GLOSSARY
D-282
System 2 Installation / Programming Manual
CPU
Central Processing Unit. Usually the main microprocessor in the system.
CTS
Clear to Send. An RS-232 input on the system that tells a transmitting device attached to it that
its OK to transmit its data.
Data Chip
A stainless steel canister, the size of two stacked dimes, containing an integrated circuit that
sends a 64 bit number when touched to a reader designed for the purpose.
DC
Direct Current. A type of voltage usually specified as having a positive and negative source.
Default
Preset values in the software which the System will use if the user does not change them.
Disabled
Turned off. Not active.
Door Ajar
A condition that occurs when a door is left open after a valid user has passed through.
Earth Ground
A direct electrical path to earth. Usually a cold water pipe, the steel beams of a building, or a
steel rod driven at least six feet into the earth and bonded to the Electrical System as defined by
the National Electrical Code.
Enabled
Turned on. Active.
Enter
To type information on the System in response to a prompt. To complete the entering of a code
or command by pressing the #.
EEPROM
Electrically Erasable Programmable Read Only Memory. A memory chip used in the System
that contains special information. EEPROMs retain all information without the need for backup
power.
ESN
Electronic Serial Number. A 64 bit number, permanently programmed into a non-volatile
memory device. Used to identify a particular unit, date of manufacture and other parameters.
Events
An action, condition or something that happens on the access system and becomes part of the
information stored in the event data base. Event conditions can be used to trigger auxiliary
outputs.
Fail-Safe
If and when power to the door fails, the door will be made permanently-open and allow entrance
or exit without the need for access control codes or Cards.
Fail-Secure
If and when power to the door fails, the door will be made permanently closed and will not allow
entry or exit.
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