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The steps_per_mm parameter is used to calculate the number of steps to move the
unload table stepper motor based on a target position specified in millimeters.
The value in this parameter must specify the number of pulses that the CY-545
motor conroller needs to output in order to move the unload traveller exactly
one millimeter.
The steps_per_mm parameter assumes an implicit decimal point, i.e. a value of 10
means that it takes exactly 1.0 pulses to move the traveller 1 millimeter.
Syntax: set aldrv 2 spm
Other products have more than one stepper motors axis, so used "set aldrv 1" and
"set aldrv 2" for the separate axes. The 3244 Trendsetter Autoloader has only one
axis, but kept the same parameter structure for consistency.
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