This code lock with a modern design is used for securing access to doors, such as an office. It can store a maximum of 990 users with different codes (regular user codes) as well as 10 temporary guest codes or guest transponders (with a limitation on the number of uses). A relay output (1x changeover contact, max. 18 V/DC, 2 A) can be used to control a door opener or other devices, such as an alarm system.