| 摘要 |
PURPOSE:To input a key from the 2nd keying port prior to the 1st keying port at an emergency time by providing the titled device with the 2nd keying port in addition to the 1st one and inputting keys also from the 2nd keying port. CONSTITUTION:In the normal state, a NAND circuit 5 is ON and the 1st keying port 1 is always scanned by clock signals R, C. If a ten-key is depressed under said state, respective signals corresponding to the depressed keys are outputted from the keying port and dial signals corresponding to the output signals are outputted from the 1st keying part 2. When a keys arranged on the 2nd keying port 3 is depressed, a signal corresponding to the key is outputted and a prescribed signal is outputted from the 2nd keying part, so that the NAND circuit 5 is turned off and the signal of the 2nd keying part 4 is inputted to the 1st keying part 2. Consequently, a dial signal corresponding to the output of the 2nd keying part 4 is outputted from the 1st keying part 2. |
