| 摘要 |
PURPOSE:To enable to confirm the push botton operation, by using the display element with the 7 element as the display for the numeric push button and by performing the display with the lamps as the display element for other added push buttons, in the telephone set with display for the terminal unit for simple data communication systems or the like. CONSTITUTION:In the telephone set performing display in response to the input signal through the reception of the information processed with the central unit with the delivery of simple data by using a push button dial unit after the connection to the central unit via the telephone exchanger with the pushbutton dial 2 of the telephone set circuit, the telephone set 1 is provided with the pushbutton dial 2 and the additional pushbutton 3. Further, the numeral display section 9 connected to the control section 8 displayed in response to the numerals of the push button dial 5 and the lamp display 11 connected to the latch circuit 10 displayed in response to the pushbuttons other than for the numerals are provided, and the pushbutton dial 5 is connected to the matrix of the low frequency contacts l1 to l4 and the high frequency contacts h1 to h4, and the surge absorbing diode D absorbing the surge voltage caused at the relay restoration is provided. |
