Programming instructions
Table Of Contents
- Contents
- Title Page
- Chapter 1 Introduction to Programming
- Chapter 2 Programming Getting Started
- Chapter 3 Programming over HP-IB
- Chapter 4 Programming over RS-232-C
- Chapter 5 Programming and Documentation Conventions
- Chapter 6 Status Reporting
- Figure 6-1. Status Reporting Overview Block Diagram
- Table 6-1. Status Reporting Bit Definition
- Status Reporting Data Structures
- Status Byte Register (SBR)
- Service Request Enable Register (SRER)
- Trigger Event Register (TRG)
- Standard Event Status Register (SESR)
- Standard Event Status Enable Register (SESER)
- User Event Register (UER)
- Local Event Register (LCL)
- Operation Status Register (OPR)
- Limit Test Event Register (LTER)
- Mask Test Event Register (MTER)
- Histogram Event Register (HER)
- Arm Event Register (ARM)
- Error Queue
- Output Queue
- Message Queue
- Key Queue
- Clearing Registers and Queues
- Figure 6-3. Status Reporting Decision Chart
- Chapter 7 Installing and Using the Programmer's Reference
- Chapter 8 Programmer’s Quick Reference
- Warranty
- Index
Error Queue
As errors are detected, they are placed in an error queue. This queue is first
in, first out. If the error queue overflows, the last error in the queue is
replaced with error 350, “Queue overflow.” Any time the queue overflows,
the least recent errors remain in the queue, and the most recent error is
discarded. The length of the oscilloscope’s error queue is 30 (29 positions for
the error messages, and 1 position for the “Queue overflow” message).
The error queue is read with the SYSTEM:ERROR? query. Executing this
query reads and removes the oldest error from the head of the queue, which
opens a position at the tail of the queue for a new error. When all the errors
have been read from the queue, subsequent error queries return 0, “No
error.”
The error queue is cleared when:
•
the instrument is powered up,
•
the instrument receives the *CLS common command, or
•
the last item is read from the error queue.
Status Reporting
Error Queue
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