Monthly Archives: July 2015

Need to control access to your premises?

Let’s have a look to the Linear AM3 Plus Access control panel.

It is capable of controlling up to 4 doors, expandable up to 32 doors, up to 10.000 users and 20.000 entry codes . It has four built-in general purpose (Form “C”) relays. Anyone can be used for the control relay and the others for auxiliary control functions, including activation of safety edge reverse, or alarm shunting. In addition, the AM3Plus supports request to exit and door status monitoring for each relay. The AM3Plus is supplied in a lockable plastic enclosure designed for indoor use. For outdoor mounting, an optional NEMA 3R enclosure (Model CAB-3) is available. There are two programming choices: Use any PC at any location to access programming using Linear’s AXNET that is built into the controller. Or use a dedicated PC to access programming using Linear’s AccessBase2000 software. Both choices allow multiple unit connectivity.
Other features include:

Front Panel: two 7-segment LED displays for system configuration, status and troubleshooting
PBUS: two sets for connecting up to six proprietary addressable devices
Wiegand: two sets of Wiegand inputs for connecting 26, 30, or 31 bit Wiegand devices; each Wiegand input supports two reader LED indicators.
Request To Exit: four normally open inputs; each input assigned to specific relay

It is 12/24 VAC or VDC; 16 VAC transformer is included, the operating temperature is -22° to +149°F, dimensions are: 11.5 in L x 4 in W x 12.5 in H (292 x 102 x 318 mm), it comes with Built-in 24-hour clock/calendar with battery back-up and daylight savings adjustment.

What are Driveway Loops?

Driveway loops are an integral part of most automatic gate systems. They are used to command the gate to open or prevent it from closing on a vehicle in the path of the gate. They can also be used for peripheral activities such as turning on driveway lights or signaling a residence that a vehicle has arrived.

Exit Loop – Typically placed 60 feet or more away from a gate, but can be placed as little as 4 feet away from the gate. When tripped, they cause the gate to open.

Safety Loops (also called Reverse Loops) – Typically placed close to the gate (4 or 5 feet away) on the inside and outside. If tripped when gate is closing, will cause the gate to re-open. For instance, if a gate is closing and a car passes over a safety loop.

Shadow Loops (also called Center Loops) – Used for large swinging gates when the arc of a gate is longer than a typical car. Placed under the swinging portion of the gate. The shadow loop acts like a safety loop but is deactivated when the gate begins to close to prevent the metal in the gate from tripping a re-open occurrence.

Entry Loops – Placed on the outside of the gate, entry loops are used to command the gate to open in situations where security is not a concern. For instance, when a gate is only used as a barrier to keep deer out. Entry loops can also be used to turn on driveway lights or send a signal to a house that a car has arrived.

So, how do driveway loops work? When direct current (DC) passes through a wire, an electromagnetic field (EMF) is created around the wire. When the DC current is removed, the electromagnetic field similarly disappears. With driveway sensing loops, a loop detector is used. The loop detector is a small device that plugs into the main circuit board of the gate operator. The loop detector creates an alternating current (AC), which changes electrical current direction at a predefined frequency. When the current changes direction in the loop, the magnetic field that is collapsing pushes against the new field that is being created. This is a form of resistance called inductance, which is measured in henrys. Many different factors affect the inductance of a loop including the wire size, number of loop windings, distance of loop from loop detector.

The loop detector, the brains of the loop sensing device, sets the amount of AC current flowing through the loop, as well as detects when a metal object – over the loops electromagnetic field – absorbs some of the EMF that is collapsing. When a metal object absorbs some of the collapsing EMF, it lowers the resistance in the wire of the loop which causes in increase in the electrical current flow in the wire which is detected by the loop detector.

A common misconception with regards to sensing loops is that the metal that is detected must contain magnetic properties, such as steel that contains iron. This is untrue, as aluminum is also detected by sensing loops. The reason is that aluminum is electrically conductive and as such has and effect on the inductance in the loop. Another misconception is that the loops are pressure sensors, sensing the weight of a vehicle. This also is untrue.

SS-TS2000 Keypad

The SS-TS2000 keypad is not just your regular keypad, it is a 26 bit Wiegand device with proximity reading capabilities and completely water proof.

This standalone unit is housed in a strong Zinc alloy electroplated case and the internal electronic components are fully potted so the units is waterproof to IP68 standards.
It supports up to 2000 users in either proximity card, fob or
4 digit pin format.

Take a look at these impressive features:

• Waterproof, conforms to IP68
• Strong Zinc Alloy Electroplated anti-vandal case
• Full programming from the keypad
• 2000 uses, supports Card, PIN, Card + PIN
• Can be used as a stand alone keypad
• Back-light keys
• Wiegand 26 output for connection to a controller
• Adjustable Door Output time, Alarm time, Door Open time
• Very low power consumption (30mA)
• Fast operating speed, <20ms with 2000 users • Lock output current short circuit protection • Easy to install and program • Built in light dependent resistor (LDR) for anti tamper • Built in buzzer • Red, Yellow and Green LEDS display the working status When choosing a good reliable keypad consider the SS-TS2000 and ask our product specialist if it right for your application at 1-800-730-8382.