14
DS1061-036A
The following diagram can be useful to find the minimum cable section that is necessary.
WARNING
: The diagram is used for a preliminary estimation; for an accurate calculation, use the
formula described above. However, it is necessary to verify with a voltmeter, that the voltage measured on
terminals of each device is not lower than the power supply voltage provided by the control panel or by the
additional power supply unit (0.7 Vdc).
Using an alarm system cable with a section of 0.22mm
2
for the serial line (LA LB) and 0.5mm
2
for power
supply (+, –), the maximum distance of peripherals is:
•
1061/334-/335 readers: 200 m
•
1061/434-/435 readers: 100 m
•
1061/025 keypad:
50 m
2.4.2
Data bus cable
For the bus is needed a 4-wire cable, and it is suggested to use a shielded cable for alarm system 4 x 0.22 mm
2
+
2 x 0.5 mm
2
, in order to have available the wire pair for readers tampers contacts.
Bus maximum length can not exceed 500 m.
2.4.3 Audio
cable
For the audio line, use a twisted pair. The audio line length can not exceed 100 m.
2.4.4
Coexistence with mains cables
Bus cable, audio bus and detectors cables can not be laid in conduits or tubes used for mains cables.
