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Hello everyone, I have a chinese hot tub which has an rs232 cable connection what is connected with control panel GD-3003 (http://www.mrtubby.co.uk/gd-3003-chinese-topside-hot-tub-control-panel-140-p.asp). Is there a possibility to control a hot tub heater, temperature, pumps, etc. with rs232 cable connected to computer or some other brand of control panels which has more options? any help suggestion is appreciated
