Kirk Wallace wrote: > My lathe has a pulse generator with an index signal, but while trying to > hook it up to my UnivPWM controller, I am beginning to think that it's > not compatible with the controller. Are the encoder inputs only > compatible with quadrature encoders? I can utilize a software encoder > counter in HAL on another parallel port, but I believe that software > counters would be too slow. Is fitting a quadrature encoder my only > option?
The UPC has quadrature inputs, and the EMC2 driver and threading code all requires encoder counts, and a reset to zero on the index pulse. So, your "pulse generator" just has one channel of pulses? I can see one way to make this work, which is to delay the single pulse with an RC delay or a one-shot circuit to turn it into a simulated quadrature signal. First, here's what I'd do, is connect the pulse output to the UPC's A encoder input, and connect a 10 K Ohm resistor between the A and B encoder inputs. Then, connect a .01 uF capacitor from the B input to ground. This will create a 100 us delay between A and B, which should satisfy the counter as a valid quadrature pattern. Try this first, if it doesn't work, I can give you instructions to make a delay with a one-shot chip. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
