PURPOSE: To simplify the wiring by providing a switching means generating a different signal to a master set to a 1st signal generating means in the different operation of a 1st switch and generating a signal to the master set to a 2nd signal generating means.
CONSTITUTION: When a 1st switch 50 is operated, a switching means 156 applies the operation in response to the operating state, a current flows to a 1st signal generating means 142 in response to the operating state and a 1st signal generating means 142 generates a different signal to a master set. Moreover, when a 2nd switch 52 is operated, a current flows to a 2nd signal generating means 146 and a signal to the master set is generated. Thus, only three wires interconnecting 1st-3rd terminals A, B, C are enough between each slave set and an exchange to generate plural signals to the master set.
OKADA SHIGERU
KATSUMURA TOSHIYUKI
NAKAMURA MITSUO
TARUYA AKIYOSHI
| JPS6143897A | 1986-03-03 |
| US4744103A | 1988-05-10 |