On Fri, 17 Jul 2009, Leslie Newell wrote: > Date: Fri, 17 Jul 2009 20:48:16 +0100 > From: Leslie Newell <les.new...@fastmail.co.uk> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Hostmot2 homing > > Hi Peter, > >> One difference is that the TTL inputs have an RC filter, the differential >> inputs have none. > > Hmm, that could still point towards a noise issue then. > > >> I wonder if your index outputs can drive the termination resistor. Have you >> measured you index and /index outputs for reasonable differential output >> voltage when terminated by the 7I29? > > The outputs swing from 0.48V to 4.1V. It makes no noticeable difference > in either TTL or differential modes.
What I was asking about (maybe not very well) is differential drive: in other words measured between IDX and /IDX. This should be positive in one index state and negative in the other. Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users