Tool, Null Modem Cable, 9 Pin Female to 9 Pin Female, 6ft, Used to talk directly to the Parker Gemini GV-U3E Motor Controller on the 3900 for trouble shooting. Also requires that the Gemini Motion Planner software be installed on the computer. This software is available free from the Parker Website. http://www.compumotor.com/scripts/support_downloads.asp#MP
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