R&S ZVL
Remote Control
Status Reporting System
Operating Manual 1303.6580.32-05
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Status Registers
Contents of the Status Registers
The individual status registers are used to report different classes of instrument states or errors. The
following status registers belong to the general model described in IEEE 488.2:
The STatus Byte (STB) gives a rough overview of the instrument status.
The IST flag combines the entire status information into a single bit that can be queried in a
parallel poll.
The Event Status Register (ESR) indicates general instrument states.
The status registers below belong to the device-dependent SCPI register model:
The STATus:OPERation register contains conditions which are part of the instrument's normal
operation.
The STATus:QUEStionable register indicates whether the data currently being acquired is of
questionable quality.
The STATus:QUEStionable:LIMit<1|2> register indicates the result of the limit check.
STB and SRE
The STatus Byte (STB) provides a rough overview of the instrument status by collecting the pieces of
information of the lower registers. The STB represents the highest level within the SCPI hierarchy. A
special feature is that bit 6 acts as the summary bit of the remaining bits of the status byte.
SRE and Service Request
The STatus Byte (STB) is linked to the Service Request Enable (SRE) register on a bit-by-bit basis.
The STB corresponds to the CONDition part of an SCPI register, indicating the current instrument
state.
The SRE corresponds to the ENABle part of an SCPI register.If a bit is set in the SRE and the
associated bit in the STB changes from 0 to 1, a Service Request (SRQ) is generated on the
GPIB bus.
Bit 6 of the SRE is ignored, because it corresponds to the summary bit of the STB.
Related common commands
The STB is read out using the command
*STB?
or a serial poll.
The SRE can be set using command
*SRE
and read using
*SRE?
.
The bits in the STB are defined as follows:
Bit
No.
Meaning
