Re: [SLE] /dev/ttyS0 and /dev/ttys0 - What's the difference?

From: Mark Gray (markgray-temp-1071686731_at_iago.nac.net)
Date: 12/18/03

  • Next message: Dylan: "Re: [SLE] /dev/ttyS0 and /dev/ttys0 - What's the difference?" 
    To: Dylan <dylan@dylan.me.uk>
Date: 18 Dec 2003 14:09:23 -0500

    Dylan <dylan@dylan.me.uk> writes:

    > On Thursday 18 December 2003 12:28 pm, Mark Gray wrote:
    >>
    >> Egads! /dev/cua* has returned. To have your program control your
    >> telescope you should be using /dev/cua0
    >
    > Well, cua1 in fact, but that's just cos I don't seem to have a physical
    > device for the ttyS0 / cua0. Hey-ho.
    >
    >>
    >> (Ages ago the cua* versions of the ttyS* devices were terminated
    >> (with extreme prejudice:-) and now I see that they are back,
    >> simplifying your problem entirely.) If you need more info just let
    >> me know. (I though it odd when checking devices.txt to see the cua*
    >> devices listed and just gave it a shot -- they work just like they
    >> used to. Anybody have any idea when they returned, or if they are
    >> now a SuSE only feature?)
    >
    > I sort of take it that the ttyS* are modem oriented and the cua* are raw
    > serial oriented, yes?

    No, the cua* come back from the days when there was a dialer separate
    from the modem. It just became conventional to have the ttyS*
    configured for answer mode, and the cua* for originate mode when the
    two functions were combined in modern modems. This came to be a
    kernel maintenance nightmare, so the cua* was removed (only for a
    while apparently.) You can still use the ttyS* for originate with
    only a little bit of programming, and otherwise the two are exactly
    the same device. 

    -- 
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