Re: [PARPORT] Difference between PPNEGOT and PPSETMODE?

From: Philip Blundell (
Date: Mon Feb 05 2001 - 11:44:52 EST

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    In message <>, Mohammed El Shobaki write
    >We have a problem with negotiating to EPP (or any other mode except COMPAT)
    >using the PPNEGOT command (returns -1). However, if we run PPSETMODE for
    >the same mode(s) as arguments it succeeds. The question is, what's the
    >difference between NEGOT and SETMODE?

    I think PPSETMODE just forces the port mode to what you asked for. PPNEGOT
    actually negotiates with the peripheral at the other end for a mutually
    acceptable mode.

    >Also, we're very confused by the failure of NEGOT because we are using real
    >IEEE1284 ports that are claimed to support EPP and ECP.

    It's more a case of what the peripheral attached to the port understands. You
    can negotiate for EPP even on a SPP port.


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