My Step2Linear boards are on the way. I am going to be converting a knee mill that had a Mitutoyo Millstar III control on it. The control consisted of Glentek 7115 Servo Amplifiers and Glentek DC brush Servo motors.

I have a couple questions. The Step2Linear manual seems to indicate a diagram to make up the serial cable to communicate with the board yet unless I missed it, I couldn't find it.

Secondly, the manual indicates using a center tapped 20V transformer for the power supply, after rectification does that not yield about 28VDC? Which is way over the 18VDC limit. Now if I got a 12VAC center tapped transformer, that should yield me 16.9V correct?

I'm sure I will have some basic questions, I will ask here for everyone's benefit.
Marty