Sequencing data transmission process

• US 4,679,045 A
• Filed: 05/21/1985
• Issued: 07/07/1987
• Est. Priority Date: 05/22/1984
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Maeda, Keini, Sadamori, Yuuichi
• Primary Examiner(s): YUSKO, DONALD
• Application Number:
  US06/736,381
• Time in Patent Office: 777 Days
• Field of Search: 340/825.07, 340/825.52, 340/825.5, 340/825.03, 340/825.54, 340/825.08, 370/85, 364/136
• US Class Current: 370/449
• CPC Class Codes: G06F 13/38 Information transfer, e.g. on bus G06F13/14 takes precedence

Abstract

In a data transmission system wherein data are transferred between a control station and a plurality of tributary stations under the control of the control station, the tributary stations are sequentially selected and during the selection of each tributary station, data is transmitted first from the control station to the selected tributary station, and then from the tributary station to the control station; the control station and tributary station performing collection and processing of data during the transmission times to overcome delays and wait periods.

Claims

1. A data transmission process for tranferring data between a control station and a plurality of tributary stations connected with said control station by a common transmission line, wherein each of the control station and the tributary stations includes a processor for collecting and processing blocks of data, and an interface connected between the processor and the transmission line for receiving and transmitting blocks of data from and to the transmission line;

the data transmission process comprising the steps of;

selecting, by means of the control station, the tributary stations one at a time in a predetermined sequence for receipt and transmission of data;

transferring a block of data previously collected by the control station processor for each selected tributary station to the control station interface when each tributary station is selected;

transmitting the transferred selected tributary block of data by the control station interface over the transmission line from the control station to the selected tributary station;

processing, during the transmission of the selected tributary block of data, previously received control station data by the control station processor;

collecting, during the transmission of the selected tributary block of data, a next control station block of data by the processor of the selected tributary station;

transferring the selected tributary block data by the selected tributary station processor from the selected tributary station interface after the transmission of the selected tributary block of data is completed;

transferring the next control station block of data collected by the selected tributary station processor to the selected tributary station interface after the transfer of the selected tributary block of data from the selected tributary station interface is completed;

transmitting the transferred next control block of data by the selected tributary station interface over the transmission line from the selected tributary station to the control station;

processing, during the transmission of the next control block of data, the selected tributary station block of data by the selected tributary station processor;

collecting, during the transmission of the next control block of data, a next selected tributary block of data by the processor of the control station; and

transferring the next control station block of data by the control station processor from the control station interface after the transmission of the next control station block of data is completed.

2. A data transmission process as claimed in claim 1 wherein the step of transferring the selected tributary block of data by the selected tributary station processor, and the step of transferring the next control station block of data by the control station processor are conducted as interrupt processes by the respective processors wherein the interrupt processes are called at the termination of the corresponding transmitting steps.