Philips SM30 User Manual download pdf (Page 34)

32

13 CONTROL RELAY MODULE

(CRM) LBB 1288

The Control Relay module provides SM30

with a set of switching contacts, which can

be opened or closed (dependent on the

contact, and its terminations) as

programmed by the installer or operator.

Relays 1 to 8 have both make and break

contacts. Relays 9 to 12 have make contacts.

These contacts can be used to start remote

equipment, such as cassette players, message

loggers, etc.; to activate signalling/warning

lamps; to release ﬁre door relays; etc..

13.1 Operation

Relay 1 is reserved for the indication of

microprocessor errors, and cannot be used

for any other function.

Relay 2 is reserved for indication of all other

internal errors (modules and Call Stations),

and cannot be used for any other function.

Relay 3 is dedicated to the ‘Delayed Power

On’ function, but may be used for other

functions if Power On Delay is not required.

The Delayed Power On function is intended

for battery operated systems where, in order

to conserve battery power, the SQ45

ampliﬁer(s) is/are switched on only when a

call is made. It causes a time delay (selectable

from 2-9 seconds) between pressing the Call

Station ‘Press-To-Talk’ key, the Microphone

‘on’ switch or switching-on of a Control

Input and the actual activation of the call.

Both sides of the normal ‘open’ contact of

relay 3 are wired to the switch terminations

on the SQ45 ‘DC Power’ Mate-N-Lok

connector(s). The software causes the relay

contacts to close (‘make’), switching on the

DC power of SQ45. (See the SQ45

Instructions for Use for further details).

Relay 4 is dedicated in case an external

audio source connected to an input of the

Fig. 12.3 - Input splitting

X

X

X

CALL ( ZONE 1,2,3,4 )

MUSIC ( ZONE 1,2,3,4 )

CALL ( ZONE 5,6 )

MUSIC ( ZONE 5,6 )

3

6

2

1

4

5

7

8

9

101112

3

2

1

4

5

6

LS GROUP

I

3

6

2

1

4

5

7

8

9

101112

Fig. 13 - CRM

LBB 1288

9

1

3

5

7

10

8

6

4

2

1112

GB/SM 30 user manual 5/26/98 10:18 AM Page 32

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