Agilent Technologies N1996A-503 User Reference page 327

• Monitor a particular condition (bit).
You can enable a particular bit(s), using the event enable register. The instrument will
then monitor that particular condition(s). If the bit becomes true (0 to 1 transition) in
the event register, it will stay set until the event register is cleared. Querying the event
register allows you to detect that this condition occurred even if the condition no longer
exists. The event register can only be cleared by querying it or sending the *CLS
command.
• Monitor a particular type of change in a condition (bit).
— The transition registers are preset to register if the condition goes from 0 to 1 (false
to true, or a positive transition).
— This can be changed so the selected condition is detected if the bit goes from 1 to 0
(true to false, or a negative transition).
— It can also be set for both types of transitions occurring.
— Or it can be set for neither transition. If both transition registers are set to 0 for a
particular bit position, that bit will not be set in the event register for either type of
change.
Chapter 6
Using The Status Monitoring Subsystem
How to Use the Status Registers
327