| 摘要 |
A radio frequency communication system comprises a control module ( 1 ) and communications modules ( 2, 3 ) the modules communicating with each other by means of radio frequency signals. Initially, the control module ( 1 ) is allocated address number ( 0 ) and the communications modules ( 2, 3 ) are allocated address numbers ( 1 ) and ( 2 ) respectively. The system shown in FIG. ( 1 ) is set up as a loop arrangement, in which signals are transmitted from communications module ( 3 ) directly to the control module ( 1 ), so that the control module is also allocated address number ( 3 ). When a new module ( 4 ) is to be inserted into the system at the location shown in FIG. ( 1 ), the new module ( 4 ) is caused to emit a first message, in a set up mode, at low, medium and high power levels, as shown in FIG. ( 2 ). The message transmitted by the module ( 4 ) at each power level contains data identifying whether it has been transmitted at high, medium or low power level.
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