Title:
MACHINE SECURITY SYSTEM
Document Type and Number:
Japanese Patent JP3869250
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To monitor whether each of security terminal devices composing a machine security system is normally operated or not.
SOLUTION: In this machine security system wherein the security information is transmitted from the security terminal devices 1-N respectively provided with a clocking device T to a monitor center 120, a time correction signal is transmitted from the security terminal device 1 to the security terminal devices 2-N by utilizing a distribution line 100 at a proper timing to correct the time to eliminate the time error among the clocking devices T of the security terminal devices 1-N, the data with time transmitted from the security terminal devices 2-N are transmitted to the security terminal device 1 by utilizing the distribution line 100, and a reception time of the data with time and a transmission time of the data with time are compared in the security terminal device 1 to discriminate the operating conditions of the security terminal devices 2-N.
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Inventors:
Koji Oda
Takehiro Oda
Kuriuchi
Takehiro Oda
Kuriuchi
Application Number:
JP2001344305A
Publication Date:
January 17, 2007
Filing Date:
November 09, 2001
Export Citation:
Assignee:
Nippon Electronics Co., Ltd.
International Classes:
G08B25/00; G04C9/04; G04G5/00; G08B25/06; G08B25/10; G08B29/12; G08B29/26; G08C15/00; G08C19/00; H04Q9/00; (IPC1-7): G08B25/00; G04G5/00; G08B25/10; G08B29/26; G08C15/00; G08C19/00; H04Q9/00
Domestic Patent References:
| JP1173897A | ||||
| JP2000059765A | ||||
| JP9230070A | ||||
| JP4127633A | ||||
| JP11101883A |
Attorney, Agent or Firm:
Masatoshi Takano