P1394 Mail Archive: P1394> Logical_Unit_Number - Device_Type

P1394 Mail Archive: P1394> Logical_Unit_Number - Device_Type

P1394> Logical_Unit_Number - Device_Type field question

From: RICE,CHUCK (HP-Vancouver,ex1) (chuck_rice2@hp.com)
Date: Mon Jun 12 2000 - 19:40:04 EDT

  • Next message: Peter Johansson: "Re: P1394> Logical_Unit_Number - Device_Type field question"

    The last sentence on page 49 of Draft 1.1 of the 1394.3 spec reads: "The
    device_type field shall be 1F, unspecified device type.". I was wondering if
    someone could shed some light as to why 1F is mandated for device_type. If the
    device_type is required to be unspecified then what determines the device type
    associated with the Unit directory? An example of this would be an MFP that
    implements a PPDT Printer and a PPDT Scanner. If a device does not list it's
    device type in the Instance Keyword leaf or if someone gets to the Unit
    directory without going through the Instance directory; what would differentiate
    the Unit directories of the printer and the scanner? How would the initiator
    know which one is which?


    Chuck Rice
    Software Engineer
    Hewlett Packard Company
    Vancouver Division
    1115 SE 164th Ave
    Vancouver, WA 98683

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