Library /sys$common/syshlp/NCLHELP.HLB  —  create  modem_connect, line  communications_mode
    The optional Communications Mode argument specifies the
    communications method used on the link.  Possible comm-mode
    values are:  asynchronous and synchronous.  The default
    value is taken from the device capability.  If that is
    unknown, the default is synchronous.

    Example:

    create modem connect line DSY-0-0 -
         communication port DSY-0-0, -
         communications mode synchronous
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