| 摘要 |
A vehicle security system, comprises a coded key (10), a reader (12) for reading the code of the key (10) and generating an encoded electrical signal, a data transfer bus (14) connected to the reader, and a plurality of units (16, 18, 20) connected to the data transfer bus (14) and rendered operative only upon receipt of a predetermined valid code from the reader. Each unit (16, 18, 20) is arranged upon receiving an invalid code to transmit an error code over the data transfer bus (14) to the reader (12) or to other units connected to the bus, and upon detection of an error code on the bus from at least selected ones of the units (16, 18, 20), other units (16, 18, 20) connected to the bus are rendered inoperative even if the latter units had received valid codes. |
