| 摘要 |
PURPOSE:To perform the test without requiring skill specially, by inputting a continuous signal corresponding to turning-on and off of a data signal separately from the data signal to test the circuit by using a simple display means of a low response speed. CONSTITUTION:A data signal (c) is supplied to a selective fixed terminal 11a of a switch 11 for line test, and a turning-on continuous signal (d) and a turning-off continuous signal (e) are supplied to selective fixed terminals 11b and 11c respectively. The movable terminal of this switch 11 is connected to an inverting circuit 12 and a constant current circuit 13 of a control place A, and the output of the circuit 12 is connected to a constant current circuit 14. This circuit 13 is operated by the turning-on continuous signal (d), and the circuit 14 is operated by the turning-off continuous signal (e), and prescribed voltages with 0V as references are generated at branch points 16a and 16b of a data communication line 15 from voltage generation sources E1 and E2. Signals from branch points 16a and 16b are received by a receiving circuit 21 of a place B to be controlled, and thus, a simple tester or the like is used to test the data signal. |
