Agilent Technologies ESA-E Series Programmer's Manual page 33

Status Registers
Use Status Registers to Determine the State of Analyzer Events and Conditions
Refer to the right-hand part of the STATus: QUEStionable register
while reading the following register descriptions.
Condition
Register A condition register continuously monitors the
hardware and firmware status of the analyzer. There is
no latching or buffering for a condition register.
Negative
Transition
Filter A negative transition filter specifies the bits in the
condition register that will set corresponding bits in the
event register when the condition bit changes from
1 to 0.
Positive
Transition
Filter A positive transition filter specifies the bits in the
condition register that will set corresponding bits in the
event register when the condition bit changes from
0 to 1.
Event
Register An event register latches transition events from the
condition register as specified by the positive and
negative transition filters. Bits in the event register are
latched, and once set, they remain set until cleared by
either querying the register contents or sending the
*CLS command.
Event
Enable
Register An event enable register specifies the bits in the event
register that can generate a summary bit. Summary
bits are, in turn, used by the status byte register.
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