| 摘要 |
<p>PURPOSE:To provide a divided polling system of a handy terminal in which the high speed of a responding time can be attained, and the number of terminals can be largely increased, in the polling system of the handy terminal in the field of data communications or the like. CONSTITUTION:Plural handy terminals 4 are preliminarily divided into groups. At first, polling is operated to each group from a slave unit 2, and then polling is operated again to the responding group. That is, whether or not the answer from the transmission key input handy terminal 4 to the division polling is present is always monitored at a certain intervals by the slave unit 2, and when the answering is generated, the polling operation of each handy terminal 4 is operated only to each responding group, and data are transmitted by the slave unit side.</p> |
