| 摘要 |
PURPOSE:To enable full duplex communication between a node that obtaining the right of transmission and a node that transmitted token frame by providing a controlling frame that reserve the right of transmission in own node even after giving the right of transmission to other node in a token frame. CONSTITUTION:A comparator circuit 19 compares registers 12 and 19 and checks slave node group to which the token frame is going to give the right of transmission. Comparator circuits 19, 20, 21 output ''1'' when coincidence is obtained. A decoder 22 decodes data of a control field register 15 and outputs ''1'' when a master node is token frame that does not abandon the right of transmission to allow sent token frame to make full duplex communication. The output of comparator circuits, 19, 20, 21 and the output of the decoder 22 are inputted to an AND circuit 23, and sets token receiving latch 24 if AND condition is established. However, if AND condition is not established, a token receiving latch 24 is not set.
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