| 摘要 |
PURPOSE:To make a handshake transmission possible with easy procedures by using one handshake line and pulling up always this line to the high level. CONSTITUTION:When a handshake line 12 is in the high level, a data line 11 is driven by a driver 3 in a transmission end 1. Next, the handshake line 12 is driven to the low level by the first open collector driver 15 in the transmission end 1. Meanwhile, the fall of the handshake line 12 is detected in the reception end 2, and the handshake line 12 is driven to the low level by the second open collector driver 6. The transmission end 1 releases driving of the handshake line 12 after a preliminarily determined time so that the reception end 2 can detect the fall of the handshake line 12. The reception end 2 releases driving of the handshake line 12 after receiving data through a data receiver 4. The transmission end 1 releases driving of a data line 11 after detecting that the handshake line 12 goes to the high level.
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