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& J Codes
Full 360 arcs allow the plotter to draw a full circle (360 degrees of arc) in one single command..
Quadrant arcs only allow for an arc to be drawn through a maximum of 90 degrees of arc, never crossing a quadrant boundary. Due to this restriction, I and J arc center offset codes can get away with never having a negative value, even if the offsets are negative!
When in a Full 360 arc (G75), only one command is required to draw a circle. In Quadrant mode, the same circle would require at least 4 Quadrant arcs (G74), because a circle goes through all four quadrants.
Quadrant arcs will always have positively signed I and J values, even if the center offset is actually negative. Full 360 arc center offsets can be signed positively or negatively. A negative I or J is a sure indicator of Full 360 arcs.
Bi-directional Input and Output (I/O) ports couple the microcontroller to external devices. This interface can operate in parallel or serial form and is usually digital (0 to +5Vdc) logic. Parallel interfaces allow I/O data transfer of eight bits at a time to parallel ports on the microcontroller. The technology is typically used to transfer data between the microcontroller and the external logic it controls.
Input Capture (Timer Function)