Zolix Instruments SC300 Operation Manual page 6

4) Fan
5) RS232 interface
Note:
If you have the SC300-XA, which has a default microstep of 8, and
want to change the microstep, you must open the SC300 case and set the
microstep and current according to the form printed on the driver.
The driver (M415B):
The switch:
Current setting should follow:
If you have the SC300-XB, which has a default microstep of 8, and want to
change the microstep, you must open the SC300 case and set the microstep
and current according to the form printed on the driver.
Zolix Instruments Co., Ltd.
Microstep setting should follow:
4
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Function Introduction