Method of, and a terminal for, transmitting bytes to a bus
    14.
    发明授权
    Method of, and a terminal for, transmitting bytes to a bus 失效
    用于将字节传送到总线的方法和终端

    公开(公告)号:US4569046A

    公开(公告)日:1986-02-04

    申请号:US514445

    申请日:1983-07-18

    CPC分类号: H04M9/025 H04L12/4013

    摘要: A plurality of terminals, such as digital telephones, are connected to a serial data bus formed by a balanced two-wire line. Each terminal transmits bytes bit-serially with the magnitude bits first, in order of decreasing significance, then the sign bit, and finally an even parity bit to maintain the balance of the line, the "1" bits being transmitted with alternating polarity. The terminals operate simultaneously and in synchronism. If a terminal, during a "0" bit of a byte which it is transmitting, detects a "1" pulse on the bus from another terminal, then it gives up transmission for the remainder of that byte and receives the greater magnitude byte which prevails on the bus. Thus a single two-wire line can be used for digital transmission in both directions between arbitrary numbers of telephones.

    摘要翻译: 诸如数字电话的多个终端连接到由平衡双线线路形成的串行数据总线。 每个终端首先以幅度比特顺序发送字节,按照有效性降低的顺序,然后是符号位,最后是偶数奇偶校验位以维持线的平衡,“1”位以交替极性传输。 端子同时运行并同步运行。 如果终端在其正在发送的一个字节的“0”位期间从另一个终端检测总线上的“1”脉冲,则放弃该字节的其余部分的传输,并接收较大的幅度字节 在公交车上。 因此,可以在任意数量的电话之间的双向线路中使用单根双线线路进行数字传输。