User's Manual

CHAPTER 3 NANOSCANNER SYSTEM FUNDAMENTALS
NANOSCANNER READER USER GUIDE • DOC # 8101029-000 REV A 27
© 2003 Alien Technology™
Notification Mode
The last stage in configuring the autonomous mode is to tell the reader under
what conditions to notify listeners about tag lists. Listeners (network applications /
people) will be notified only when preset conditions arise, such as when new tags
are read, or tags disappear from view.
• Set NotifyTime = time (secs)
The NotifyTime command instructs the reader to send out a copy of its tag
list to a listener every n seconds, regardless of changes to the tag list or not.
Thus, this is a simple, predetermined way to force the reader to send out its
tag list to a listener.
• Set NotifyTrigger = trigger
The NotifyTrigger command specifies a trigger that must occur before a tag
list is sent out to a listener. There are a number of permissible triggers than
can be set:
Trigger Name Meaning
ADD Send message when new tag is read and added to the tag list
REMOVE Send message when a tag is removed from the tag list
CHANGE Send message when a tag is either added to or removed from
the tag list
TRUE Send messages when the evaluation task of the autonomous
state loop evaluates to true, i.e., typically when tags are added
FALSE Send messages when the evaluation task of the autonomous
state loop evaluates to false, i.e., typically when tags are not
found
TRUEFALSE Send messages when the evaluation task of the autonomous
state loop evaluates to true or false