| 摘要 |
PURPOSE:To attain low cost and miniaturization by using a single detection relay only to detect a response of an opposite party and operation of an emergency switch for circuit forming. CONSTITUTION:A control section CNT starts the control operation by the ON of a coin detection contact CCL and the ON state of a hook switch HS<1> in response to the deposition of a coin after hook-off. When the opposite party responds after dialing, a detection relay ANS is operated, held and the information representing the response is transmitted to the control section CNT. In operating an emergency switch ES after emergency talking, the detection relay ANS holds the operation and even if the detection contact CCL is opened, the talking is enabled by a contact ans<1> and the information representing the operation of the emergency switch ES by a contact ans<3> is given to the control section CNT. |
