Hi all,
I'm a bit confused as to what the minimum requirements are on a break out board. My planned system is a PC with LinuxCNC, BOB, drivers and stepper motors.

Take this for instance:
Click image for larger version.  Name: BOB.jpg  Views: 439  Size: 23.9 KB  ID: 8001
Obviously there are no opto couplers to protect the computer. But is anything else needed for comunicating with the stepper drivers?

Thanks
Patrik