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1SA, 2SA, 3SA, 4SA - Step Angle for the motor
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This is a decimal number which is often 1.8 degrees per step, but should reflect 
the motor in use. You might also find 0.9, 3.6, 7.5 or other values. You can 
usually read this off the motor label. If a motor is indicated in steps per 
revolution just divide 360 by that number. A 200 step-per-rev motor is 1.8 degrees,
a 400 step-per-rev motor has 0.9 degrees per step.

  1SA = 1.8 Sets step angle for motor 1. This is a typical value for many motors 
