20 900 Series V5.0: Installation Guide, April 1999
3.3.7. Switch monitor plus - II953
There are eight terminals, four for the loop connections (incoming and outgoing), two for
an opto-coupled output and two for the external switch connection.
Figure 15: Wiring diagram for Switch Monitor Plus
To install the Switch Monitor Plus:
1. Mount the Switch Monitor Unit as required. The Series 950 Switch Monitor Plus is not
designed for outdoor use unless it is mounted in a suitable weatherproof enclosure.
2. Connect the communication line to the L1 and L2 inputs. The inputs are unpolarised,
but it is recommended to keep L1 negative for consistency.
3. Connect the switch contacts to the switch inputs. The switch input is monitored for
open or short circuits.
4. A software controlled remote opto-isolated output is supplied. Before connecting a
beam detector or similar device, first check to see if the device has a factory fitted
Apollo-compatible connection for the reset. If not, you must devise a circuit for remote
resetting of the beam detector. The circuit diagram (Figure 16) shows a typical method
of connection.
Figure 16: Circuit for remote resetting
R1
0V
TR1
RLY1
+24V
D1
R1 = 10 kOhm ¼ W
D1 = 1N4007
TR1 – BC337
RLY1 = 24 VDC coil, 350 Ohm or greater
OPTO -
OPTO +
SW –
SW +
L1 (-ve) *
L2 (+ve) *
* L1 and L2 are polarity insensitive but it is recommended to keep L1 negative for consistency.
Series 950 loop
1 kOhm
10 kOhm
20 kOhm ± 10%
1/3 W
À Normally closed fault contact  Fire alarm
Á Pre-alarm à The opto sinks 1 mA max. at 30 V max.
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