R&S NRPxxS Series User Manual page 163

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R&S NRPxxS(N)
The highest level is formed by the status byte register (STB) and the associated ser-
vice request enable (SRE) register.
The status byte register (STB) receives its information from:
●
Standard event status register (ESR)
●
Associated standard event status enable register (ESE)
●
SCPI-defined operation status register
●
Questionable status register, which contains detailed information on the device.
●
Device status register
11.3.2 Structure of a SCPI Status Register
Each SCPI register consists of five 16-bit registers that have different functions, see
Figure
tus is assigned a bit number which is the same for all five registers. Bit 15, the most-
significant bit, is set to 0 in all registers, thus preventing problems some controllers
have with the processing of unsigned integers.
Figure 11-2: Standard SCPI status register
CONDition status register part
The five parts of a SCPI register have different properties and functions:
The CONDition part is written into directly by the hardware or the sum bit of the next
lower register. Its contents reflect the current instrument status. This register part can
only be read, but not written into or cleared. Its contents are not affected by reading.
PTRansition / NTRansition status register part
The two transition register parts define which state transition of the CONDition part
(none, 0 to 1, 1 to 0 or both) is stored in the EVENt part.
User Manual 1177.5079.02 ─ 10
11-2. The individual bits are independent of each other, i.e. each hardware sta-
Remote Control Basics
Status Reporting System
163