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    SubjectRe: pl2303 ttyUSB0: pl2303_write - failed submitting write urb, error -22
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    > > > What kernel version are you using?
    > > >
    > >
    > > I am using kernel version 2.6.25.I cann't use current linux kernel version because it
    > > uses the generic write function and for my application I need pl2303_write.
    >
    > Then you are really on your own here, sorry.
    >
    > good luck,
    >
    > greg k-h


    Hi Greg.

    I am now able to transmit the Address byte with mark parity and data bytes
    with space parity properly.

    Thanks a lot greg for you help....

    Below is the control signal and data going out on USB bus number 7.

    f5aafd00 2277683484 S Co:7:002:0 s 21 20 0000 0000 0007 7 = 80250000 000308 // Control
    signal for mark parity

    f5aafd00 2277684456 C Co:7:002:0 0 7 >
    f5aafd00 2277684497 S Co:7:002:0 s 21 22 0003 0000 0000 0
    f5aafd00 2277685456 C Co:7:002:0 0 0
    f2b8e900 2277685476 S Bo:7:002:2 -115 1 = 05 // Address byte
    f5aafd00 2277685482 S Ci:7:002:0 s a1 21 0000 0000 0007 7 <
    f5aafd00 2277686455 C Ci:7:002:0 0 7 = 80250000 000308
    f2b8e900 2277686461 C Bo:7:002:2 0 1 >
    f5aafd00 2277686518 S Co:7:002:0 s 21 20 0000 0000 0007 7 = 80250000 000408
    // Control signal for Space parity
    f5aafd00 2277687457 C Co:7:002:0 0 7 >
    f2b8e900 2277687471 S Bo:7:002:2 -115 8 = 08000000 000000f8 // Data bytes
    f5aafd00 2277687474 S Ci:7:002:0 s a1 21 0000 0000 0007 7 <
    f5aafd00 2277688455 C Ci:7:002:0 0 7 = 80250000 000408
    f2b8e900 2277688461 C Bo:7:002:2 0 8 >
    f5aafd00 2277697534 S Co:7:002:0 s 21 22 0000 0000 0000 0
    f5aafd00 2277698456 C Co:7:002:0 0 0
    f2b8e580 2277700457 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000 // What I am receiving
    currently.
    f2b8e580 2277700486 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277702455 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277702478 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277704455 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277704477 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277706457 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277706480 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277708455 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277708476 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277710455 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277710484 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277712455 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277712477 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277714454 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277714471 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277716452 C Ii:7:002:1 0:1 10 = a1200000 00000200 4000
    f2b8e580 2277716464 S Ii:7:002:1 -115:1 10 <
    f2b8e580 2277718455 C Ii:7:002:1 0:1 10 = a1200000 00000200 0000
    f2b8e580 2277718480 S Ii:7:002:1 -115:1 10 <


    Thanks & Regards,
    Raj.


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