| 摘要 |
PURPOSE:To simplify and clarify display so that the states of a trunk line can be displayed by respective colors without expanding a display space by alternately lighting 1st and 2nd colors at a prescribed rapid cycle to display a 3rd color. CONSTITUTION:A display lamp 8 is provided with the same number of two-color lamps 9 as the number of trunk lines to be connected to a master equipment A. The two-color lamp 9 is provided with two LEDs in its single element and the 1st color (red e.g.) or 2nd color (green e.g.) is emitted by selectively supplying current to respective terminals R, G. A lamp driving circuit 10 lights up the display lamp 8 based on a control by a CPU 4. Namely, when current is supplied alternately to the terminals R, G at a prescribed rapid cycle, the 3rd color (orange in this example) based upon the mixture of the 1st and 2nd colors can be emitted and displayed.
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