Status and Events
3−4
TDS200/1000/2000 Series Oscilloscope Programmer Manual
Table 3−2: SBR bit functions
Bit Function
7 (MSB) Not used.
6 RQS (Request Service), obtained from a serial poll. Shows that
the oscilloscope requests service from the GPIB controller.
6 MSS (Master Status Summary), obtained from *STB?.
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.
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 Status Enable Register (DESER). The DESER, shown
in Figure 3-3, 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.
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