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Interval
：
Set the periodical sending is effective interval. Min value is 1 min and Max value is
24 hour.
Effective period
：
Set the period when the periodical sending is effective.
Always
：
The periodical sending is always effective.
Schedule
：
You can specify the period when the periodical sending is effective in the schedule
setting in the other section. Click Schedule and the setting menu for the effective period is
displayed. (“Setting the Schedule — Schedule setting Menu” on page 34)
