| 摘要 |
A method of communicating data from a transmitter 12 to receiver 26 is provided. The method includes providing the transmitter 12 with a counter 16 and data to be communicated, and periodically adjusting a count of the counter 16 to generate modified data which is then transmitted. Typically, the count is incremented each time a signal is transmitted by the transmitter 12 which is typically in the form of an electronic tag. The invention thus extends to a transmitter 12 which includes storage means 14 for storing unique identification data for identifying the tag, and a counter 16 having a current count which is periodically adjusted in use. Further, the invention extends to a monitoring system 10 which includes a plurality of transmitters 12 as herein before described and a receiver 26 including analysis means 30 for analysing the transmitted signal 15. |
