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MEDEA Installation Manual
Glossary
AND
A logical function that requires that all the terms of the operation be true in order for
the result to be true.
Open
An input is open when it receives a signal from a detector that is no longer in stand-
by, for example, because of an attempted intrusion has been detected.
ATS
Acronym of Alarm Transmission System. Depending on the performance they can
offer, they are classified from ATS 1 to ATS 6, where ATS 1 is the simplest system
and ATS 6 is the system with the highest level of performance.
Communicator
A device capable of sending and transferring alarm signals and events via a telephone
line.
Default
Default value of a configurable parameter. This is the value of the parameter when it
leaves the factory or after a reset operation.
DTMF
Dual Tone Multi Frequency, indicates the "tone" mode of composition of a telephone.
Entry
A point of access to rooms protected by the intrusion alarm system.
Event
A fact that occurs accidentally or when a specific condition is met, for example when
a certain period of time has passed.
Physical
address
Method by which the control unit recognises the device, which cannot be changed and
is assigned by the control unit. It addresses the inputs and outputs.
Logical address
Addresses freely assignable by the installer to help him identify detectors, outputs and
installed devices. Used by the control unit to display inputs and outputs and identify
the alarms sent.
OC
Open Collector transistor. Electrical output.
OR
A logical function that requires that at least one of the terms of operation be true for
the result to be true.
Way
A set of one or more inputs that temporarily inhibit the signalling of sensor alarms
connected to enable the entry into or exit of a protected partition. The temporary
disabling time is called as entry or exit time. If neither the entry time nor the exit time
are being counted down, the activation of the detector generates an intrusion alarm
immediately.
Input/Output
PrIO
Connection point (terminal) that can be configured as input or output.
When configured as an input it can be used to physically connect a detector (usually
a sensor or a contact). Several detectors can also be connected to one input (up to
two in tandem configuration) and they are seen as physically separate items. The input
is defined as being open when the sensor signals that it is no longer in stand-by, for
example because it has verified an attempted intrusion.
When configured as an output, it can be used to connect of devices and actuators with
which the intrusion alarm system can operate in the outside world. For example, it can
signal an alarm (with a siren), communicate a system status (with a warning light or
buzzer) or activate electrical equipment.
First entry
Activation of the detector triggers the "Entry Time 1" delay times of the sectors
associated with the detector. During this time, the activations of the "Route" specialised
detectors that have at least one sector in common are ignored. When the delay time
has expired, the alarm is generated.
First entry
–
Last exit
Combine the "First entry" and "Last exit" behaviours to enable the use of the same
access door for both exit and entry.
Protocol
Set of rules that govern the exchange or the transmission of data among devices.
PSTN
Public Switched Telephone Network indicates the telephone land line.
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