richard_pr...@att.net wrote: > I am a new user of EMC, and this group. I would like to replace an existing > CNC with a PC and EMC. I wish to connect as a closed lop servo system > thru the printer port. > > What interface do I need for connecting analog drive signal from the PC, and > encoder feedback to the PC? Can this be done directly with just the printer > port, or do I need to get another interface? > > I have PWM drives already, I just need the pin-you from the parallel port > for input and output for servo drives. > Are these analog-input velocity servo drives, or digital-input drives? Generally, you can't fo this with just the printer port, due to the rate of enocder counts. There are several interfaces that use the parallel port, such as the Pico Systems Universal PWM Controller (for digital-input PWM drives) and the PPMC for analog-input drives. See http://pico-systems.com/oscrc4/catalog/index.php for more info on these.
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