Rohde & Schwarz SMC100A, Operating Manual

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Remote Control Basics
R&S
®
SMC100A
203 Operating Manual 1411.4060.32 ─ 04
Table 6-5: Resetting the status reporting system
Event Switching on supply
voltage
Power-On-Status-
Clear
DCL, SDC
(Device
Clear,
Selected
Device
Clear)
*RST or
SYS-
Tem:PRE-
Set STA-
Tus:PRE-
Set *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 TERMINATOR>
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 contrast,
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).
Reacting to malfunctions
The service request is the only possibility for the instrument to become active on its own.
Each controller program should instruct the instrument to initiate a service request in case
of malfunction. The program should react appropriately to the service request.
Error queues
The error queue should be queried after every service request in the controller program
as the entries describe the cause of an error more precisely than the status registers.
Especially in the test phase of a controller program the error queue should be queried
General Programming Recommendations