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I am keen in knowing G-Codes thoughly and apply them in CNC machines. Can anyone recomend me a website/book that clearly deals G-Codes. I had to write a G-Code for tapping cycle, where i had no clue as to how to handle IOs in a PC based motion control package. Please give me some basic idea about M-Codes and how a particular output is addressed. For an instance, if i have some code which turns the spindle ON, which particular output of my output port has to be assigned for spindle?