Abstract: A multiplex communication system used in an automobile achieves a low-power-consumption operation of a plurality of child stations. The multiplex communication system includes a parent station having a judging unit for judging whether or not a present communication mode of the communication system corresponds to one of a normal communication mode and a low-power-consumption mode, and a control unit for controlling the parent station and a child station to enter either a normal or a low-power communication mode. The system also includes at least one child station having a first detection unit for detecting a normal operation condition of the child station, a second detection unit for detecting that no input signal is being supplied from the parent station to the child station, and a condition changing unit for changing a low-power consumption operation of the parent station into a normal operation condition based on outputs of the first and second detection units.

Abstract: A multiplex communication system for an automobile which achieves low-power-consumption operation of a plurality of child stations. The system includes a parent station having a judging element to judge whether a communication mode of the system corresponds to one of a normal communication mode and a low-power-consumption mode; at least a child station having a detection unit for detecting that the supply of power to the child station has commenced to produce a power-supply detection signal, and a compulsory condition changing unit for changing a present operation condition of the child station to a low-power-consumption state in response to the power-supply detection signal; and a communication line for connecting the parent station and the child station.

Abstract: In an automobile multiplex data communication system (1000), a fail-safe function is established without providing a specific function switch. The automobile multiplex data communication system (1000) includes: transmission means (3:11:101:901) for transmitting operation data about a plurality of operation units (2a:106:204:704) provided with a plurality of terminal units (1a:202:602:902) corresponding thereto, which are required to operate an automobile; drive means (4:420) for driving a relevant terminal unit (1a:202:602:902) in response to said operation data; detecting means (5:410) for detecting an extraordinary state concerning transmission/reception operations of said operation data to produce an extraordinary-state detection signal; and control means (6:12) for independently controlling the operation of said relevant terminal unit (1a:202:602:902) by AND-gating said extraordinary-state detection signal and each of operation outputs derived from said operation units.

Abstract: A time division multiplex communication system applicable to an automotive vehicle and a method for communicating data between a master station and a plurality of slave stations are disclosed in which a master station is provided for sequentially accessing a plurality of slave stations according to a predetermined calling order within a predetermined period of time and for transmitting a required information to any of the slave stations on the basis of information received from one accessed slave station.

Abstract: In a multiplex communication system for transmitting and receiving data between a master station and a plurality of slave stations, the master station comprises a discriminator for collating an important switch information data transmitted from each slave station for reliability improvement. That is, two or more bit switch data transmitted by the slave station are compared with those stored in the master station and determined to be correct on the basis of a perfect bit level match or a bit level majority decision. Further, it is also possible to compare first data transmitted by the slave station with second data transmitted again by the slave station immediately after the first data transmission. Furthermore, it is preferable to change the access sequence from the master station to the slave stations according to power supply modes determined by ignition key switch positions for providing a higher response speed.

Abstract: An information transmitting and reception system applicable to a vehicle. The system comprises: (a) a plurality of information elements, some of which generating information for use by the remainder thereof, grouped into information sources and information receivers, the number of the information elements in the information sources and in the information receivers being limited to no more than a given number, (b) a plurality of information transmission units, each connected electrically to corresponding one of the information sources, (c) a plurality of information reception units, each connected electrically to corresponding one of the information receivers, and (d) means for connecting electrically each of the information transmission units to at least a corresponding one of the information reception units.

Abstract: A time-division multiplex transmission network system having a plurality of data processing stations, in which data of a predetermined number of bits is transmitted on a data transmission line for a period of time determined by the number of bits of data by one bit in synchronization with a synchronization signal extracted from a predetermined time series code string signal when one of code patterns derived from the predetermined time series code string signal coincides with a predetermined code pattern indicating an address allocated to one of the individual data stations.

Abstract: A network system having a single-wire common signal transmission line to which a plurality of data processing stations and a synchronous code signal generator are connected.

Abstract: A network system including a data transmission line through which a serial data is transmitted, a synchronous signal line through which a synchronous signal transmission for controlling a transfer of the serial data is transmitted, and a plurality of data stations connected to both the signal transmission line and synchronous signal transmission line, each one of the data stations transferring the serial data to any of the other data stations in accordance with the synchronous signal, wherein a period over which the serial data is transmitted to the data signal transmission line is varied according to a length of the serial data.

Abstract: A network system having a single-wire common signal transmission line for interfacing a serial bit data string between a plurality of data stations connected thereto comprises: (a) first means for repeatedly generating an address information bit signal based on a predetermined time series code for each predetermined synchronization timing, modulating each address information bit signal into a synchronous signal having a frequency which is varied according to a bit status of each address information bit signal, and outputting the modulated synchronous signal to the common signal transmission line so as to superpose on the serial bit data string, (b) second means provided within each station for demodulating the synchronous signal derived from said first means according to the frequency thereof so as to extract the bit status of the address information bit signal, (c) third means provided within each station for reproducing a signal corresponding to the predetermined time series code generated in said first mea