| 摘要 |
<p>PURPOSE:To prevent crosstalk by setting a data processing unit having the largest number of times of data transmission/reception to a main station so as to apply the entire data transmission control. CONSTITUTION:A CPU 1 of a data processing unit controls a transmission section 1, a reception section 9 and antenna switches 10, 11 and processes a data. The CPU 1 of each station counts the number of times of data tran smission/reception of all data processing unit sincluding its own station and when the number of times of transmission/reception of its own station is largest, its own station is set as a master station and in other cases, its own station is selected as a slave station. Since the correspondence of all the stations is received by each data processing unit, the discrimination of which station is to be the master station is impartial to each station. A station to be the master station controls the entire data transmission and stations being slave stations make data transmission/reception after they are permitted by the master station. Then no crosstalk takes place even when the same frequency is in use. Further, the next master station is selected easily if the master station is in failure.</p> |
