| 摘要 |
PROBLEM TO BE SOLVED: To surely evade the collision of slave station data transmission by imparting an idle number to idle signals from a master station, transmitting them, performing division into groups decided for each number of times of the transmission of data by a slave station and deciding transmission delay from a group number, an idle signal number and the number of times of the transmission of the data in the slave station. SOLUTION: In the case of permitting the transmission of the slave station from the master station 0, the idle signals IS are transmitted. The slave stations 1-N with transmission data receive the idle signals IS from the master station 0 in a radio part, modulate them in a modem, and at the time of recognizing that they are the idle signals, read one of transmission delay values written in a transmission delay value table and detect whether or not a radio carrier transmitted by the other slave station is present before passing the transmission delay value. When the radio carrier from the other slave station is not detected, the data are sent out and an affirmative response for indicating that the data are received from the master station is received. |
