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    Just a heads up for you OSX users thinking of upgrading to the next
    version of OSX: El Capitan.  Unsigned drivers will no longer be
    supported (existing methods to allow unsigned drivers is being
    removed):<br>
    <br>
      
<a class="moz-txt-link-freetext" href="http://www.machamradio.com/blog/2015/7/16-unsigned-device-drivers-in-os-x-v1011-el-capitan">http://www.machamradio.com/blog/2015/7/16-unsigned-device-drivers-in-os-x-v1011-el-capitan</a><br>
    <br>
    --David<br>
    KI6ZHD   <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 07/09/2015 10:29 AM, Daniel
      Lichterman wrote:<br>
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cite="mid:CADzM8joNO1ayKX7YN+N3LrpA9EZ5430KB137H5h5CaRO=R+ehw@mail.gmail.com"
      type="cite">
      <div dir="ltr">Pat - there was a post on this group last month
        regarding this and the solution:
        <div><br>
          <div>===============================================================</div>
          <div>
            <div dir="ltr" style="font-size:12.8000001907349px">Here is
              what I found. The driver is the issue with Yosemite.  The
              built-in FTDI driver prevents the <span class="">osx</span>-pl2303
              driver from loading.  The fix (not for the faint of heart)
              is to do some black magic at the command line.
              <div><br>
              </div>
              <div>In Terminal, enter:</div>
              <div><br>
              </div>
              <div>
                <pre style="white-space:pre-wrap;border:0px;font-family:'Courier 10 Pitch',Courier,monospace;font-size:13px;margin-top:0px;margin-bottom:1.625em;outline:0px;padding:0.75em 1.625em;vertical-align:baseline;font-stretch:normal;line-height:1.5;color:rgb(51,51,51);background:rgb(244,244,244)">sudo nvram boot-args="kext-dev-mode=1"</pre>
              </div>
              <div>This allows other drivers to load.  The driver that
                works for me is the Lion driver from <a
                  moz-do-not-send="true" href="http://miklor.com/"
                  target="_blank">miklor.com</a>.</div>
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