Re: serial login to SBC

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 09/30/05

  • Next message: Vaclav Haisman: "Re: journaling fs and large mailbox format" 
    Date: Fri, 30 Sep 2005 12:55:39 -0600 (MDT)
To: babkin@users.sourceforge.net, babkin@verizon.net

    In message: <16436490.1128102582153.JavaMail.root@vms071.mailsrvcs.net>
                Sergey Babkin <babkin@verizon.net> writes:
    : >From: "M. Warner Losh" <imp@bsdimp.com>
    :
    : >In message: <20050930154306.GJ74605@numachi.com>
    : > Brian Reichert <reichert@numachi.com> writes:
    : >: On Fri, Sep 30, 2005 at 05:14:01PM +0200, jerry@evasefor.com wrote:
    : >: >
    : >: > Hello list,
    : >: > I am trying to use a FreeBSD box to log into a Single Board Computer. I
    : >: > have a null modem and it's plugged to both serial
    : >: > ports. The SBC runs openbsd ( /dev/cua00).
    : >: > When I run "cu -l /dev/cuaa0" from FreeBSD, I don't get any login
    : >: > prompt.
    : >:
    : >: Do you have getty running on that port on the SBC?
    : >
    : >Do you have all the modem pins connected for this cable?
    :
    : Also, is the cable pin-out correct even for the Rx
    : and Tx pins? There are weird recombinations of
    : male-female and DCE-DTE pin-out used by different
    : manufacturers. The easiest way to check is to get
    : a port tester (a pass-through BOX with LEDs) from
    : some place like Radioshack.
    :
    : The correct Unix cable connection is
    :
    : Tx - Rx
    : DTR - DSR, CD
    : CTS - RTS
    :
    : (and the other side symmetric). Many cable
    : manufacturers use different (wrong) connections.

    Closely related is the

            1 3 5 7 9
            2 4 6 8 10

    vs

            1 2 3 4 5
            6 7 8 9 10

    issue for headers.

    Warner
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