On Fri, Nov 12, 2010 at 09:00:57PM -0500, Peter Cauchy wrote: > > If the parallel port is not putting out BTW 4 and 5v, I do not > understand how to increase this.
The easiest way to increase the high-state output voltage, when it's only getting to three-and-a-bit volts, is to add a pull-up resistor. Try connecting 1k between the offending output and +5v, and measure the resulting output voltage. > 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. Does any of that help in your case? Erik ------------------------------------------------------------------------------ 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
