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The Workstation Installation/Operation Manual Version 2 Document 51540 Rev. B1 4/8/02
Section 2.2: Event Handling
2.2.1 About Events
An Event is any change in the status of a device or a transfer of information between a device and the workstation
or between two devices. Some of these events are considered background and housekeeping events and are not
seen by the user. The events that are of primary concern to the operator are those identified as Off-Normal
Events .
An Off-Normal Event is an event that indicates activity or change in condition requiring the attention and/or
response of an operator. Examples of possible off-normal events include:
• A change in condition or activation of a monitoring device (Motion Detectors, Smoke Alarms, etc.).
• An invalid card swiped through a networked card reader.
• A door is ajar.
• A NION becomes disconnected from the network.
• A Monitoring device is disconnected from its monitoring NION.
Off-normal events seen by the operator can be grouped into two categories:
• Paired Events - Events which after acknowledgment still require another event to return the associated
device to its original state. This second event may be initiated by the operator (as in the case of sending a
reset to a device or panel), or initiated by the original device itself (such as an alarm server which
originally went off-line and is coming back on-line). Devices can send more than one off-normal event
before the related return state event is sent. For example, a fire panel may have more than one alarm state,
and these will not clear until all events have cleared and the panel reports an all clear state.
• Single Events - A single event that, once it is received, leaves the sending device in the same condi-
tion that it was in originally. A good example of a single event is a card access event, which does not
actually change the status of the device.
2.2.2 Types of Events
Events which come into the workstation and are displayed in the event box on the main screen can be divided into
five fundamental categories:
• Security Alarms - Events issued by security related devices such as motion detectors, glass break
detectors, and door contacts.
• Fire Alarms - Events issued by fire protection related devices such as pullstations, smoke detectors,
and sprinkler systems.
•
Supervisory Alarms
- Supervisory alarms are special alarms to indicate action that has functionally
disabled a key device (for either fire protection or security). An example of this is the event generated if the
water valve is shut off for a sprinkler system.
• Access Control Events - Events issued by card access reader panels, such as a card swipe event or
an invalid card read.
• Trouble Events - Trouble events indicate a functional problem with a device on the network.
Examples of trouble events include a device or workstation going off-line, a battery low or no power event,
a clogged head on a smoke detector, etc.
2.2