4- 18
Status Reporting
Error Queue
Error Queue
As errors are detected, they are placed in an error queue. This queue is a first-
in, first-out queue. If the error queue overflows, the last error in the queue is
replaced with error -350, “Queue overflow.” Any time the queue overflows, the
oldest 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 any of these events occur:
• When the oscilloscope is powered up.
• When the oscilloscope receives the *CLS common command.
• When the last item is read from the error queue.
For more information on reading the error queue, refer to the
:SYSTEM:ERROR? query in the System Commands chapter. For a complete
list of error messages, refer to the chapter, “Error Messages.”
Output Queue
The output queue stores the oscilloscope-to-computer responses that are
generated by certain oscilloscope commands and queries. The output queue
generates the Message Available summary bit when the output queue contains
one or more bytes. This summary bit sets the MAV bit (bit 4) in the Status Byte
Register. You may read the output queue with the HP Basic ENTER statement.
Summary of Contents for Infiniium 8000A
Page 1: ...Agilent Technologies Infiniium 8000A Programmer s Reference ...
Page 2: ......
Page 20: ...Contents 16 ...
Page 21: ...1 Introduction to Programming ...
Page 43: ...2 LAN and GPIB Interfaces ...
Page 53: ...3 Message Communication and System Functions ...
Page 58: ...3 6 ...
Page 59: ...4 Status Reporting ...
Page 78: ...4 20 Figure 4 3 Status Reporting Decision Chart ...
Page 79: ...5 Programming Conventions ...
Page 84: ...5 6 Programming Conventions The Command Tree Figure 5 1 Command Tree ...
Page 85: ...5 7 Programming Conventions The Command Tree Figure 5 2 Command Tree Continued ...
Page 86: ...5 8 Programming Conventions The Command Tree Figure 5 3 Command Tree Continued ...
Page 87: ...5 9 Programming Conventions The Command Tree Figure 5 4 Command Tree Continued ...
Page 88: ...5 10 Programming Conventions The Command Tree Figure 5 5 Command Tree Continued ...
Page 89: ...5 11 Programming Conventions The Command Tree Figure 5 6 Command Tree Continued ...
Page 94: ...5 16 ...
Page 95: ...6 Sample Programs ...
Page 149: ...7 Acquire Commands ...
Page 176: ...7 28 Acquire Commands SRATe AUTO ...
Page 177: ...8 Bus Commands ...
Page 187: ...9 Calibration Commands ...
Page 195: ...10 Channel Commands ...
Page 223: ...11 Common Commands ...
Page 247: ...12 Digital Commands ...
Page 254: ...12 8 ...
Page 255: ...13 Disk Commands ...
Page 300: ...13 46 Disk Commands STORe Obsolete ...
Page 301: ...14 Display Commands ...
Page 322: ...14 22 ...
Page 323: ...15 External Trigger Commands ...
Page 343: ...16 Function Commands ...
Page 382: ...16 40 ...
Page 383: ...17 Hardcopy Commands ...
Page 391: ...18 Histogram Commands ...
Page 403: ...19 InfiniiScan ISCan Commands ...
Page 421: ...20 Limit Test Commands ...
Page 429: ...21 Marker Commands ...
Page 452: ...21 24 ...
Page 453: ...22 Mask Test Commands ...
Page 499: ...23 Measure Commands ...
Page 636: ...23 138 Measure Commands VUPPer ...
Page 637: ...24 Pod Commands ...
Page 642: ...24 6 ...
Page 643: ...25 Root Level Commands ...
Page 645: ...25 3 STORe SETup STORe WAVeform TER Trigger Event Register VIEW ...
Page 674: ...25 32 ...
Page 675: ...26 Self Test Commands ...
Page 679: ...27 System Commands ...
Page 694: ...27 16 ...
Page 695: ...28 Time Base Commands ...
Page 708: ...28 14 ...
Page 709: ...29 Trigger Commands ...
Page 822: ...29 114 ...
Page 823: ...30 Waveform Commands ...
Page 893: ...31 Waveform Memory Commands ...
Page 902: ...31 10 ...
Page 903: ...32 Error Messages ...
Page 914: ...32 12 ...