| 摘要 |
PURPOSE:To attain proper communication in response to the communication environment and communication purpose, to improve the privacy and to suppress the disturbance to other communication by differentiating the setting value of a slave set retransmission number of time setting circuit or the like provided to each master set depending on the kind of the master set. CONSTITUTION:Master sets 3A-3c and slave sets 2A-2C are configurated identically, and a transmission circuit section 11 of each master set is provided with a slave set retransmission number setting circuit 14, a slave set light transmission direction angle setting circuit 15, and a slave set light transmission output setting circuit 16 or the like. Then the setting value of the circuits 14-16 is differentiated depending on relay master sets 3A, 3B and an ID master set 30. That is, in the master set 3C, the setting value of the circuits 14-16 is set so that the slave set 2C receiving a signal from the master set 3C makes transmission at a low output level with a narrow light transmission angle and a few repetitive transmission and the circuits 14-16 of the master sets 3A, 3B are set conversely. Thus, proper communication in response to the communication environment and the communication purpose is attained, the privacy call is enhanced and the disturbance on other communication is suppressed. |
