Dave I appreciate your response and you may well have answered my question very well..Hehehhheh Honestly there is some stuff in your response that I didnt understand but I've printed it out to read later when the morning caffiene kicks in. . Just a casual observation..I am a machinist. I already have and use a cnc mill.I have 20 years of (hobby)electronics experience, have repaired hundreds of electronic circuits and built a few--but I am sorta lost in this project , nothing in my experience quite prepared me for this..Seems having computer geek in one's resume would be worth more than all my experience thus far.If I actually get this thing working I am gonna brag about it for years.Hehhehehheh Steven > > > > Hey but I got a question..Bad need an answer to this'un.I want to > > buy a breakout board but am confused by the language used to > describe > > them. > > I can't speak directly to Bob's breakout board because I have never > used one. > > What it offers is an onboard power supply and I like the PC power > supply. > > It also offers manual movement of the axis. Again, I never plan on > doing manual movement so it is not something that piques my interest. > > since I made my own board, I just did a little research into what I > needed. > > I'm using Geckos for one machine and a Xylotex on another and my own > super simple full step on a third. > > The Gecko's have on-board optos so the output pins for those are not > isolated. redundancy is not needed. > > I also used relays for my outputs to other relays. So, I used > seperate 2N222 transistors to drive DIP on-board relays. That too > did not need optos. > > That leaves the 5 inputs, the e-stop, home and end switches. And > there I realized I'd have low voltage running next to high voltage. > Opto's are deffinatly needed. > > That brought out every line from the Parallel port to an end device. > > Pins 2 thru 10 are the outputs for the steppers. non optoisolated. > Check your Rutex drives to see if isolation is needed. > > If you are running solid state relays, check those specs to see if > they are optically isolated. > > And use some isolation for the inputs. H11AA optos are AC so you > don't have to worry which way you connect the wires. > > I chose to use parts on hand so I brought 5 and 12 V from the PC. 5 > for the logic and 12 for the relays I had. > > I thought about making a cheap breakout board, but it seems like it > would have to be about $50.00 even for a bare bones version. > > If I make another one, it will have transistors on the outputs > instead of relays. Since I'm driving external relays anyway, the > redundancy is not worth the cost of relays. Espically for board > space. > > I think some has a db25 connector to a set of screw terminals with no > anything between. That too makes a simple way to get the wires out > to the driver box. > > I'm not sure if I answered your questions, but hope you can use some > of that informaton. > > Dave
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