Remote Control - Commands R&S NRP
1144.1400.12 6.70 E-3
The status reporting system stores all information about the current operating status of the device and
errors that occur. The information is stored in the status registers and the error queue. The contents of
the status registers and error queue can be queried via the IEC/IEEE bus. The information is
hierarchically structured. The highest level is formed by the Status Byte Register (STB) defined by IEEE
488.2 and the associated Service Request Enable (SRE) register. The STB receives its information
from the Standard Event Status Register (ESR) also defined by IEEE 488.2 and the associated
Standard Event Status Enable (ESE) Register, as well as from the SCPI-defined Operation Status
Register and the Questionable Status Register, which contain detailed information on the device, and
from the Device Status Register.
The status reporting system also includes the IST flag (I
ndividual STatus) and the Parallel Poll Enable
Register (PPE) assigned to it. The IST flag, like the SRQ, combines the complete device status in a
single bit. The PPE has the same function for the IST flag as the SRE has for the service request.
The output buffer (output queue) contains the messages the device returns to the controller. It is not
part of the status reporting system but since it determines the value of the MAV bit in the STB it is also
shown in Fig. 6-11.
Structure of SCPI Status Register
Each SCPI register consists of five 16-bit registers which have different functions (Æ Fig. 6-10). The
individual bits are independent of each other, i.e. each hardware status is assigned a bit number which
is the same for all five registers. For instance, bit 4 of the operation status register is assigned to the
hardware status "Measurement" in all five registers. Bit 15 (the most-significant bit) is set to zero in all
registers. This prevents problems some controllers have with the processing of unsigned integers.
12
30131415 12
PTRansition register
&&&&
+
Summary
bit of SCPI register,
written into a bit of the STB or
into the CONDition bit of a
superordinate register.
Logic OR
of all bits
Logic AND of
EVENT and ENABle bits
&&&&&&&&&&&&
CONDition register
12
30131415 12
NTRansition register
1230131415 12
EVENt register
12
30131415 12
ENABle register
12
30131415 12
States, events or
summary bits of other registers
+
Simplified
diagram
Fig. 6-10: Standard SCPI status register
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