What do you have the machine RS232 settings set at? Specically, what baud rate are you trying to send at when running the 50+' cables?
I tried 9600 baud rate, I even tried 1200, 2400, and 7200, only 38400 works with a short cable. I've been mining the forums looking for rs232 serial configuration for HAAS and they all look pretty similiar.
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