Remote Control
R&S
®
ZNC
354
User Manual 1173.9557.02 ─ 13
is generated. Bit 6 of the SRE is ignored, because it corresponds to the summary bit
of the STB.
The bits in the STB are defined as follows:
Bit No.
Meaning
2
Error Queue not empty
If this bit is enabled by the SRE, each entry of the error queue generates a
(SRQ). Thus an error can be recognized and further pinned down by polling the
error queue. The poll provides an informative error message.
3
QUEStionable status summary bit
This bit is set if an EVENt bit is set in the
register and the associated
ENABle bit is set to 1.
The bit indicates a questionable instrument status, which can be further pinned down by
polling the QUEStionable register.
4
MAV bit
(message available)
This bit is set if a message is available and can be read from the output buffer.
This bit can be used to automatically transfer data from the instrument to the controller.
5
ESB bit
Sum bit of the event status register. It is set if one of the bits in the event status register is
set and enabled in the event status enable register.
Setting of this bit implies an error or an event which can be further pinned down by polling
the event status register.
6
MSS bit
(master status summary bit)
This bit is set if the instrument triggers a service request. This is the case if one of the other
bits of this registers is set together with its mask bit in the service request enable register
SRE.
7
OPERation status register summary bit
This bit is set if an EVENt bit is set in the OPERation-Status register and the associated
ENABle bit is set to 1.
The bit indicates that the instrument is currently performing an action. The type of action can
be determined by polling the
register.
Related common commands
The STB is read out using the command
*STB?
or a
.
The SRE can be set using command
*SRE
and read using
*SRE?
.
5.5.3.2
IST Flag and PPE
(SRQ), the IST flag combines the entire status infor-
mation in a single bit. It can be queried by means of a
The Parallel Poll Enable (PPE) register determines which bits of the STB contribute to
the IST flag. The bits of the STB are ANDed with the corresponding bits of the PPE, with
bit 6 being used as well in contrast to the SRE. The IST flag results from the ORing of all
results.
Status Reporting System