The Status Byte Register (SBR). Records whether output is available in the Output
Queue, whether the instrument requests service, and whether the SESR has
recorded any events.
Use a Serial Poll or the *STB? query to read the contents of the SBR. The bits in
the SBR are set and cleared depending on the contents of the SESR, the Event
Status Enable Register (ESER), and the Output Queue. When you use a Serial
Poll to obtain the SBR, bit 6 is the RQS bit. When you use the *STB? query to
obtain the SBR, bit 6 is the MSS bit. Reading the SBR does not clear the bits.
Figure 4: The Status Byte Register (SBR)
Table 29: SBR bit functions
Bit Function
7 (MSB) ------------ Not used.
6 RQS Request Service. Obtained from
a serial poll. Shows that the
instrument requests service
from the GPIB controller.
6 MSS Master Status Summary.
Obtained from *STB? query.
Summarizes the ESB and MAV
bits in the SBR.
5 ESB Event Status Bit. Shows that
status is enabled and present in
the SESR.
4 MAV Message Available. Shows that
output is available in the Output
Queue.
3 ------------ Not used.
2 ------------ Not used.
1–0 ------------ Not used.
Status and Events
TBS2000 Series Programmer 277
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