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Status and Events
OA 5000 Series User Manual
3 --- 37
Table 3 -9: SBR Bit Functions
Bit
Function
7 (MSB) Not used (always 0).
6 RQS (Request Service ), obtained from a serial poll. Shows
that the OA 5000 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 --- 0 Not used (always 0).
Enable Registers
The DESER, ESER, and SRER allow you to select which events are reported
to the Status Registers and the Event Queue. Each Enable Register acts as
a filter to a Status Register (the DESER also acts as a filter to the Event
Queue), and can prevent information from being recorded in the register or
queue.
Each bit in an Enable Register corresponds to a bit in the Status Register it
controls. In order for an event to be reported to its bit in the Status Register,
the corresponding bit in the Enable Register must be set to one. If the bit in
the Enable Register is set to zero, the event is not recorded.
The bits in the Enable Registers are set using various commands. The
Enable Registers and the commands used to set them are described below.
The Device Event Stat us Enable Register (DESER) — is shown in
Figure 3-8. This register controls which types of events are reported to the
SESR and the Event Queue. The bits in the DESER correspond to those in
the SESR, as described earlier.
Use the DESE command to enable and disable the bits in the DESER. Use
the DESE? query to read the DESER.
PON URQ CME EXE DDE QYE RQC OPC
76543210
Figure 3-8: The Device Event Status Enab le Register (DESER)