| 摘要 |
PURPOSE:To obtain a loop transmission control system whose reception sensitivity is adjustable in an installed state as it is, by setting up an adjustment mode program in the control software of each processor. CONSTITUTION:When the reception sensitivity is adjusted, all control stations 1-3 are placed in adjustment mode; for example, the control station 1 is placed in transmission mode and the control stations 2 and 3 are placed in reception mode. In this state, the processor MC of the control station 1 operates repeatedly in the order of steps (1), (2), (3), (4), (5), and (6) or (7) shown in a figure and the control stations 2 and 3 operate repeatedly in the order of the steps (1), (2), (4), (5), and (6) or (7). Then, an RV for sensitivity adjustment is adjusted firstly so that the reception adjustment is made in the order of the control stations 3 and 1. The manual adjusting method is described as above, but automatic sensitivity adjustment is available by the output of a coincidence detecting means. |
