Excavating
Patent
1994-02-18
1995-07-11
Canney, Vincent P.
Excavating
371 112, 371 34, G06R 1100
Patent
active
054328055
ABSTRACT:
During data transmission between a receiver and each of terminal devices in a disaster prevention supervisory system, the receiver sends calling data including address data for specifying a specific terminal device to the side of terminal devices in a transmission error detection mode. The receiver also causes the terminal device specified by the address data to return error detection response data including self-address data and check data for a current level previously defined. When the current level of the check data in the error detection response data received by the receiver is higher than the level previously defined due to the response of a plurality of terminal devices, it is decided that an abnormality is present in the terminal device of the address specified by the calling data. The arrangement provides a transmission error detecting method for securely detecting error in data transmission between the receiver and each of the terminal devices and enables improvement in the reliability of data transmission.
REFERENCES:
patent: 5255208 (1993-10-01), Thakore et al.
patent: 5283571 (1994-10-01), Yang et al.
Adachi Akio
Kikuchi Masamichi
Canney Vincent P.
Fogiel Max
Hochiki Kabushiki Kaisha
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