Age old questions abound which spark a constant series of debates. Which is better, Chevy or Ford, Coors or Budweiser, winter or summer?
Ask a couple of alarm guys which is better, hardwired or wireless and you are sure to receive some pretty strong opinions supporting one or the other. Battle Lines being drawn, let's try and get to the bottom of this sharply divided issue.
Hardwired alarm panels are less expensive than wireless panels, but they are harder to install. Keep this in mind if you are planning on doing the installation yourself. An average home installation with a hard-wired system takes about 12-16 hours. A typical wireless installation will take less than 4 hours.
Another consideration is that some types of construction lend themselves well to a hardwired installation, and others will require the use of wireless. Normally all commercial alarms are hardwired, and a large percentage of residential installations will utilize wireless.
Even if you purchase a wireless alarm panel, most installations will require that some of the devices are hardwired. These typically include the power transformer, the electrical ground wire, the telephone connections and any keypads/arming stations and audible alarms. There are some exceptions to this like some of the newer all-in-one units currently being offered which incorporate the base unit, arming station and audible alarm into a single unit that plugs into one of your existing phone jacks.
The main difference between a hardwired and a wireless alarm panel is how each one communicates with the protection devices connected to the system. A hardwired panel will require a wire to each "zone" or device on the system, while a wireless system utilizes a radio frequency to communicate with the "zones" or devices that are connected to it.
While a normal electrical circuit is a Parallel Circuit, a typical hard wired alarm circuit is a 2-wire normally closed loop with end of line supervision commonly referred to as a Series Circuit.
A Series Circuit allows electrical current to flow from the alarm panel, down one wire through the alarm initiating device and back to the alarm panel. When the current is interrupted, the panel will register a fault on the circuit/zone. End of Line (EOL) resistors are added to the circuit so that the alarm panel can supervise the condition of the zone for ground faults, electrical shorts and open or cut wires.
Multiple normally closed devices can be connected to a single zone by connecting the devices in series, with the EOL resistors installed on the last device in line. This way, the entire circuit is completely supervised from the panel to the last device in line.
When wireless alarm systems first appeared on the market, they were not the most reliable systems around. Most of them utilized non-supervised wireless transmitters to communicate to each of the field devices. A non-supervised wireless alarm transmitter would only send a signal "one way" to the alarm panel receiver when it was activated.
For example, when a door or window was opened, the transmitter would send a wireless signal. The alarm panel would receive the signal and activate the appropriate zone. The transmitter would not send a signal when the door or window was closed, so the receiver/zone had to reset itself after a few seconds. With a non-supervised wireless system, you could actually arm the system with a door or window wide open without even knowing it.
Most new alarm systems utilize a redundant bi-directional fully supervised wireless connection for two way communication between the transmitters and the alarm panel receiver. With fully supervised wireless, the alarm panel can tell you the real time status of a door or window. If a door is open, it will keep the zone faulted until the door is closed.
Most of the early wireless systems were very limited in their addressing schemes. They utilized dip switches with binary addressing (explained later) to differentiate between points on the system.
This was O.K. if your wireless system was installed and commissioned correctly, but what happened when your neighbor installed the same type of system? If the neighbors motion detector was addressed the same as your garage door, your alarm would go off every time they moved around their house. As you can imagine, this could cause some major problems that were very difficult to troubleshoot.
Modern wireless systems utilize serial numbers, binary house codes, or other proprietary technology to assure that only transmitters enrolled into your panel will be received by your alarm system. If you do your research and purchase a good reliable supervised alarm system, you should never need to worry about your neighbor's wireless transmitter setting off your alarm system.
Another problem with the older non-supervised systems is that you did not know when the batteries in the transmitters are low or need to be replaced. The only way to verify that they were working is to periodically test them.
Because, even the most sophisticated wireless alarm panels are useless if the transmitter batteries are dead, therefore supervised wireless panels are programmed to check in with each of the remote transmitters at least once every 24 hours. If your transmitter has a low battery, the keypad/arming station will immediately inform you of the trouble condition.
With any wireless security system you should always test the performance of your system regularly. The range of any wireless product can be affected by the environment and the structure in which it is installed. Additionally, the range can be adversely affected by environmental conditions, interference form electrical devices or even the orientation of the transmitter in relation to the receiver.
So who is the winner of this argument? Well, according to Underwriters Laboratory (U.L.), the most secure and reliable installation methods utilize hardwired installations with End of Line (EOL) 1 or 2-resistor supervision. In fact, U.L. approved installation standards for federal government and other high security installations require all zones of protection to be hardwired with complete 2-resistor line supervision.
Not to say that wireless systems are an inferior product. In fact the fully supervised systems offer excellent protection that is perfectly suitable for 90% of residential installations.
If you are considering a wireless alarm system, be warned, there are still systems being sold and installed today that are non-supervised, so make sure that any system you are considering offers complete wireless supervision.
If you opt for a hard-wired alarm system, make absolutely sure that the system is installed with the supervisory resistors at the end of the line. To make installation faster and simpler, some installers will place the resistors in the alarm panel rather than at the end of the line.
While this method provides supervision of the zone for ground faults, it does not provide protection for a direct short or worse yet, someone splicing into the wire and shorting them together which will essentially close the loop so the panel will not see the zone open or close.
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Consumers of home and business security alarm systems have many resources at their disposal, to search out and purchase security systems from quality alarm dealers. Access to the Internet has provided a wealth of information, and has proved to be a great resource for consumer advocates, to educate potential consumers.
Where does the quality conscious alarm dealer go to learn how to meet the demanding wants and needs of these now educated consumers? In the past they would rely on the knowledge base of their most informed employees or mimic the processes of a competitor that seemed to be doing well.
The Experts Know! Alarms, has been representing consumers in their search for previously unavailable consumer education. In the process, quality alarm dealers have thrived and rejoiced in the benefits of dealing with an educated consumer who appreciates a job done properly.
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Working with a consultant that specializes in the field of electronic security will provide the growth you have been looking for. Even startup alarm companies now have a resource for the building blocks necessary to compete in today’s security dealer market.
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