R&S NRP18S Series User Manual page 139

®
R&S NRP18S-xx
Table 10-4: Used status byte bits and their meaning
Bit
no.
1
2
3
4
5
6
7
10.3.4 IST Flag and Parallel Poll Enable Register (PPE)
Similar to the service request (SRQ), the IST flag combines the complete status infor-
mation in a single bit. It can be queried by a parallel poll or by *IST?.
The parallel poll enable register (PPE) determines which bits of the STB affect the IST
flag. The bits of the STB are ANDed with the corresponding bits of the PPE; bit 6 is
also used, in contrast to the service request enable register. The IST flag is obtained
by ORing all results together.
Set and read the parallel poll enable register using *PRE.
User Manual 1178.3686.02 ─ 05
Short description
Device status register summary
Error queue not empty
Questionable status register
summary
MAV
Message available
ESB
Standard event status register
summary
MSS
Master status summary
Operation status register sum-
mary
Bit is set if
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 10.3.5, "Device Status
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.
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 10.3.6, "Questionable Status
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.
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 10.3.7, "Standard Event Status and Enable Register
(ESR, ESE)", on page 144.
The sensor triggers a service request, which happens if one of
the other bits of this register is set together with its enable bit
in the service request enable register (SRE).
An EVENt bit is set in the operation status register and the
associated ENABLe bit is set to 1. A set bit denotes that an
action is being performed by the sensor. Information on the
type of action can be obtained by querying the operation sta-
tus register.
Chapter 10.3.8, "Operation Status
Remote Control Basics
Status Reporting System
Register", on page 140.
Register", on page 141.
Register", on page 145.
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