On 09/21/2014 02:42 AM, David Armstrong wrote: > Guys ,, > > could anyone send me a config for use with geko stepper drivers > specifically how to deal with the charge pump
(Oops, when you mentioned charge pump, I assumed you were talking about the G540, which is known to have charge pump issues with LinuxCNC) The short answer on the charge pump is that the signal needs more current than a normal logic input. There are a few options on how increase this current. Putting the parallel port into EPP mode enables drivers in the parallel port and is the most accepted (not best) method. The problem is that many parallel port PCI cards still don't work this way. Another option is to add a pull-up resistor to the signal or use a buffered break-out-board to provide the extra current needed. My notes on the G540 charge pump are here: http://wallacecompany.com/machine_shop/G540/ The oscilloscope trace pictures have 1 Volt per division on the vertical axis (just under 3V max. on some to 5V max. on others). The file names hint at what the configuration is, such as card name, port mode EPP or SPP, pull-up, etc. There is also a jumper to force the G540 into enabled mode. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that Matters. http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
