On Sunday 06 May 2007, John Kasunich wrote: >Gene Heskett wrote: >> Greetings guys; >> >> newsig motion.probe-input bit >> linkps parport_pin-10-input => motion.probe-input > >You are only making half the connection. >You're an electronics guy, are you familiar with the concept of >netlists?
Not really, John, those sorts of design concepts are newer than much of my experience, remember, I go all the way back to vacuum tubes, and still deal with them almost on a daily basis. Over nearly 60 years, I've taught more electronics classes than I've been to as a student. The first time, at just barely 17, I'm not sure if some of the grizzled old farts in the audience that I've turned into were all that convinced I knew what I was talking about. But when they got stumped, the tv wound up on my bench just the same. >A net connects two or more pins. Or how about wiring >diagrams? Wires typically are numbered, and wire 23 connects two >or more things. Yup. >In HAL, a signal corresponds to a net or a wire, and pins are >the things it connects. > >Your first command above creates a signal (or net or wire, whatever >term makes the most sense to you) called "motion.probe-input". That >command does NOT connect the signal/net/wire to anything. The second >command connects the signal to the parport. But you haven't connected >it to the motion controller. > >What you really want to do is connect a signal between the _pin_ >"motion.probe-input", and the parport pin. That signal needs a name, >but I strongly recommend that you do not use either pin name for the >signal, it just leads to confusion. Lets call the signal "probe". >The following commands create the signal, connect it to the motion >controller, and connect it to the parport, in that order. > >newsig probe bit >linksp probe motion.probe-input >linksp probe parport.0.pin-10-in Gotcha. >In version 2.1.4 or CVS head, there is a shorthand command to do >this, called net. You give the signal name first, then the pin(s) >that you want the signal to connect, like so: > >net probe motion.probe-input parport.0.pin-10-in And this goes in the standard_pinout.hal file? I'll find out. :-) > >Hope this helps, I believe it will, when I get to the machine, many thanks John. >John Kasunich -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Here is a test to find whether your mission on earth is finished: if you're alive, it isn't. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
