User's Manual

Event Notification
The AR400 reader provides notification when particular 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. 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.
Visibility Events
These events occur when tag visibility changes. There are three types of visibility events:
• New tag event: occurs every time the AR400 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 AR400. The two
types of network status events are Device and Program.
Device events can indicate whether the status change is reported for the device or in association with a
parent device. For example for a disabled AR400, the AR400 receives a 'user/disable' status
notification, and the read point(s) associated with the AR400 receive a 'user/disable/parent' notification.
Similarly, if a device fault occurs for the AR400, all corresponding events for the device fault also occur
for each read point associated with that AR400. After correcting the fault, enabling the AR400 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.