wiring-How to

[adron]

I have a dsc wired alarm system.... I need to know how to wire the system, I don't understand.... Please help!!!!

[mdshunk]

Your question is much too vague. Do you not understand how to physically run wires in your house? Do you not understand which components get connected to what? Do you not have installation instructions for the system? Do not know what type and size of wire to use? Do you not know how many conductors need run to the various devices? Do you not understand how the wires physically connect to the terminals on the devices? Post back. My psychic powers are fading off as time goes by... :D

[adron]

I have a DSC Power 832 PC5010 system version 2. I don't understand normally closed, end of line, and double end of line loops. I also don't understand the placement of the resistors. Also can you explain the basic concept of alarm wiring at the point of having all the wires pulled to control panel.

[mdshunk]

I don't understand normally closed
Normally closed (and normally open) are the types of contacts that your sensors (glass break, motion sensors, etc.) have on them. If the zone sensor is normally closed, then the circuit path is complete through the device when it is in it's normal state (not tampered with). If the zone sensor is normally open, then the circuit path is broken when the device is in it's normal state.

...single end of lineEnd of line denoted where you put your resistors. If your alarm zone sensors are a combination of normally open and normally closed devices, then you need to wire the zones with end of line resistors. If the device is normally open, then you place the resistor across the sensor's terminals (in parallel). If the zone sensor is normally closed, then you place the resistor in series with ONE of the wires on the zone sensor.

...and double end of line loops.
Double end of line loops (or properly double end of line resistors) are used with normally closed zone sensors only. This permits the control module to tell the difference between an actual alarm condition and a zone fault (wiring trouble). To use this wiring method, you place one resistor across the zone sensor contacts (in parallel), and one resistor in series with one wire of the zone sensor.

I also don't understand the placement of the resistors.
For your DSC system, I believe the resistors used are the 5600Ω variety. The ones placed across the contacts (in parallel) can be placed across the contacts either at the zone sensor, or across it's corresponding contacts in the control panel. Your choice. The same goes with the resistor in series with one wire. You can place it either in series with one wire at the control panel, or at the zone sensor.

Remember, when you pick which wiring method you're going to use (normally closed, single end of line resistor, or double end of line resistor), you need to program your system to tell it which wiring method you picked. If all this resistor business confuses you, you might want to just pick the straight normally closed wiring method (if you can), and forget about all the resistor jazz.

[adron]

Thanks......This is a great help. Question what circumstances will prevent me from using straight normally closed wiring method.

[mdshunk]

Well, if you have any zone sensors that are only normally open, then you would have to use the single end of line resistor method. Normally closed is the most typical type of zone sensor device. Some devices, such as many motion sensors, have three terminals. One for common, one for normally open, and one for normally closed. To wire this device for normally closed, you hook one wire on normally closed, and the other wire on common. I believe that if you are hooking any fire type devices to this system, you need to wire with one of the resistor methods.