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6.3
Connection to a Burglar Alarm
The system features an optically isolated input terminal which is driven low (to GND
or -VE) in the active state. The A or B terminal is held at approximately 13V (or +VE if
VIN is less than 13V) through a 4400 Ohm load. The A or B terminal on the Alpha Re-
lay Board may be connected to the –VE terminal of a burglar alarm bell output (or
other programmable open collector output) to allow the system to be used as an
alarm auto-dialler and SMS sender. Both equipment must share a common GND
connection—connect GND to panel ground.
Please note, whilst most alarms pull the negative terminal down to ground when
active, the installer should ensure this is the case with their alarm system. If the alarm
output goes from GND to +VE or open circuit the INLEVEL settings must be changed
(see section 4.3). Alternatively it may be necessary to use an intermediate relay
board
for
connection
port@adventcontrols.co.uk
6.4
Output Connection
The relay output has Normally Open (NO) and Normally Closed (NC) relative to
COMmon (COM) connections. These can be actuated in a momentary operation
or can be toggled (see 3 Setup).
The connections are 'voltage free' with no connection to +VE or GND. The relay
connections have a minimum creepage distance to GND greater than 5mm and
are CATII rated to 220V.
to
some
systems.
for assistance.
Input Circuit Reference Schematic
Please
contact
sup-
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