| 摘要 |
PURPOSE:To attain real time communication by providing memories comprising command and data bytes for the number of sets of controllers and controlling the data transmission/reception depending on the presence of a flag in the command byte. CONSTITUTION:A command memory 20 storing a command byte and a data memory 21 storing a data byte representing the content of information are provided in a communication equipment 21 and the memories 20, 21 store the command and data bytes for all communication equipments. That is, the command and data bytes by the number of sets of the controllers 11-1n are stored in each memory and the memories are refreshed for each prescribed time by the time slot communication at a higher than the write and readout cycle from the controller. Thus, the memories 20, 21 store a common data corresponding to one common memory with respect to the controllers 11-1n, and the control of data transmission/reception is applied depending on the presence of a flag in the command bytes and real time communication is attained with simple constitution.
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