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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).

Another input on the SKE allows the connection of a timer or switch. The SKE allows users to be entered as normal users or 24-hour users. When the Time clock feature is implemented, users enrolled as 24 hour users are unaffected, but normal users will not be able to enter if the time clock input is activated. This is used for premises where one group of employees would only require entry during normal hours, while management users might require unlimited access.