>> I am running the OPTO off the USB 5v supply. The parallel port, USB and >> motor supply ground are all tied together. The USB 5v is tied to OPTO. >> Pin 7 on parallel port is tied to DIR and pin 8 to PULSE. The other >> inputs are left unconnected. > If the offending output is driving the opto, the more sensible approach > is to utilise the higher sink capability of most logic outputs. Then > high-state output is not a limitation.
The USB is being used only for the 5v for OPTO isolation power (5.12v) to the driver. The signal for dir and pulse is from the parallel port and low logic is 1.2v and high is 3.3v-4.6v. I have tried a 1k resistor and the voltage was only 3.3v. ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
