| 摘要 |
A data transmitting apapratus has: a plurality of terminals such as image readers, each for reading original image data and transmitting the image data; a memory for storing the image data from the terminals; a frame processor for producing the frame data from the data stored in the memory; and a controller for transmitting the frame data to the line. A data receiving apparatus has: a plurality of terminals such as word processors, work stations, printers, display devices for outputting the reception data; a circuit for setting an identification number (ID) to each terminal; a controller for receiving the data sent from the line; a decoder for decoding the data received by the controller; a memory for storing the decoded data; amd a circuit for outputting the data stored in the memory to the terminal of the designated ID through the line. Each image reader and each ID have a logical channel group number and logical channel number which are set by a table. With this data communication system, the data transmission and reception can be simultaneously performed, the use efficiency of the system can be improved, and wasted or unnecessary communication time can be eliminated.
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