I have old stepper motors and drivers for them. I cant find actual datasheet for the driver, but it seems that the drivers are similar to these: http://docs-europe.electrocomponents.com/webdocs/001c/0900766b8001c0a0.pdf
Before the controllers were connected such, that pins 23 and 24 are used to drive the motors. Now the simple question is, that how the drivers are used (with arduino)?
According to figure 2, I just go to nearest electronics shop and buy 6 optocouplers (or 3 dual channel) and connect them to drivers and Arduino, but how?