Status Reporting System R&S FSL
1300.2519.12 5.26 E-11
The parallel poll method is mainly used to find out quickly which one of the instruments connected to the
controller has sent a service request. To this effect, SRE and PPE must be set to the same value.
Query by Means of Commands
Each part of any status register can be read by means of queries. The individual commands are listed in
t
he description of the STATus Subsystem. The returned value is always a number that represents the
bit pattern of the queried register. This number is evaluated by the controller program.
Queries are usually used after an SRQ in order to obtain more detailed information on the cause of the
SRQ.
Error Queue Query
Each error state in the instrument leads to an entry in the error queue. The entries of the error queue
are detailed plain–text error messages that can be displayed via manual operation using the setup menu
or queried via remote control using the command SYSTem:ERRor?. Each call of SYSTem:ERRor?
provides one
entry from the error queue. If no error messages are stored there any more, the instrument
responds with 0, "No error".
The error queue should be queried after every SRQ 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 regularly since faulty commands from the controller to the
instrument are recorded there as well.
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