Cambridge Sound Management Qt Emitters Installation And Operation Manual page 28

SYST E M SE T- UP AND CALIBR ATIO N
Exiting Set-Up mode to return to User Mode: Hold down the ON and OFF buttons (left and right) for 5
seconds, then the display will blink three times.
Commissioning ramp
With traditional sound masking systems, a commission process is use that ramps up the sound masking
over several weeks' time. In the case of the Qt CRE system, because sound masking is user-initiated at
the time of using the conference room, no commissioning ramp is used.
Contact closure
Contact closure may be used for remote control by an automation system, or purely as a trigger for
ducking an emergency notification.
Contact closure, when triggered (contacts closed) changes from current operating level (whether OFF,
Low, or Normal) to Low level. In the case of remote control by an automation system, this Low level may
be a more comfortable setting than an actual change to silence (full off) - this is at the discretion of the
installer. Typically for ducking emergency notification, however, the Low level should be set to "MUTE."
Contact closure has its own settable ramp up and down speed. Default ramp down will be instantaneous
as this matches expectations for ducking emergency notification. Ramp up will default to 5 seconds
which provides a more gentle recovery.
Contact closure overrides selections from the front panel, and the keypad is locked at this time. Contact
closure when released returns the unit to Normal level.
Paging / music input
Input A will be ON regardless of masking level or contact closure setting. (Meaning paging – if used –
would work even if masking is off).
Qt Conference Room Edition Installation and Operations Guide page 28