| 摘要 |
PURPOSE:To enable communication free from collision of data to each communication station that sends a transmission request independently by providing a transmission priority order determining circuit, data branching circuit and a switch for terminal in a daisy chain circuit. CONSTITUTION:The switch 203 for terminal makes the daisy chain circuit on when the circuit exists at the end of a cascade connected lower rank station, and returns a signal RS from a higher rank station as a signal CS from a lower rank station. State of flip-flop 204, 205 of the transmission priority order determining circuit 201 is determined by the state of transition of RS and the state of the signal CS transmitted through a line 11, and the signal CS is outputted to lines 12, 13. Data from a branching station are transmitted through an OR circuit 207 and OR circuit 208 of a transmition/reception data branching composite circuit 202, and data of other stations are received through an OR circuit 209. |
