| 摘要 |
<p>In a method of controlling access to an area accessible by persons, particularly to a space (2) closed by a door (1), at least two communications units (10, 20) for transmitting and receiving an identification code and an access code are provided. In the method, the identification code is transmitted at a predetermined first transmission pow er from at least one first communications unit (10) to at least one second communications uni t (20). The second communications unit (20) checks the identification code and transmits an acknowledgement code at a second transmission power, which is lower than the first transmission power, from the second communications unit (20) to the first communications unit (10) if the check of the identification code was successful. The first communications unit (10) transmits an access code to the second communications unit (20). After a successful check of the access code by the second communications unit (20) t he access is freed.</p> |
