Night Light Function: When this function is selected, the act of touching any key will operate the programmable relay for five seconds to turn on a lamp or video camera.
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Essex SKE Series
A good access control solution for single-door systems is the Essex SKE Series. These keypads come in 3 X 4 button matrix, which is the telephone-style single gang format, or the 2 X 6 narrow stile version, good for storefronts or door frames where the slim shape is more desirable. Both versions share just about all the same features except illumination.
The SKE models are described as self-contained access control keypads because they contain several operating features which allow you to provide a lot of extra features to your installation at a reasonable price point.
The keypads are Piezo, which means they are vandal resistant, weatherproof and will last since there are no moving parts. This ensures solid performance in any environment (heat, rain, snow, ice -up to 3/8”, -40°C to +70°C). A choice of architectural finishes is available.
The SKE has a 2A relay on board which is ample to operate most electric locking devices. It can be configured for 5 Volts DC or 12-24VDC. A linear or switching power supply may be used.
The SKE-26 is backed by a limited lifetime warranty.
The SKE is programmed from the keypad and will allow up to 502 users, with PINs from 3 to 8 digits. I recommend an 8-digit master programming code and 4-digit user codes.
Since the default Master Programming Code is by default 1-2-3, it is almost inevitable that you will wish to change this to a more secure number.
You will most likely want to create at least one user code. There are a number of parameters to consider when creating a user code.
Three outputs are available. The main output is the Form “C” (SPDT) (Com; Normally-Open; Normally-Closed) Dry contact which activates for a programmable length of time when a valid code is entered into the keypad.
The other two outputs (referred to as Output A and Output B) are referred to as open collector outputs rated a 250mA which are typically connected to relays.
So the SKE can be used to control as many as three doors, or three devices, or a door and another device, etc. Most projects will be comprised of a keypad and a door lock, but having the additional capabilities is a lifesaver where custom controlling is required. For example, it can also be used to control a garage door or electric gate. Two 1/4A grounding outputs are available which can drive a relay (separate relays required) to open a second door, trigger a CCTV or doorbell or control an auxiliary device.
Having those additional outputs can also give the technician a second chance. On a recent emergency service call, we replaced an old worn out keypad on the employee entrance to a department store which had failed on Friday afternoon, with no other entrance available to the employees other than the main doors which were inside the shopping mall.
My helper inadvertently miswired the main relay output of the new SKE 34S we were providing. We didn’t have another SKE 34 unit in stock, so I reprogrammed the unit so the code would activate one of the spare outputs, and added an inexpensive slave relay to save the day.
Two lessons learned: the SKE 34 has workarounds and keep a spare SKE 34 on hand.
An external connection is provided for a DPS (door position sensor) which may be the most useful enhancement which can be made to the basic access control.
When the DPS is used, the relay which controls the door lock will reset immediately after an access or REX is completed, rather than allow the door relay to remain energized for the number of seconds it is programmed to energize. This helps deter piggy-backing through the controlled door. Additionally, if a sounder is connected, the SKE will cause an alert if the controlled door is allowed to remain open too long (propped), or opened without a valid code or REX trigger first (forced).