transfers are intended for situations where the rate of transfer isn’t critical. If the bus is very busy, bulk transfers must wait, but if the bus is otherwise idle, bulk transfers are the fastest of all. USB virtual COM-port devices typically use bulk transfers for COM-port data. Interrupt transfers are for devices that must receive or send 321 Chapter 14 Table 14-1: Each of USB’s four transfer types suit different uses. Transfer Type Feature Use in Virtual COM Ports Control Three stages Setup, Data, Status . Enumeration. Set and get serial-port parameters. Set serial-port control signals. Interrupt Guaranteed maximum latency. Status information. Bulk Fastest on an otherwise idle bus. COM-port data. Isochronous Guaranteed transfer rate but no error detecting. COM-port data requires driver support from vendor . data periodically. USB virtual COM-port devices use interrupt transfers to send status information to the host. Isochronous transfers have guaranteed delivery time but no error correcting. Real-time audio uses isochronous transfers. With driver support, USB virtual COM-port devices can use isochronous transfers for COM-port data in place of bulk transfers. Transactions Each USB transfer consists of one or more transactions Table 14-2 . Each transaction contains a token packet, a data packet, and a handshake packet. An exception is isochronous transfers, which don’t have handshake packets. Each packet begins with a packet ID PID . The function of the PID varies with the packet type. The token packet contains the device address and the endpoint number the transaction is directed to. The token packet’s PID identifies the type of packet: SETUP the first packet in a control transfer , OUT other host-to-device packet , IN device-to-host packet , or SOF start-of-frame marker . The data packet contains any data the host or device is sending in the transaction. For control transfers, the transfer’s stage and the specific request determine who sends the data. prom-electric.ru

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Вылезла авария 023 на преобразователе частоты N3-401-C. Аналогичные устройства ATS48C17YS338, CIMRE7Z40451A, VFD022S21A на вентиляции без неисправностей.
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Выпадает неисправность w82 на инверторе M400-04400135A. Подобные приборы ATV61HD45N4S337, CIMR M5A 2045, E1-P7002 250H на компрессорах исправны.
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Загорелась error 173 на частотнике M400-02400013A. Похожие приборы ATV61EXS5C11N4, CIMRG7C41600A, SMC940100 -p установленные на насосах работают исправно.
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