Agilent Technologies ESA-E E4401B, User'S/Programmer'S Reference

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212 Chapter 4
Status Registers
Use Status Registers to Determine the State of Analyzer Events and Conditions
S
ta
tus
R
e
gi
s
ters
returned.
The transition filter specifies which types of bit state changes in the condition register will set
corresponding bits in the event register. The changes may be positive (from 0 to 1) or negative (from 1 to
0). Send the
:STATus:OPERation:NTRansition <num>
(negative transition) command or the
:STATus:OPERation:PTRansition <num>
(positive transition) command (where
<num>
is the
sum of the decimal values of the bits you want to enable).
The STATus:OPERation event register latches transition events from the condition register as specified
by the transition filters. Event registers are destructive read-only data. Reading data from an event
register will clear the content of that register. To query the event register, send the
:STATus:OPERation:[:EVENt]?
command.
The STATus:OPERation event enable register lets you choose the bits that will set the operation status
summary bit (bit 7) of the status byte register to 1. Send the
:STATus:OPERation:ENABle <num>
command where
<num>
is the sum of the decimal values of the bits you want to enable.
For example, to enable bit 9 and bit 3 (so that whenever either bit 9 or 3 is set to 1, the operation status
summary bit of the status byte register will be set to 1), send the
:STATus:OPERation:ENABle 520
(512 + 8) command. The
:STATus:OPERation:ENABle?
command returns the decimal value of the
sum of the bits previously enabled with the :STATus:OPERation:ENABle <num> command.
STATus:QUEStionable Registers
STATus:QUEStionable registers monitor the overall analyzer condition. They are accessed with the
:STATus:OPERation
and
:STATus:QUEStionable
commands in the
:STATus
command
subsystem.
The STATus:QUEStionable registers also monitor the analyzer to see if there are any questionable events
that occurred. These registers look for anything that may cause an error or that may induce a faulty
measurement. Signs of a faulty measurement include the following:
• hardware problems
• out of calibration situations
• unusual signals