We are in the business of supplying simple, cost effective, easy to use, and PROVEN solutions to RS232 communication problems. Our cable kits can solve what sometimes appear to be an impossible task, communicating with a CNC! Our kits are proven and easy to use. Our complete kits come with step by step, button by button, instructions to guide you through software installation, parameter settings, and test communication. Complete kits come with sample programs specific to each machine for immediate upload upon installation! This way you know that it's working and ready to use. We have been selling these kits on Ebay for years with fantastic results and feedback. Thanks for stopping by!