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    • 2. 发明授权
    • Information processing apparatus and method and storage medium
    • 信息处理装置及方法及存储介质
    • US06771668B2
    • 2004-08-03
    • US09062503
    • 1998-04-20
    • Koji FukunagaKiyoshi Katano
    • Koji FukunagaKiyoshi Katano
    • G06F1336
    • H04L12/40058H04L12/40117H04L12/6418
    • A host device logs in a printer as a print data transfer destination to acquire type information of the printer and issues SB_CONT.req to determine whether a cycle master necessary for isochronous transfer is present on a serial bus. The print data transfer mode and transfer parameter are set in accordance with the presence/absence of the cycle master and the acquired type information. If the cycle master is present on the serial bus, isochronous transfer is set as the transfer mode; otherwise, asynchronous transfer is set as the transfer mode. Therefore, even when devices without any cycle master function are connected, or no cycle master is present on the bus, print data can be transferred from the host device to the printer.
    • 主机设备登录打印机作为打印数据传输目的地以获取打印机的类型信息,并发出SB_CONT.req以确定串行总线上是否存在等时传输所需的循环主机。 打印数据传送模式和传送参数根据循环主控器的存在/不存在以及所获取的类型信息来设置。 如果串行总线上存在循环主机,则将同步传输设置为传输模式; 否则,将异步传​​输设置为传输模式。 因此,即使连接了没有任何循环主站功能的设备,或者总线上没有循环主站,打印数据可以从主机设备传输到打印机。