Tektronix OA 5000 Series, User Manual

Page: 83 / 136

Status and Events
Programming
3 ---36
Table 3-8: SESR Bit Functions
Bit Function
7 (MSB) PON (Power On). Shows that the OA 5000 was powered on.
6 URQ (User Request). Shows that the Remote button was
pressed.
5 CME (Command Error). Shows that an error occurred while
the OA 5000 was parsing a command or query. Command
error messages are listed in Table 3-11 on page 3 --- 41.
4 EXE (Execution Error). Shows that an error occurred while
the OA 5000 was executing a command or query. Execution
error messages are listed in Table 3-12 on page 3 --- 42.
3 DDE (Device Error). Shows that a device error occurred. De-
vice error messages are listed in Table 3-13 on page 3 --- 43.
2 QYE (Query Error). Shows that either an attempt was made
to read the Output Queue when no data was present or
pending, or that data in the Output Queue was lost.
1 RQC (Request Control). Not used.
0 (LSB) OPC (Operation Complete). Shows that the operation is com-
plete. This bit is set by the
*OPC
command.
The Status Byte Register (SBR)
— shown in Figure 3-7, records wheth-
er output is available in the Output Queue, whether the OA 5000 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. Refer
to Table 3-9. 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.)
—
RQS
ESB MAV — — — —
MSS
7
6
5 4 3 2 1 0
6
Figure 3-7: The Status Byte Register (SBR)
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