Instrument Model and Command Processing R&S FSL
1300.2519.12 5.12 E-11
Data base and instrument hardware
Here the expression "instrument hardware" denotes the part of the instrument fulfilling the actual
i
nstrument function – signal generation, measurement etc. The controller is not included. The term
"data base" denotes a database that manages all the parameters and associated settings required for
setting the instrument hardware.
Setting commands lead to an alteration in the data set. The data set management enters the new
values (e.g. frequency) into the data set, however, only passes them on to the hardware when
requested by the command recognition. This only takes place at the end of a command line.
The data are checked for compatibility with the current instrument settings before they are transmitted to
the instrument hardware. If the execution is not possible, an "execution error" is signaled to the status
reporting system. The corresponding settings are discarded.
Before passing on the data to the hardware, the settling bit in the STATus:OPERation register is set
(refer to section "STATus:OPERation Register"). The hardware executes the settings and resets the bit
again as soon as the new state has settled. This fact can be used to synchronize command servicing.
Queries induce the data set management to send the desired data to the output unit.
Status reporting system
For detailed information refer to section "Status Reporting System".
Output unit
The output unit collects the information requested by the controller, which it receives from the data base
management. It processes it according to the SCPI rules and makes it available in the output buffer.
If the instrument is addressed as a talker without the output buffer containing data or awaiting data from
the data base management, the output unit sends error message "Query UNTERMINATED" to the
status reporting system. No data are sent on the GPIB or via the Ethernet, the controller waits until it has
reached its time limit. This behavior is specified by SCPI.
To Next Page
Loading...
