Rohde & Schwarz NRP T Series, User Manual

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Remote Control Basics
R&S
®
NRPxxT(N)
145 User Manual 1177.6023.02 ─ 08
with the
CONDition
register of a SCPI defined register and is at the highest level of
the SCPI hierarchy. Its special feature is that bit 6 acts as the summary bit of all other
bits of the status byte register.
The status byte register is read by
*STB?
or a serial poll. The service request enable
register is associated with the status byte register. The function of the service request
enable register corresponds to that of the
ENABle
register of the SCPI registers. Each
bit of the status byte register is assigned a bit in the service request enable register.
Bit
6 of the service request enable register is ignored. If a bit is set in the service
request enable register and the associated bit in the status byte register changes from
0 to 1, a service request (SRQ) is generated on the IEC/IEEE bus. This service request
triggers an interrupt in the controller configured for this purpose, and can be further
processed by the controller.
Set and read the service request enable register using
*SRE
.
See Figure 11-1 .
Table 11-4: Used status byte bits and their meaning
Bit
no. Short description Bit is set if
1 Device status register summary A sensor is connected or disconnected or when an error has
occurred in a sensor, depending on the configuration of the
sensor status register.
Chapter 11.3.5, "Device Status Register" , on page 146.
2 Error queue not empty The error queue has an entry. If this bit is enabled by the ser-
vice request enable register, each entry of the error queue
generates a service request. An error can thus be recognized
and specified in detail by querying the error queue. The query
yields a conclusive error message. This procedure is recom-
mended since it considerably reduces the problems of IEC/
IEEE-bus control.
3 Questionable status register
summary An
EVENt
bit is set in the
QUEStionable
status register and
the associated
ENABLe
bit is set to 1. A set bit denotes a ques-
tionable device status which can be specified in greater detail
by querying the questionable status register.
Chapter 11.3.6, "Questionable Status Register" , on page 147.
4 MAV
Message available
A readable message is in the output queue. This bit can be
used to automate reading of data from the sensor into the con-
troller.
5 ESB
Standard event status register
summary
One of the bits in the standard event status register is set and
enabled in the event status enable register. Setting this bit
denotes a serious error which can be specified in greater detail
by querying the standard event status register.
Chapter 11.3.7, "Standard Event Status and Enable Register
(ESR, ESE)"
, on page 150.
Status Reporting System