Status Reporting System - R&S EB200 Manual

EB200 Manual Remote control

4.7 Status reporting system

The status reporting system (see Fig. 4-5) stores all the information on the present operating state of
the device, eg that the device presently carries out a SWEeping, and on errors which have occurred.
This information is stored in the status registers and in the error queue. For each remote client there is
a separate status reporting system and access to all registers of the error queue.
The information is of hierarchical structure. The register status byte (STB) defined in IEEE 488.2 and
its associated mask register service request enable (SRE) form the uppermost level. The STB receives
its information from the standard event status register (ESR) which is also defined in IEEE 488.2 with
the associated mask register standard event status enable (ESE) and registers STATus:OPERation
and STATus:QUEStionable which are defined by SCPI, the registers STATus:TRACe and
STATus:EXTension not specified by SCPI as well as the two queues error queue and message
queue.
The IST flag ("Individual STatus") and the parallel poll enable register (PPE) allocated to it are also part
of the status reporting system. The IST flag, like the SRQ, combines the entire device status in a single
bit. The PPE fulfils a function for the IST flag as the SRE does for the service request.
The message queue contains the messages the device sends back to the controller. It is not part of the
status reporting system but determines the value of the MAV bit in STB and is thus shown in Fig. 4-5.
4052.2000.02 4.127 E-7