User manual

Glossary Operating guide for Alarm Receiver Exprecium D 47|52
MCDI SECURITY PRODUCTS INC. 7055 Jean-Bourdon Montréal Québec Canada +514.481.1067 www.mcdi.com [e-mail]
Earth Ground Any device connection or a grounding rod used to connect devices such as D4 to earth. Such a
connection is used as a sink for electrical transients and possibly damaging potentials, such as
those produced by a nearby lightning strike.
E
2
Exprecium
2
mode. Advanced programming for Exprecium
2
generation of receivers. Common to
MCDI Exprecium PCI cards and Decrypta
2
. Suitable with MCDI Catapult and Extrium receivers.
Event MCDI uses this terminology to designate a string of characters or a packet that amounts to a
signal sent from an alarm panel.
Firmware Programs or instructions stored in a PROM. MCDI uses the term firmware to refer to the software
residing on a PROM or EPROM.
FSK Frequency shift keying. In digital communication, an audio frequency is used for 1 and a different
frequency is used to signal 0
FTC Fail to close. Event created when a system remains disarmed at preset time.
FTO Fail to open. Event created when a system remains armed at preset time.
GCI 1800/1900 GSM backup interface by MCDI. Interfaces GSM phone signal to PSTN (RJ11 plugs) and
transfers ring to let alarm receivers such as Decrypta 3 and D4
receive alarm sent over a GSM
network. 900/1800 are the frequencies used is most of the planet. 1900 is mostly used in North
America and parts of South America.
Ground Earth ground.
Ground Loop An alternative path in which current can travel. Ground loops can produce noise.
Ground Lug A lug used for connecting Decrypta 4 alarm receivers to earth ground. Decrypta 4 receivers
should be connected to earth ground to protect them from transient potentials such as nearby
lightning strikes.
GSM Global System for Mobile communcations. Wireless phone system used in most parts of the
world.
GUI Graphical User Interface. Pronounced "goo-ey". Graphical rendering of the programming code
used by the PC.
Half Duplex Each end of a communication circuit can transmit and receive data, but not simultaneously. Most
alarm transmission are of this type.
Handshake Frequency emitted by the alarm panel in order to match the format of the alarm panel. D4
emits
several handshake tones in order to mate with the panel.
Handshake sequence In D4, the ability to specify an order of appearance in order to speed the matching process
between the panel and the alarm receiver.
Heartbeat Single character or group of characters sent from one device to the other at regular intervals.