Alarms - VTI Instruments EX1401 User Manual

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Alarms

LXI alarms are a mechanism that generates events at a fixed time interval as specified by IVI 3.15,
IVILxiSync specification. When the Enabled property is true, the alarm starts at the time specified
by TimeSeconds and TimeFraction and repeats for RepeatCount times. The Period property defines
the interval between the two successive alarm events. Setting the RepeatCount property to 0 causes
the alarm to continue firing at the specified Period until the Enabled property is set to false. Setting
the Period to 0 causes the alarm to fire only once. The alarm properties can only be modified when
the alarm is disabled.
As an extension to the LXI alarm capabilities, the EX1401 also supports "now" alarms (similar to
"now" LAN events). Setting the TimeSeconds and TimeFraction properties to 0 causes the alarm to
fire as soon as it is enabled.
Alarms can be used as an arm or a trigger event source.
78 EX1401 Instrument Drivers