Data input control device for serial controller

A data input control device for a serial controller wherein a plurality of nodes each having one or a plurality of sensors connected thereto are serially connected to each other with a main controller included therein, said main controller delivers a predetermined data frame signal at a period sufficiently shorter than the variation interval of data detected by the sensors, and each of the nodes delivers data from a sensor connected to the node while the data is carried in the data frame signal, characterized in that the main controller includes:

• sensor data storing buffers arranged in plural stages each having a memory capacity capable of storing all sensor data from the sensors connected to the nodes, for temporarily storing data from the plurality of sensors contained in the data frame signal over a plurality of sampling periods;
• a true data storing buffer having a memory capacity capable of storing all sensor data from sensors connected to the plurality of nodes, for storing the sensor data which have been determined as true data;
• data reading means for performing data reading operation of reading the data from one sensor over a plurality of sampling periods by outputting a read address corresponding to a storage region where the data from a same sensor are stored to the sensor data storing buffers arranged in plural stages;
• a single comparing means for comparing data from one sensor over a plurality of sampling periods, said data being read by the data reading means;
• and
• transferring/memorizing means for transferring data to be compared stored in sensor data storing sections arranged in the plural stages so as to store the data in a storage region corresponding to a sensor data storing section of the next stage upon completion of the comparison by the comparing means, and transferring to a storage region corresponding to the true data storing buffer data to be compared in one of the sensor data storing sections arranged in plural stages so as to store the data in a storage region, corresponding to the true data storing buffer, only when results derived from the comparison performed by the comparing means coincide with each other, and wherein
• the data reading means successively updates read addresses for the sensor data storing buffers arranged in plural stages by one each time a comparison is completed by the comparing means;
• and
• the transferring/memorizing means successively updates the access addresses, for the sensor data storing buffers arranged in plural stages and the true data storing buffer, by one each time the transferring/memorizing operation is completed, said storing of sensor data as true data being performed independently for each sensor data.