M750 and M800 Installation Instructions 11
1111
11
Relay
Smoke
Detector
Relay available from
RS components
P/No. 351-982.
Capable of switching
mains voltages
+ 12 V
Aux 0V
+ve O/P
(Programmed as Alarm / Bell / etc)
(Programmed as Detector Reset)
Aux 0V
Aux 0V
Aux 0V
1K0 Ohm Resistor
12V Buzzer
RS Part No. 245-051
LED (Light Emitting Diode)
+ve O/P
+ve O/P
+ve O/P
0V
Diode (IN4001)
Figure 10: Examples of using Switched-Positive Outputs
Relay Output
("8" in Figure 2.)
The relay output provides a voltage-free changeover
contact, which can be programmed to switch
external equipment on or off.
Connect one side of the external device to the COM
terminal, and the other to either N/O or N/C. The
effect is as follows:
• If you connect to N/O, the contact between COM
and N/O is normally open, and is closed only
when the output is active.
• If you connect to N/C, the contact between COM
and N/C is normally closed, and is opened only
when the output is active.
See Figure 11 for an example.
+12Vdc
0V
Device
COM
N/C
N/O
Figure 11: Example of using a relay programmable output
External Bell/Sounder Connections
("9" in Figure 2.)
If required, an external sounder can be connected to
the control panel. Connection details are shown in
Figure 12.
Typical
External Sounder
Control Panel
H/O +
12V +
H/O -
0V
Tamper In
TR -
STB -
Tamper Out
TRG -
Strobe +ve
Strobe -ve
Trigger -ve
Figure 12: External Sounder Connections
The meaning of each terminal is as follows:
H/O+ This is used to provide a permanent +ve hold
off to external sounders, strobes, etc.
H/O - This is used to provide a permanent -ve hold
off to external sounders, strobes, etc.
TR - This is the negative tamper return connection
from the external sounder unit.
STB - This is the strobe trigger output, which switches
to 0V on alarm and is rated at 500mA.
Normally. this output is connected to the
strobe -ve; the strobe +ve is connected to
H/O+.
TRG - This is the bell trigger output, which switches to
0V on alarm and is rated at 500mA. This
output can be programmed for SAB or SCB
operation, and operates as follows:
SAB switches to 0V on alarm and provides a
maximum of 500mA.
SCB provides a negative hold off (500mA),
which is removed on alarm.
Additional external sounders can be driven from
XNodes or MNodes (using an RM3A relay module)
Auxiliary Tamper Input
("10" in Figure 2.)
The AUX TMP terminals provide a tamper-switch input
for an auxiliary device such as a remote power
supply unit or extension loudspeaker. If the input is not
used, it must be linked out.
Line Fault Input
("11" in Figure 2.)
The system generates a line fault alert if +12Vdc is
applied to the LINE FLT input. If the system is unset
when this occurs, a "Chime" tone is generated every
minute until the condition is reset. If the system is set,
any programmed bell delay is cancelled.
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