Autonomous code lock that combines the functions of a digital access control keypad and a card reader with a proximity tag. It works with electromagnetic locks and access control systems and controls other electrical or alarm devices. Features include a relay output, a 125 kHz reader for proximity cards and key fobs, card and PIN operation, 10,000 possible protected combinations, and 1,000 user PIN codes. The code length can range from 4 to 8 digits, and the non-volatile EPROM memory stores codes and parameters in the event of a power failure. It features a backlit keypad, a vandal-proof housing (IP44), surface mounting, a keypad status indicator with LED diodes, a two-stage key protection, a door opening sensor, and all settings are made via the keypad.