Refer to your machine manual.
For dressing operations, the machine must be prepared accordingly by the machine manufacturer. The machine manufacturer may provide his own cycles.
The term "dressing" refers to the sharpening or trueing up of a grinding tool inside the machine. During dressing, the dresser machines the grinding wheel. Thus, in dressing, the grinding tool is the workpiece.
The dressing operation removes material from the grinding wheel and may cause wear of the dressing tool. The material removal and wear lead to changed tool data that need to be compensated for after dressing.