| 摘要 |
<p>PURPOSE:To contrive to reduce the cost of the entire equipment by providing a reference clock output means and a synchronizing signal sending means to a reference interface unit and providing a clock pulse output means and a pulse count means to each of plural interface units so as to eliminate the oscillator with high accuracy. CONSTITUTION:A synchronizing signal outputted for each synchronizing interval TO is sent from the reference interface unit 1a. On the other hand, an oscillator outputting a clock pulse and a prescaler set to a prescribed frequency division ratio are built in other interface units 1b, 1c-1n. In receiving a synchronizing signal from the reference interface unit la, the pulse number of its own clock pulses sent within the synchronizing interval TO of the synchronizing signal are counted. When the count counted within the interval TO is (m), then the synchronizing timing is set based on the count (m). Thus, transmission/reception is attained between interface units while taking sure synchronization.</p> |
