3 - 32 XR Series RFID Readers Integrator Guide
Event Notification
The XR Series RFID readers provide notification when selected events occur. Select whether to receive event
notifications, and select from three different types of events:
•
Visibility events
•
Threshold events
•
Network status events
The
Event Notification
window provides the following parameters:
•
Host Notification
: Web based notifications of events are sent to this link. This is the URL of the web server
running an application that traps and processes the notifications.
•
Send SNMP Trap To
: This is the IP address of the SNMP server to which to send event traps.
Visibility Events
These events occur when tag visibility changes. There are three types of visibility events:
•
New Tag Event
: occurs every time the reader reads a new tag. A
New Tag Event
is a special case event
generated to notify the user that a new tag has appeared for the first time. This event should be processed in
a timely fashion to give meaningful results, set the
Notify
option to
Immediate
(the default). To disable
notification for this type of event, set the
Notify
option to
Never
, the event is now promoted to a generic
Visibility Changed Event
.
•
Tag Not Visible
event: occurs when the system knows about the tag but the tag is no longer visible. A
Tag
Not Visible Event
is a special case event generated to provide a notification when a tag is not currently visible
to any
Read Point
. Since there may be cases, in the normal course of operation, that a tag has transient
periods when it is changing visibility in the system, set the
Notify
option to
Moderated
to smooth out
temporary conditions and generate an event only when the tag is no longer being actively tracked. The
system still knows about the tag, but it is not visible to any Read Point. To disable notification for this type of
event, set the
Notify
option to
Never
, the event is now promoted to a generic
Visibility Changed Event
.
•
Visibility Changed
event: a generic event that occurs when the read point that read the tag changes. A
Visibility Changed Event
is a generic event generated when the
Read Point(s)
where a tag is detected
changes. The visibility change may be due to additional, fewer, or even no
Read Points
. If Tag Not Visible
Events is enabled, then the
No Read Point
case will use that event instead. A New Tag Event will be
generated for the first time a particular tag is seen anywhere. This event should be processed in a timely
fashion to give meaningful results, set the
Notify
option to
Immediate
(the default).
Threshold Event
Threshold events occur when the number of visible tags drops below or rises above a threshold specified in a tag
list notification reply.
Generating Threshold Events
Threshold events are generated when the number of visible tags drops below or rises above a specified threshold
from a process tag List notification. There may be cases, in the normal course of operation, that a tag may have
transient periods when it is changing visibility in the system, set the
Notify
option to
Moderated
to smooth out
temporary conditions and generate an event only when the tag is not experiencing a temporary moment of
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