| 摘要 |
A security system is disclosed which is suitable for use in a vehicle. The security system comprises a passive entry and passive re-mobilisation system in which a security controller (10) transmits a command signal LCs to a remote transponder (14), which replies with an LF response signal LRs. If an LF response signal is not received in response to the transmission of a command signal LCs, the security controller (14) re-transmits the command signal, again as an LF command signal LCs. On determining that a command signal is a re-transmitted command signal, the remote transponder (14) re-transmits the response signal as an UHF response signal URs. |
