| 摘要 |
PURPOSE:To prevent mistakes in number setting, by storing a dial number set to a set of number set switches, and making small the dial set device with less number of components, through the provision of the switches from which the set dial number can be observed visually. CONSTITUTION:A digit designating signal (4-bit) for dial number of called party is inputted from a digit designation signal terminal 1 and it is fed to a decoder 4 and an RAM5. The decoder 4 converts the signal digit signal in BCD code to a specified signal, the signal is fed to a number set switch 6 to set the dial number. The dial number set with this switch 6 is converted into the BCD code with an encoder 7 and it is fed to the RAM5. Further, the signal from a called party designating signal terminal 2 and switching signals for write-in and readout from a mode switching terminal 3 are fed to the RAM5. Moreover, the dial number is stored in the RAM5 and displayed on a display device 9 via a latch circuit 8, and it is transmitted to a dial signal transmission circuit 10 to prevent the mistake of number setting. |
