Bosch BIS 2.3 Installation Manual page 95

BIS 2.3 - Access Engine
A query of a location, for example, would be acknowledged by a
data telegram, the changing of the location by an event
telegram.
Data changes
Each data change in the DMS triggers an event message to the
Loggifier. The ACSP is also informed of this by this mechanism.
If access-relevant data is changed, the ACSP generates a data
change telegram and sends it to the MAC. Each of these
telegrams is acknowledged by the MAC.
Event messages
All relevant system events are recorded by the access control
system. These include successful, unsuccessful and interrupted
access attempts. All these events are sent to the ACSP by the
MAC with an event telegram and the ACSP then enters them in
the appropriate DMS event logs.
If a transmission to a process fails, then the transmitting
process buffers all messages accumulated during the
malfunction. Once the malfunction has been removed, these
buffered messages are appended. This ensures that no event
messages are lost.
Device statuses
The status of the access control system devices (with the
exception of the MAC itself) is monitored by the MAC. Each
change of a device status is reported to the ACSP as an event
message. The ACSP enters the message in the appropriate
logbook and posts the new device status in the DMS database.
The MAC itself is monitored by the ACSP by means of regular
status telegrams from the MAC to the ACSP. If these telegrams
fail to arrive then the MAC is marked as faulty.
The MAC in turn monitors the status of the DMS server. If it
determines a malfunction, it generates an event message to this
effect. If the malfunction is corrected, this message is sent to
the ACSP, together with the event messages that have been
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DMS - Data Management System | en
Installation manual F.01U.028.713 | V 2.3.0.1 | 2009.11
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