Dorset identification b.v. Reserves the rights to change
specifications without prior notice
15
Appendix A: Connecting a reader to an alarmsystem.
Five readers can be used to switch an alarmsystem on and off. All other units on the same bus can
only switch the alarm off. For the system to work properly following considerations should be taken
care of
•
All readers which are allowed to switch off the alarmsystem have to be on the same RS485
communication bus.
•
One reader is connected directly to the alarmsystem. The relay of this decoder will switch the
alarm on and off. This reader is often placed in the housing of the alarm system and is connected
to the battery of the alarmsystem, so that it will function even when main power is disconnected.
•
Four other readers near exits can be used to switch the alarm on. These readers should have a
unitnumber in the range of 250 till 253. These readers are only for switching the alarm on and off
and can not be used for opening doors.
•
All other readers connected on the same bus can only switch the alarm off.
•
The alarmsystem has to be switched on and off by a pulse.
•
The alarm must have a potential free alarmstatus output which indicates if the alarm is on or off.
Follow the steps below to connect a LID665 decoder on LID665BP backplane to an alarm system.
Connector numbers are described on page 6.
•
Place one decoder into the housing of the alarmsystem and connect the antenna and RS485
communication bus. This is the actual alarmunit.
•
Connect the potential free relay output J20.1 and J20.2 to the alarmsystems’ input. This potential
free contact switches the alarmsystem on and off.
•
Connect a wire to J14.2 (GND) and lead it towards the potential free relay P-contact of the alarm-
status-relay. The ground level is switched by the alarmsystem to the decoder to indicate the alarm
is on or off.
•
Connect a wire to J16.1 (GND) and lead it towards the potential free relay NO-contact of the
alarm-status-relay. This wire is the inputsignal for the decoder from the alarmsystem to indicate
the alarm is switched on or off.
•
Connect a pull-up resistor (1k till 10k) between connector J16.1 and J14.3. This pull-up resistor is
connected to the decoders’ input.
•
Startup the Trovan Access Guard software and select the Alarm tabsheet under menuitem
General/General settings. Select the option ‘Pulse triggered’ and check the option ‘Turn the alarm
on/off via RS485 bus’.
•
Renumber all units allowed to switch the alarm on and off to a number in the range from 250 till
253. This does not include the decoder which is placed inside the alarmsystems’ housing.
•
Select Units and Settings/Settings per unit and select the alarmunit which is placed inside the
alarmsystems’ housing. Check the option ‘Alarmunit’.
•
Update the entire system.
