Remote Control Basics
R&S
®
SMC100A
199
Operating Manual 1411.4060.32 ─ 04
(SRQ) is generated. The SRE can be set using the command
and read using the
command
*SRE?
.
Table 6-3: Meaning of the bits used in the status byte
Bit No.
Meaning
0...1
Not used
2
Error Queue not empty
The bit is set when an entry is made in the error queue. If this bit is enabled by the SRE, each
entry of the error queue generates a service request. Thus an error can be recognized and speci-
fied in greater detail by polling the error queue. The poll provides an informative error message.
This procedure is to be recommended since it considerably reduces the problems involved with
remote control.
3
Not used.
4
MAV bit (message available)
The bit is set if a message is available in the output buffer which can be read. This bit can be used
to enable data to be automatically read 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 indicates a serious error which can
be specified in greater detail by polling the event status register.
6
MSS bit (master status summary bit)
The 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
Not used.
6.5.3.2
IST Flag and Parallel Poll Enable Register (PPE)
As with the SRQ, the IST flag combines the entire status information in a single bit. It can
be read by means of a parallel poll (see
chapter 6.5.5.3, "Parallel Poll"
.
The parallel poll enable register (PPE) 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. The PPE can be set using commands
6.5.4 Event Status Register (ESR) and Event Status Enable Register (ESE)
The ESR is defined in IEEE 488.2. The event status register can be read out using com-
mand
on page 206. The ESE is the associated enable part. It can be set using the
on page 206 and read using the command
*ESE?
.
Status Reporting System
