| Caddx NetworX NX-6 Alarm Control |
| Abletronics has been selling alarm components for many years to the customer that wants to install their own alarm system. Our most popular alarm panel manufactured by Caddx, the CA8980, has been redesigned and the NetworX Series has evolved. The most economical is the six-zone Caddx NX-6 which has all the features found in the most expensive equipment at a fraction of the price. It's ability for expansion is fantastic. Not only can additional hard-wire zones be added but also wireless zones, auxiliary outputs, BSR X-10 Capability and listen-in audio modules are available. An optional LCD keypad is also available. The Caddx NX-6 as shown below (Gel-cel battery, alarm speaker and peripheral components are extra) sells for only $149.95. | |||||||||
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| A close view of the terminals of the Caddx NX-6. Note the EOL's (End of line resistors) that are connected to each of the six zone terminals. These are normally at the end of the alarm loop circuit but are Temporarily connected here to test the operation of the alarm panel. | |||||||||
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The Caddx NX-6 on the bench being tested. The only item not shown is the plug-in wall transformer that supplies power to the unit and keeps the 12VDC 7A/hr battery constantly float charged. The battery and 25 watt 8 ohm outdoor horn are purchased separately. |
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About EOL (End of Line Resistors)
An important requirement of a professional alarm panel is to make a constant integrity check on all of the zones to ensure that all of the items, in this case contacts are being monitored.. The use of closed circuits (Contact makes continuity when magnet is next to the contact) ensures that a current supplied by the panel flows through all of the contacts on a given zone and back to the panel. To make sure that the last contact is being monitored, a resistor (EOL) of a given value is intentionally placed in series at the last contact. The panel is designed to expect to see this value as a good zone condition. An open or short is interpreted as a violation of the zone. |
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