Title:
DATA COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3785291
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a data communication system that can surely detect collision of data on a communication path without the use of an dedicated hardware.
SOLUTION: A navigation device 2 adds collision detection data to a head of a frame at the transmission of a frame. Specific contents are set to the collision detection data by each device connected to a bus 5, and on the occurrence of two frames or over on the bus 5, the contents are destroyed without fail. A frame collision discrimination section 68 corresponding to a data transmission source compares added data actually sent/received on the bus 5 with additional data corresponding to its own device to detect collision of frames on the bus 5 in the case of dissidence. The frame collision discrimination section 86 corresponding to the data transmission destination compares additional data corresponding to each device connected to the bus 5 with additional data actually sent/received on the bus 5 to detect collision of frames on the bus 5 when they are dissident.
Inventors:
Takashi Miyake
Application Number:
JP20841499A
Publication Date:
June 14, 2006
Filing Date:
July 23, 1999
Export Citation:
Assignee:
Alpine Electronics Co., Ltd.
International Classes:
H04L12/413; H04B3/46; H04L12/40; (IPC1-7): H04L12/40; H04B3/46
Domestic Patent References:
| JP55118138A | ||||
| JP63146633A | ||||
| JP9233107A |
Attorney, Agent or Firm:
Masahiko Amagai
Previous Patent: SHOE TEMPLATING COMPOSITION AND MANUFACTURE OF LAST USING THE SAME
Next Patent: LENS MEASURING METHOD
Next Patent: LENS MEASURING METHOD