| 摘要 |
PURPOSE: To provide a service call system which can increase the amount of information by displaying the identification numbers of many transmitters and furthermore improving the visibility if the number of transmitters that transmitted the radio signals is smaller than the number of display windows. CONSTITUTION: A display part 27 of a receiver 2 consists of an upper stage including four display windows 271 to 274 and a lower stage including four windows 275 to 278 respectively. Each of these display windows includes (16×16) pieces of light emitting diode in a matrix shape. When the identification numbers are displayed, the receiver 2 compares the number N of display windows with the number of identification numbers to be displayed. Then the receiver 2 selects a case where one identification number is displayed on each of windows 271 ..., a case where two identification numbers are displayed on each of windows 275 ... of the lower stage, or a case where two identification numbers are displayed on each one of windows 271 ... respectively. At the same time, the identification numbers to be displayed are rearranged so that they are set in the ascending order at and after the left end of the upper stage.
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