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There are only 2 signals per driver you need to take from your Ramps (or what ever board you are using) to connect a stronger cnc type stepper driver, the P- (pulse negative or sometimes called step) and D- (direction negative) which usually control the small onboard 2.5A 3D printer stepper drivers

The E+ (enable positive) P+ (pulse positive) and D+ (direction positive) are all tied to +5V

Check out this image which shows how to connect cnc drivers to a Ramps 1.4 (what I found and used for reference):