| 摘要 |
PURPOSE:To display lines more than the number of line display means so as to prevent misoperation by switching the group of the line display means with the operation of a line switching means. CONSTITUTION:The display request button 309 of a mobile machine 111 is depressed and a radio channel connection is requested to a fixed machine. The fixed machine transmits use state data of a line wire to the mobile machine 111. A control part 305 discriminates it and displays a line wire key 314 corresponding to a line use state so as to notice it. When a line switch key 312 is depressed, the control part of the fixed machine detects it, judges the line wire group which is displayed at present, lights line switch LED 313, displays that the line wire key 314 is switched, transmits line wire use state data on the line and lights the line wire key 314. Namely, the control part 305 sequentially selects any state of the line wire group and displays it by the line wire key 314 at every operation of the line switch key 312.
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