20
Morley-IAS
996-203-000-2, Rev. 02
3.4.9 Digital Inputs
-
The DX Connexion Series Fire Alarm Control
Panels have two power-limited, supervised
digital input circuits.
-
The circuits can be used as switch input circuits
with monitoring for open or short circuit
conditions.
-
Shielded cable should be used for all digital
input circuits wired to switches external to the
panel.
-
Refer to
Appendix 1 Specifications
for a list
of recommended cables.
-
Connect the screen drain wire to the nearest
earthing point in the enclosure – see loop-
wiring section for example.
-
Refer to
Section 5.3.6 Local Inputs
for details
of programming these inputs.
-
The normal EOL resistor is 6.8kOhms ½W.
Connect the supplied resistor directly across
input terminals for unused inputs.
-
The diagram opposite shows the arrangement
for wiring an input with monitoring.
Note:
The switch / relay output should be wired
as ‘normally closed’ for inactive inputs. The
switch should open to activate the input.
Figure 19 - Digital Input Circuit Connections
Figure 20- Monitored Circuit Input
3.4.10
RS485 Peripheral Link
EN54-2: 8.8
Integrity of
transmission paths:
The peripheral
network does not
provide the the
required transmission
path integrity.
EN54
!
-
The DX Connexion Series Fire Alarm Control Panels can
be connected to a range of serial interface devices via the
RS485 peripheral loop.
-
The RS485 peripheral communications link should be
installed in a ‘daisy chain’ type wiring arrangement.
-
Each supervised peripheral device must be given an
address. The address can be in the range 1 – 126. Refer to
the Installation Guide for each peripheral type for details on
the allowed address range.
-
The maximum number of physical devices that can be
connected to the peripheral loop is 31. This applies only to
occasions where passive repeaters are employed at address
‘0’ – the maximum number of addressed (monitored)
repeaters being 16.
-
The panel supports the following peripheral devices:
Model Number
Device Description
Supervised
ZXr-A
Active Remote Annunciator (Repeater)
YES
ZXr-P
Passive Remote Annunciator (Repeater)
NO
1
Table 3 - List of Compatible Peripheral Devices
1
The ZXr-P may optionally be supervised at the FACP – set the address in the range ‘1-126’ instead of the default ‘0’.
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