| 摘要 |
PURPOSE: To eliminate the influence of pulse interference from appearing on a communication line and to prevent a malfunction at a remote controller by using two current comparators and two interference suppressors. CONSTITUTION: A control unit 2 and a power source 3 are connected to a communication line 1. Testing equipments 4 and 5 are used for testing the state of the communication line 1. By using two current comparators 8 and 9 and two interference suppressors 11 and 12, the influence of pulse interference to appear on that communication line 1 during the operation of the communication line 1 is eliminated, and when the power source is turned on or the communication line 1 is short-circuited, the remote controller is prevented from being erroneously operated, while transient phenomena occur at the elements of the current comparators 8 and 9. Further, by using a logic circuit 13, self-tests are performed on the states for all the components of the remote controller. |
