On Wed, 2012-01-25 at 19:26 +0200, Andrew wrote: ... snip > 2. The friend's machine has 7 servos (including 3 spindles) in step/dir > mode, and RS422 is preferred for higher input frequency. Which RS422 > daughter cards for 5i20 (or other FPGA) are supported with hardware? ... snip
What servo drivers does he have? If the drivers have the option, it might be better to use a torque or velocity input. RS422 is a standard that describes handling a signal through a pair of wires. Generally, I believe any digital input could be made to handle RS422 by adding a RS422 receiver chip. How many pairs of wires come from the encoders? For step/dir drivers, the encoders are wired to the driver, and optionally, the CNC controller. If you use the driver torque or velocity inputs, the encoders are wired just to LinuxCNC. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
