A keypad reader is typically a set of numeric buttons (0 - 9) and a couple of symbols (* #). A keypad is one of the most commonly used input devices in microprocessor applications. While the look of the keypad has not evolved significantly since its invention in the 1960s, its functionality has expanded widely.
Employees can be given a PIN number that specifically identifies them in entrance records. Each door lock can be a stand-alone option, or they can be interconnected to connect to the monitoring system. If employees are connected, you will be able to monitor exactly who and when they use their code. This option usually works best when employees have access to only a few entrance doors.
In a standard keypad wired as an X-Y switch matrix, normally-open switches connect a row to a column when pressed. If a keypad has 12 keys, it is wired as 3 columns by 4 rows (single-gang) or 2 columns by 6 rows (mullion). A 16 button keypad has 4 columns by 4 rows.
Keypad readers can typically support different types of PINs and between 1 and 6 digit codes. Standalone PIN pads typically come as a flush mount, single-gang and mullion design which is easily installed onto drywall or single-gang electrical boxes. When the master code is entered, PIN codes can be changed.