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RS-274D is a variation on traditional Numerical Control (NC) machine tool languages. It differs from traditional NC formats (i.e. drill data), as far as its use of tool selection codes but is otherwise compatible.
RS-274D data is organized in "blocks". A block consists of a combination of codes:
And, an End Of Block (EOB) character, which only follows a combination of the above codes.
An EOB character is usually an asterisk ('*') or dollar ('$'), optionally followed by a carriage return and line feed.
An RS-274D code consists of a letter D, G, M, X, Y, I or J followed by a numerical value. These codes designate the following: