R&S ZVB - Contents of the Status Registers

R&S
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ZVA / R&S
®
ZVB / R&S
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ZVT Remote Control
Status Reporting System
Operating Manual 1145.1084.12 – 30 598
and contain detailed information on the instrument.
 IST, PPE The IST flag ("Individual STatus"), like the SRQ, combines the entire instrument status
in a single bit. The PPE is associated to the IST flag. It fulfills an analogous function for the IST
flag as the SRE does for the service request.
 Output buffer contains the messages the instrument returns to the controller. It is not part of the
status reporting system but determines the value of the MAV bit in the STB and thus is
represented in the overview.
The sum bit is obtained from the EVENt and ENABle part for each register. The result is then entered into
a bit of the CONDition part of the higher-order register.
The instrument automatically generates the sum bit for each register. Thus an event can lead to a service
request throughout all levels of the hierarchy.
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.
 The STATus:QUEStionable:INTegrity register monitors hardware failures of the analyzer.
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 EVENt 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.