@5-0coyote
Curt,
You have a G3 MASSO, so the A & B axes outputs are identical to the X & Y & Z axes, so wire the B the same as the Y. The documentation that you linked too is for the G2 which used different outputs for the A & B axes.
When it comes time to calibrate/setup your axes, you tell MASSO that B is a slave off Y.
Regards,
Arie.