WIRELESS DATA TRANSMISSION SYSTEM

PROBLEM TO BE SOLVED: To enable measuring field strength in wireless communication between a wireless master device and wireless handsets, without connection terminals only for measuring. SOLUTION: A wireless communications unit 11 outputs received signal strength information, after measuring the field intensity of a received signal. An input-output I/O terminal 15 and the wireless communication unit 11 for connecting terminal devices are connected, and a switching section 19 is laid so that direct output can be done out of the I/O terminal 15. When the field strength is measured, the switching section 19 gets a signal from a microcomputer 12 and separates a meter interface section 16, from a state with the section 16 connected with the I/O terminal 15, in order to connect the I/O terminal 15 with the wireless communications unit 11. COPYRIGHT: (C)2005,JPO&NCIPI