| 摘要 |
PROBLEM TO BE SOLVED: To automatically correspond to a terminal even when the installed location of the terminal is changed by switching a four-wire receiving line of a terminal interface part to connect a signal transmitter, switching a four- wire transmitting line to connect a level meter and measuring the return loss of a signal of a four-wire-two-wire conversion. SOLUTION: A signal transmitter 7 is connected to a four-wire receiving line of a terminal interface part 2 that corresponds to a 1st vehicle, a level meter 6 is simultaneously connected to a four-wire transmitting line by the control of S1 of a terminal installing vehicle detecting part 5 and return loss is measured. Because a terminal 4 is not installed on the 1st vehicle, a return loss level of a signal is larger than a threshold, which makes it clear that the terminal 4 is not connected. Next, S2 is controlled to send a signal to a terminal interface part 2 that corresponds to a 2nd vehicle in the same way and return loss is measured. Because a terminal 4 is connected to the 2nd vehicle, the return loss level is small. Similarly, entire vehicles are automatically detected without errors in a short time. |
