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公开(公告)号：EP0114998A3
公开(公告)日：1987-05-13
申请号：EP83112634
申请日：1983-12-15
IPC分类号： G06F11/00
CPC分类号： G06F11/076 , G06F3/023 , H03M11/20
摘要： A keyboard interface for a data processing system in which a keyboard (6) and a data processing unit (8) are connected through a single clock line (4) for transmitting a keyboard out clock signal and a single data line (2) for transmitting a serial bit frame having a serial scan code identifying a depressed key in synchronism with the clock signal is disclosed. The interface uses a transmission error detection and resend procedure to prevent transmission error due to noise pulse induced on the clock line (4) as by electrostatic discharge to give rise to extra data sampling. The unit returns a status signal acknowledging the receipt of a frame to the keyboard (6) through the data line (2) immediately after the number of sampled bits received by the unit reaches the predetermined number of bits of a frame. The keyboard checks whether the status signal has been returned after the completion of transmission of a frame and, if not, returns a negative response to the unit through the clock line, then resending the same scan code. The interface permits the use of a low cost, low noise- tolerance stretch cable without shield.
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公开(公告)号：EP0114998A2
公开(公告)日：1984-08-08
申请号：EP83112634.7
申请日：1983-12-15
IPC分类号： G06F11/00
CPC分类号： G06F11/076 , G06F3/023 , H03M11/20
摘要： A keyboard interface for a data processing system in which a keyboard (6) and a data processing unit (8) are connected through a single clock line (4) for transmitting a keyboard out clock signal and a single data line (2) for transmitting a serial bit frame having a serial scan code identifying a depressed key in synchronism with the clock signal is disclosed. The interface uses a transmission error detection and resend procedure to prevent transmission error due to noise pulse induced on the clock line (4) as by electrostatic discharge to give rise to extra data sampling. The unit returns a status signal acknowledging the receipt of a frame to the keyboard (6) through the data line (2) immediately after the number of sampled bits received by the unit reaches the predetermined number of bits of a frame. The keyboard checks whether the status signal has been returned after the completion of transmission of a frame and, if not, returns a negative response to the unit through the clock line, then resending the same scan code. The interface permits the use of a low cost, low noise- tolerance stretch cable without shield.
摘要翻译： 一种用于数据处理系统的键盘接口，其中键盘（6）和数据处理单元（8）通过单个时钟线（4）连接，用于发送键盘输出时钟信号和用于发送的单个数据线（2） 公开了一种具有识别与时钟信号同步的按键的串行扫描码的串行比特帧。 该接口使用传输错误检测和重发程序，以防止由于静电放电引起的时钟线（4）上的噪声脉冲引起的传输错误，从而产生额外的数据采样。 在单元接收到的采样比特数达到帧的预定位数之后，该单元立即通过数据线（2）将确认接收到帧的状态信号返回到键盘（6）。 键盘在完成帧的传输后，检查状态信号是否已经返回，如果不是，则通过时钟线返回到本机的负响应，然后重新发送相同的扫描码。 该接口允许使用低成本，低噪音的拉伸电缆，而不需要屏蔽。
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公开(公告)号：EP0114998B1
公开(公告)日：1989-06-07
申请号：EP83112634.7
申请日：1983-12-15
IPC分类号： G06F11/00
CPC分类号： G06F11/076 , G06F3/023 , H03M11/20
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