On Fri, 2010-11-12 at 23:27 +0000, Andy Pugh wrote: > On 12 November 2010 23:17, Peter Cauchy <nald...@gmail.com> wrote: > > > I found my direction pin was not able to change state using the output > > from the parallel port, but expected a full 5v to change direction. > > So give it 5V! > > Actually I would be very surprised if it didn't float to whatever is > on the OPTO pin if disconnected. > > You do have a nice solid 5V to the OPTO pin?
Peter, I'm not clear on what is causing the problem, is it that OPTO wasn't hooked up, or OPTO was powered with 3 Volts, or the PC parallel port is a 3 Volt variety? Page 13 of the user's manual indicates OPTO needs 4.5 to 6.0 Volts. The inputs are shown as having OPTO to (OPTO - 1) Volts (4 to 5V if OPTO=5V) for a HIGH and 0 to .8 Volts for a LOW. A voltmeter could be used to check HIGH and LOW, an oscilloscope might be better. Just be careful using 5 Volts with a 3 Volt parallel port, if that is what you have. If you could post a schematic of how you have the driver hooked up to the parallel port, this may help me understand what's up. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
