Philips LBB 1330 Instructions For Use Manual Download Page 23

Page: 23 / 140

4. OPERATING AND PROGRAMMING THE SM40 SYSTEM

4-1

4.1

Central Processor Card - CPC

At the heart of the SM40 Public address Distribution System is the Central Processor Card (CPC). Capable
of controlling 16 or 32 call stations; 320 user keys; 1024 matrix points; 2 x 128 relays, 16 Digital Message
Cards and 8 signal generators; this is a powerful piece of equipment, providing a system of this type with
previously unheard of possibilities.

The basic functions of this card are as follows:

DETECTION

of call station user keys. Using information given it by the Input Card (IPC), the unit is

capable of sensing which user key is being pressed.

ROUTING

of microphones and attention signal tones (actuated by user keys), alarm tones, digital

messages, background music, etc., via Matrix Card (MC) to amplifiers and loudspeakers located in
geographical and/or functional zones.

USER KEY PRIORITY

level setting. To cope with conflict situations (e.g. when 2 call stations attempt to

call the same zones simultaneously) each user key is given a priority level of 0-9, 9 being highest priority.

ATTENTION SIGNAL TONES

, are coupled with the user keys so that when a key is pressed the tone will

be broadcast before or instead of an announcement. Dependant on their character these tones may also be
used as alarm signals or test tones.

DIGITAL MESSAGE CARD

control, allows per card up to 7 messages with varying duration up to a

maximum of 65 seconds to be recorded, and played back as desired. The maximum number of cards per
centre is 16.

SWITCHING

of loudspeaker volume control override circuits, and bypassing of the input attenuators in

the SQ45 amplifiers, via the Control Relay Card (CRC).
SWITCHING of amplifier outputs for loudspeaker group switching, via ‘unlocked’ Control Relay Cards.

CHECKING

of system hardware. The processor acts as a “watchdog”, continuously scanning the SM40

system hardware to check for errors, malfunctions or disconnections. If a problem exists a message is
displayed on the lcd screen of the Display & Keyboard; for instance if Call Station 3 is disconnected the
message displayed is:

REAL TIME CLOCK

is built into the unit, and is displayed, giving date, hours and minutes. A timer

facility is coupled to the clock, making it possible to switch on and route tones, recorded messages and
music at specific times of the day, or week.

A yellow LED, mounted on the front edge of the (CPC) card advises that the unit is running with the rest
of the SM40 system, and 1 green LED indicates that adequate supply voltage is present.

A Display & Keyboard mounted on the rack unit’s front panel, is used to carry out installer and user
programming as listed above. When programming is complete, the unit returns to its idle mode and, until a
secret password is entered it has no influence on the processor.
In this state the day, date, and time are displayed.

The CPC has 2 driver stages providing communication lines for up to 80 cards approximately. All circuit
cards controlled by the CPC must be mounted as close as possible to the CPC. All other cards may then be
mounted in as many frames as are necessary.

* * * * ERROR * * * *

CALL/ALARM STATION 03