| 摘要 |
PROBLEM TO BE SOLVED: To reduce battery drain in a storage period before installation and in an unconnected state to a telephone line in a radio terminal network control device and a radio slave unit which are operated by batteries, and a telemeter system including them. SOLUTION: When a line detecting part 11 detects the unconnected state to the telephone line 02, a terminal network control part 10 transmits the stop of radiocommunication to the previously associated radio slave unit 04 stored in a storage part 21, via a radio transmission part 19 and an antenna 20. After transmission, the terminal network control part 10 stops the detection of a carrier sense detecting part 18 for detecting the presence of radio transmission from the radio slave unit 04, and stops input from the radio receiving circuit 17. The terminal network control part 10 thus stops functions on transmission/reception to/from the radio slave unit 04 to reduce the drain of the battery 14. COPYRIGHT: (C)2009,JPO&INPIT |
