User Manual

Fibre Optic Master and Remote Site
User Handbook
Document Number: 60-212701HBK - Issue No. 1 Page 14 of 50
Fibre Optic Receiver (20-005501) ‘D’ Type Female Connector Pinouts
Pin No. Signal Description
1 +10-12V DC Power
2 0V DC, Power Ground
3 0V DC, Power Ground
4 No Connection
5 No Connection
6 TTL Alarm, (0V=good, open coll.= fail)
7 Relay Alarm Contact (N.C)
8 Relay Alarm Contact (Common)
9 Relay Alarm Contact (N.O)
3.4.6. 12V Relay Assembly (80-008901)
The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is
equipped with a single dual pole change-over relay RL1, with completely isolated wiring, accessed
via a 15 way in-line connector.
The relay is provided with polarity protection diodes and diodes for suppressing the transients caused
by "flywheel effect" which can destroy switching transistors or induce spikes on neighbouring circuits.
Its common use is to amalgamate all the alarm signals into one, volts-free relay contact pair for the
main alarm system.
80-008901 Specification
PARAMETER SPECIFICATION
Operating voltage 8 to 30V (floating earth)
Alarm threshold Vcc - 1.20 volt +15%
Alarm output relay contacts
Max. switch current 1.0Amp
Max. switch volts 120Vdc/60VA
Max. switch power 24W/60VA
Min. switch load 10.0µA/10.0mV
Relay isolation 1.5kV
Mechanical life >2x10
7
operations
Relay approval BT type 56
Connector details Screw terminals
operational -10°C to +60°C Temperature
range
storage -20°C to +70°C