As you require no variable speed the cheapest solution would be to use two relays, a DPDT to control direction of travel and a second one to control on and off. Even the on/off relay could be optional as the positioner seems to contain built in limit switches, removing power once travel to one end has completed.Lefty
The only other issue I now have is controlling a high-power stepper motor (it will control a steering column).http://www.anaheimautomation.com/manuals/stepper/L010395%20-%2034Y65%20Series%20Spec%20Sheet.pdf
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