path.
Example:
CALL IBWRT(analyzer, "SENSe:FREQuency:STARt 1E6")
CALL IBWRT(analyzer%, "SENSe:FREQuency:STOP 1E9")