Network and remote operation
R&S
®
NRPM
99
Mannual 1425.8663.02 ─ 08
ENABle
bit = 1: if the associated
EVENt
bit is "1", the sum bit is set to "1" as well.
This part can be written into and read by the user as required. Its contents are not
affected by reading.
Sum bit
The sum bit is obtained from the
EVENt
and
ENABle
part for each register. The
result is then entered into a bit of the
CONDition
part of the higher-order register.
The instrument automatically generates the sum bit for each register. Thus an
event can lead to a service request throughout all levels of the hierarchy.
9.2.3
Status byte (STB) and service request enable register
(SRE)
The STB is already defined in IEEE 488.2. It gives a rough overview of the sensor
module status, collecting information from the lower-level registers. It is compara-
ble with the CONDition register of an 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 is read by the query *STB? or a serial poll. The SRE is associ-
ated with the STB. The function of the SRE corresponds to that of the ENABle
register of the SCPI registers. Each bit of the STB is assigned a bit in the SRE.
Bit 6 of the SRE is ignored. If a bit is set in the SRE and the associated bit in the
STB changes from 0 to 1, a service request (SRQ) is generated on the IEC/IEEE
bus, which triggers an interrupt in the controller configured for this purpose, and
can be further processed by the controller.
The SRE can be set by the command
*SRE
and read by the query
*SRE?
.
Table 9-3: Meaning of bits used in the status byte
Bit No.
Meaning
0
Not used
1
Device status register summary bit
Depending on the configuration of the sensor modules status register, this bit is
set when a sensor module is connected or disconnected or when an error has
occurred in a sensor module.
See
Chapter 9.2.5, "Device status register"
Status reporting system
