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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