| 摘要 |
PROBLEM TO BE SOLVED: To identify a call kind without installing a new button for a different kind of a call by providing display means corresponding to the classification of a landing call. SOLUTION: When a general call is registered, a relay XA is operated, and a circuit of P-AT1-AT2-response lamp LA of existing buttonATE-ATE-relay XA-N is formed so that the response lamp LA of the existing button is lighted. On the other hand, when a special call is registered, a relay XB is operated, and a circuit of PAT-1-AT2-response lamp LA of existing lamp -AT3-AT4- control resistance R- relay XB-N is formed so that the response lamp LA of the existing button is lighted. As compared with the register of a general call, the lamp becomes darker because the control resistance R is connected in series to the response lamp LA. Thus, it is possible to discriminate the classification of a call according to the lighting condition of the response lamp LA of the existing button in such a manner that if bright, it is a general call, and if dark, it is a special call. |
