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    • 5. 发明专利
    • COMMUNICATION SYSTEM
    • JP2000004303A
    • 2000-01-07
    • JP16959698
    • 1998-06-17
    • TOKYO GAS CO LTD
    • ASANO KIMI
    • H04B7/24H04M11/00
    • PROBLEM TO BE SOLVED: To provide a communication system which is highly flexible and low in cost. SOLUTION: A PHS slave unit receives a telegraphic message (e.g., meter reading response) from a meter, converts a telegraphic message into a telegraphic message in a DTMF format of a DTMF signal 20 and transmits it as 8-bit character information with a digital signal to a PHS master unit. For instance, there is a system, in which only a numeric part 33 (123456) such as meter reading values in a telegraphic message 31 of the meter is set to an IA character 22 of the signal 20 as it is and is transmitted or a system, in which a telegraphic message bit string 31 (010001100 and so on) of the meter is divided into 3 bits as bit strings 35 (010, 001, 100, etc.), and it is converted into a numerical string 37 (2, 1, 4, etc.), characterized by each three bits, is set to an IA5 character 22 of the signal 20 and is transmitted, etc. The PHS master unit converts the telegraphic message of the signal 20 from the PHS slave unit into DTMF sound for transmitting it to a telephone line and transmits it to a center.