| 摘要 |
PURPOSE:To simplify the constitution of each interphone device and reduce the device at its size, by sending state data together with the sequential address from an exchange to the interphone device. CONSTITUTION:A clock signal from a clock line 2 is counted up by a counter 4. At that time, a signal is outputted at a high level from a terminal OUT1 and the clock is inputted to a shift registr 5 through a gate 10, so that the register 5 inputs data from a data line 1. After completing the input of the first 8 bits, the terminal OUT1 is turned to the ''L'' level and address data are stored in the register 5. When the address data conicide with the address from a number setting switch 7, a signal with the ''H'' level is outputted from the terminal OUT of a comparator 6 and the data of the 9th bit and after are inputted and stored to/in the shift register 8. The contents of the register 8 are successively displayed on an LED13 by a driver 9. |
