First, draw a regular rectangle, mark it, and check if it is a regular rectangle, if not, do the following correction:

1‧Correct the rectangle to be a regular rectangle.

Correction: There are three types of correction (include: barrel correction, trapezoid correction, and parallelogram correction).

Barrel Correction

Input a square, the output become as below:

X value is positive		X value is negative
Y value is positive		Y value is negative

Trapezoid Correction

Input a square, the output become as below:

Parallelogram Correction

Input a square, the output become as below:

2‧Adjust the rectangle to its right size.

Scale：If the rectangle size does not match, adjust the scale value.

3‧Adjust the rectangle to the right position

Offset：If the position of the rectangle does not place in the right position, adjust the offset value.

Program Ready signal will be high when entering the program, and will be low if exit the program. Marking Ready signal will be high while executing mark function and will be low when pressing the "Exec" button or exit the dialogue box of marking. And when a mark job done, the system will send a Marking End signal out to announce the job finished.