| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio data communication system capable of allowing a user to do an acceptance confirmation by only ear for matching operation using radio waves in an installation work even if a conventional low-speed radio communication apparatus and a high-speed radio communication apparatus are coexisting. <P>SOLUTION: A radio data communication system includes: a center side device; a radio master unit connected to the center side device via a communication line; and a plurality of radio slave units for communicating with the radio master unit. The slave units perform data communication with the center side device through the master unit. In a system that performs FSK communication at a modulation speed equal to or more than audible sound frequency bandwidth, the master and the slave units contain a modulation signal of audible sound frequency bandwidth in at least one telegraphic message when executing a matching operation by means of radio communication between the master and the slave units. <P>COPYRIGHT: (C)2013,JPO&INPIT |
