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Monitoring the Instrument
Status registers
Almost every program that you write will need to moni-
tor the Agilent 86121A for its operating status. This
includes querying execution or command errors and
determining whether or not measurements have been
completed. Several status registers and queues are pro-
vided to accomplish these tasks.
In this section, you'll learn how to enable and read these
registers. In addition to the information in this section,
you should review the commands documented in
mon Commands" on page 5-3
on page
5-53.
The WDM channel analyzer provides four registers
which you can query to monitor the condition of the
instrument. These registers allow you to determine the
following items:
• Status of an operation
• Availability of the measured data
• Reliability of the measured data
All four registers are shown in the figure on the follow-
ing page and have the following uses:
Register
Status Byte
Standard Event Status
OPERation Status
QUEStionable Status
Monitoring the Instrument 4-15
and
"STATus Subsystem"
Definition
Monitors the status of the other three
registers.
This is the standard IEEE 488.2 register.
Contains bits which indicate the status
of the other two registers.
Contains bits that report on the normal
operation of the instrument.
Contains bits that report on the
condition of the signal.
"Com-
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