... current:1.3A-4.5A3.Mircostepping:1(1.8º),1/2,1/4,1/8,1/16,1/32,1/64,1/128,1/2561/5,1/10,1/25,1/50,1/125,1/ ... poleNote:Must guard against exceeding 50V,so as not to damage the module2,GND:DC power cathode3,A+, ... or use axle flows fan dispels the heat, to make the module run reliably for a long time. ... machinery is connected with driver , users are apt to connect the phase by mistake, thus would damage the ...