| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a decrease in communication speed in a plurality of communication terminals which perform wireless communication with a controller to perform communication stably. <P>SOLUTION: Handy terminals 20A, 20B, 20C which perform wireless communication with a controller 10 comprise: a wireless communication module which performs wireless transmission of data to the controller 10, and retries the data transmission when data transmission to the controller fails; and a control part which gives a wireless transmission instruction of the data to the wireless communication module, measures transmission processing time from the wireless transmission instruction of the data to success of the wireless transmission, calculates carrier time that is actual data transmission time of the measured transmission processing time, calculates an occupancy showing a ratio of the calculated carrier time in predetermined measurement time, and controls wireless communication of the wireless communication module so that the calculated occupancy can be a pre-set upper limit or less. <P>COPYRIGHT: (C)2013,JPO&INPIT |
