Abstract: In an electronic control unit, a control constant stored in a program memory is transmitted to a data memory via a serial communication circuit. First control circuit section (master station) and second control circuit section (substation) mutually communicate through series-parallel converters. The master station includes regular transmission device and storage constant confirmation processing device. The substation includes regular report device and confirmation reply device to a data transmitted from the master station. A constant set data transmitted from the master station by regular transmission device is stored in the data memory at the time of normal receiving. Confirmation information such as sum value of the entire data in the data memory is reported by regular report device. At the master station, if there is any error in the confirmation information, a constant set data is retransmitted with regular transmission device. Reliability of data in the data memory is improved.

Abstract: A first control circuit section (master station) and a second control circuit section (substation) communicate with each other via series-parallel converters. The master station includes regular transmission device and transmission-permitting signal generation device; and the sub station includes regular report device, confirmation reply device relative to a transmission data from the master station, and an unprocessed data table. The unprocessed data table prevents jam-up in upstream communication from the sub station to the master station, enabling to carry out timely regular transmission and regular reporting. Transmission from the sub station to the master station is performed based on a transmission-permitting control signal that the master station generates. Consequently, it is possible to execute communication error processing and diminish communication control burden on the master station while properly performing the regular transmission and regular report between the master station and sub station.

Abstract: An electronic control unit includes a serial communication circuit capable of easily confirming presence or absence of communication error while regular transmission/regular report between master station and sub station are performed timely. First and second control circuit sections 200a (master station) and 200b (substation) communicate mutually via series-parallel converters 117, 127. The master station includes regular transmission device 201 and irregular transmission device 211. The substation includes regular report device 221, confirmation reply device 205 and report reply device 215 relative to transmission data from the master station, and unprocessed data table 204. The confirmation reply device 205 and report reply device 215 confirm whether or not downstream communication from the master station to sub station is normal.

Abstract: First and second control circuit sections that mutually communicate via a series-parallel converter comprise first and second adder-subtracter respectively. When any receiving error occurs in each control circuit section, a variation value 3 is added to the adder-subtracter on the receiving side. When data is normally received, a variation value 1 is subtracted from the adder-subtradcter. Initial value of the adder-subtracter is set to 9. When a current value exceeds 11, first and second error detection signal is generated to carry out alarm display or initialization, and initialization and restart of the other-side control circuit section.

Abstract: A vehicle-mounted communication control apparatus includes: microprocessor 110a to which serial-parallel converter 117 for master station is connected; and common control circuit 120a to which serial-parallel converter 127 for substation is serial-connected to serial-parallel converter 117. The control apparatus includes first storage device 300 for storing transmission from master station to substation; distribution storage device 313 for transferring command data to device memory when command data stored in first storage device 300 is write/setting command; reply packet generation device 317 for generating up-reply information to microprocessor 110a; second storage device 320 for reading out on the principle of preceding input or preceding output while storing in order reply information and evacuating the delay; and reply packet composing device 338 for adding latest information to reply information and sending back resultant reply information.

Abstract: A vehicle-mounted communication control apparatus includes: microprocessor 110a to which serial-parallel converter 117 for master station is connected; and common control circuit 120a to which serial-parallel converter 127 for substation is serial-connected to serial-parallel converter 117. The control apparatus includes first storage device 300 for storing transmission from master station to substation; distribution storage device 313 for transferring command data to device memory when command data stored in first storage device 300 is write/setting command; reply packet generation device 317 for generating up-reply information to microprocessor 110a; second storage device 320 for reading out on the principle of preceding input or preceding output while storing in order reply information and evacuating the delay; and reply packet composing device 338 for adding latest information to reply information and sending back resultant reply information.