| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system capable of satisfying both of security performance and convenience.SOLUTION: The communication system includes a portable terminal, a sensor and a controller. The controller includes: a first communication section that performs radio communication with the portable terminal via a narrow-band radio communication channel; a second communication section that receives a piece of detection information detected by the sensor from the sensor; a warning mode specification section that specifies, as a warning mode, a warning state or a warning cancel state that the warning state is canceled depending on whether or not the portable terminal is positioned in a communication zone of the radio communication with the controller; and an alarm output section that outputs an alarm when the warning mode is the warning state, and when an abnormality detection state that the detection information includes a piece of information representing the abnormal state continues exceeding a predetermined time. |
