R&S 1424.6721.02, Руководство пользователя

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Remote Control Basics
R&S
®
NRP18S-xx
139 User Manual 1178.3686.02 ─ 05
Table 10-4: 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 10.3.5, "Device Status Register" , on page 140.
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 10.3.6, "Questionable Status Register" , on page 141.
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 10.3.7, "Standard Event Status and Enable Register
(ESR, ESE)"
, on page 144.
6 MSS
Master status summary
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).
7 Operation status register sum-
mary 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 Register" , on page 145.
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
.
Status Reporting System