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1 Glossary
Actuate/De-Actuate: These terms are used instead of 'make' and 'break' to allow us to
distinguish between performing an action due to an environmental condition and whether
the contact may be closed ('made') or open ('break') because of our use of double throw
contacts, and the option of normally energized relays.
Averaging: When setting alarms, the alarm can be set to operate on the basis of the
average signal assigned to that relay.
Baud rate: A measure of the speed at which data is transferred over a digital
communication link. Given as bit per second (bps). Generally the lower the speed, the
more reliable.
bps: See Baud rate
Configuration Database: System configuration requires entering a great deal of
information concerning relay operation, sensor type and so on.
Dry Contacts: The relay contacts are supplied without power applied to any output
terminal.
Normally Energized: The relay coil is energized in the non-alarm state. This is
sometimes referred to as 'fail-safe' because in the case of controller failure or loss of
power, the relay contacts will open.
Normally Open Contacts: In the non-alarm state, but under power, the contacts are
open.
Latching: A relay once actuated remains actuated even though the condition has been
removed. Requires a manual operation to reset.
Protocol: The actual language of communication between devices, as distinguished from
the electrical standard.
RS-485 (properly EIA-485): A wiring and electrical standard for digital communication
in a multi drop environment. It is a 2-wire system, with a differential signal allowing
relative immunity to variations in grounds between devices. RS-485: maximum 32
transceivers per loop, 4000 ft (1300 meters) max. 120 ohm line termination required.
(Line termination resistors are available on all QEL devices via selectable jumpers).
Stub: A short wiring link branching from the main line.
Q-Controller System Operation Manual
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86550-001-000 Rev B
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