Remote Commands
R&S
®
Cable Rider ZPH
240
User Manual 1321.0950.02 ─ 03
Figure 11-7: Overview of the status registers
11.6.8.3
Status Byte (STB) & Service Request Enable Register (SRE)
The STB is already defined in IEEE 488.2. It provides a rough overview of the instru-
ment status by collecting the pieces of information of the lower registers. It can thus be
compared with the CONDition part of an SCPI register and assumes the highest level
within the SCPI hierarchy. A special feature is that bit six acts as the sum bit of the
remaining bits of the status byte.
The STATUS BYTE is read using the command
*STB?
or a serial poll.
The STB is linked to the SRE. The latter corresponds to the ENABle part of the SCPI
registers in its function. 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, which triggers an interrupt in the
controller if this is appropriately configured and can be further processed there. The
SRE can be set using the command "*SRE" and read using the command
*SRE?
Remote Control - Commands
