User Manual

XR400 RFID Reader Integrator Guide3-26
Event Notification
The XR400 reader provides notification when particular events occur. Select the events to subscribe to using the Event Notification
window. Select whether to receive event notifications, and select from three different types of events:
• Visibility events
• Threshold events
• Network status events.
Visibility Events
These events occur when tag visibility changes. There are three types of visibility events:
• New tag event: occurs every time the XR400 reads a new tag.
• Tag not visible event: occurs when the system knows about the tag but the tag is no longer visible.
• Visibility changed event: a generic event that occurs when the read point that read the tag changes.
Threshold Event
Threshold events occur when the number of visible tags drops below or rises above a threshold specified via a tag list notification
reply.
Network Status Event
Network status events indicate a change in reader status, e.g., a problem with the reader. There are two types of network status
events:
•Device
•Program.
Device events can indicate whether the status change is reported for device or in association with a parent device. For example for
a disabled reader, the reader receives a 'user/disable' status notification, and the read point(s) associated with the reader receive a
'user/disable/parent' notification.
Similarly, if a device fault occurs for the reader, all corresponding events for the device fault also occur for each read point associated
with that reader. After correcting the fault, enabling the reader also enables 'parent disabled' devices associated with it.
Exception Events
Exception events provide the same type of information available via SNMP, but using XML. An exception event provides information
when a device goes off-line, polling is turned off, etc. Select this option if there is no SNMP support, but you require notification if
the device/program changes state.
The Event Notification window provides the following parameters:
• Host Notification: web-based notifications of events are sent to this link. Typically this is the URL of the web server which
is running an application which can trap and display these notifications.
• Send SNMP Trap To: This is the IP address of the SNMP server to which to send event traps.