SILENT KNIGHT 4821 Manuel d'installation Page 65

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Control Panel Description and Installation
150964 4-21
4.15.3 Zone Configuration
At any moment an input zone can be in one (and only one) of three states, depending on the
state of the hardware circuit connected to the zone input. The possible states are Open Circuit,
EOL Circuit, and Short Circuit. The value of the EOL resistor used on all input zones in the
4821/4820 system is 4.7k ohms (Silent Knight part number 7628). 4815 SmartSensor zones
are an exception because they require a 1.43k ohm resistor (Silent Knight model 4114).
Note: UL zones must be end-of-line supervised.
Figure 4-13 Zone States
Through programming, you determine how the zone will respond to the three possible states
when it is armed and disarmed. The possible system responses for all three states are Ready,
Not Ready, Trouble, or Alarm. See Section 4.15.4 for examples of typical zone wiring.
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