MULTIPLY steps & speed by microsteps!!!

register U 0x581 stepper  -> OK\nU maxspeed=OK
mesg U maxspeed 12800     -> OK\nU maxspeed=OK
register V 0x582 stepper  -> OK\nV maxspeed=OK
mesg V maxspeed 12800     -> OK\nV maxspeed=OK
mesg U relmove 1600       -> OK\nU rotdir=OK\nU relsteps=OK
mesg U setzero            -> OK\nU curpos=OK
mesg V setzero            -> OK\nV curpos=OK
