Remote Control Basics
R&S
®
SMB100A
277
Operating Manual 1407.0806.32 ─ 21
larly since faulty commands from the controller to the instrument are recorded there as
well.
6.5.8 Reset Values of the Status Reporting System
The following table contains the different commands and events causing the status
reporting system to be reset. None of the commands, except of
*RST
and
SYSTem:PRESet
affect the functional instrument settings. In particular,
DCL
does not
change the instrument settings.
Table 6-7: Resetting the status reporting system
Event
Switching on supply
voltage
Power-On-Status-
Clear
DCL,
SDC
(Device
Clear,
Selected
Device
Clear)
*RST
or
SYSTem:
PRESet
STATus:
PRESet
*CLS
Effect
0
1
Clear STB, ESR
-
Yes
-
-
-
Yes
Clear SRE, ESE
-
Yes
-
-
-
-
Clear PPE
-
Yes
-
-
-
-
Clear error queue
Yes
Yes
-
-
-
Yes
Clear output buffer
Yes
Yes
Yes
1)
1)
1)
Clear command processing
and input buffer
Yes
Yes
Yes
-
-
-
1) The first command in a command line that immediately follows a <PROGRAM MESSAGE TERMINA-
TOR> clears the output buffer.
6.6 General Programming Recommendations
Initial instrument status before changing settings
Manual operation is designed for maximum possible operating convenience. In con-
trast, the priority of remote control is the "predictability" of the instrument status. Thus,
when a command attempts to define incompatible settings, the command is ignored
and the instrument status remains unchanged, i.e. other settings are not automatically
adapted. Therefore, control programs should always define an initial instrument status
(e.g. using the *RST command) and then implement the required settings.
Command sequence
As a general rule, send commands and queries in different program messages. Other-
wise, the result of the query may vary depending on which operation is performed first
(see also Preventing Overlapping Execution).
General Programming Recommendations
