Philips LBB 1330, Инструкция по эксплуатации

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5. SM40 MODULES
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5
5.12 Call Station - CST LBB 9567
Gooseneck Microphone with line level output, mounted on a table stand. A set of user keys, plus a red
“busy” LED and a green “wait and talk” LED are mounted on the front panel. Each unit contains a
preset gain control with built in limiter.
Call Station (CST) LBB 9567 is a table stand unit on which an electret condenser microphone (mounted on
a goose-neck); 2 LEDs; and 10 pushbuttons (‘user keys’) are mounted. This is the standard input source of
the SM40 Public Address Distribution Centre which will accept a maximum of 16 call stations when a 16 x
64 matrix is used and 32 call stations when a 32 x 32 matrix is used. If music inputs and/or Signal
Generator Cards, and Digital Message Cards are used in the system less stations can be connected.
USER KEY FUNCTIONS are activated by pushing just one of the User Key pushbuttons. These functions:
Key Priority, Signal Tone, Messages and Routing, are programmed at the microprocessor in the central rack
unit.
1. Key Priority Level: can be set giving each key a priority of 0-9: 9 being highest priority, to cope with
conflict situations (e.g. 2 stations attempting to call the same zones simultaneously).
The caller with the highest priority overrides any lower priority callers. When two callers with the same
priority call the same zone, the first caller is switched through, while the microphone of the later caller is
inactive. It is possible to program two user keys on a call station to the same zone but giving one of them a
higher priority level to make announcements of more urgency.
2. Signal Tones: Chime tones are available to precede an announcement; alarm signals are according to
international standards.
3. Digitally Stored Messages: If the system is installed with a Digital Message Card (DMC), up to 7
individual pre-recorded messages of varying duration (max. 65 seconds) can be played back. To play-back
the stored message(s), the system can be programmed such that defined Call station keys will activate the
stored message(s) individually or preceding a call.
4. Routing: assigns a user key to an amplifier, or combination of amplifiers, feeding loudspeakers located in
geographical or functional zones.
LED INDICATORS. Two LEDs are mounted on the Call Station’s front panel to advise the caller whether
the zone selected is clear to call. The green LED is titled ‘wait and talk’ and the red LED:’busy’. Led
indicator functions are as follows:
Green Led flashing: Chime tone and/or message being broadcast. Wait to talk.
Green Led continuous: Ready to talk
Red Led continuous: Conflict situation (e.g. zone being called by a user with the same or higher priority).
Release user key and try again later!
Red Led illuminates while caller is speaking: Call overridden by a caller with a higher priority. Release user
key and try again later!
AMPLIFIER. The call station’s amplifier has an in-built limiter and performs a double function. It gives the
call station microphone a balanced line level output, enabling standard two core screened microphone cable
lengths of up to 1000 metres to be used; and determines the user key current. The volume level of each call
station may be preset, via a hole in the bottom plate. The potentiometer affects the gain before the limiter
and should be matched to the announcer so that the output level is approximately 1 V RMS.
In order to label which zone(s) each User Key represents, paper ‘overlays’ are provided. These overlays are
mounted on the front panel of the CST, and provide enough room to write the name of the zone(s) on.
To access the overlay for marking; remove the 3 screws holding the right hand cover plate, and simply
remove the clear plastic panel.