OK looking at the data sheet for the max 235, it has 232 ins and TTL/CMOS outputs, if I use this couldn't I keep my voltage levels right ? It appears as though it's taking the +- 12v and outputting TTL. Keith --- Keith Christopher wrote: > but the 232 operates in the 5v range, what if I put > 3 > 232's one on each computer and use the AND gate. > this > should keep the traffic @ 5v level correct ? > > > > --- Jinx wrote: > > > I want to be able to select, this is where the > PIC > > > comes in. I want the PIC to listen and if it > sees > > a > > > special key sequence it will turn off one of the > > tx/rx > > > AND gates and turn on the other tx/rx AND gates. > > > Allowing communication to the other computer. > > > > A possible problem is the signal voltage. If your > > PCs > > are using +/- 12V levels (ie not 5V) then you > won't > > be > > able to pass the comms through a standard gate. If > > you can get a +/- power supply from the MAX chips > > it's > > possible you could use 4066's or 4052's to select > > and > > route the signals > > > > -- > > http://www.piclist.com hint: The PICList is > archived > > three different > > ways. See http://www.piclist.com/#archives for > > details. > > > > > > > __________________________________________________ > Do You Yahoo!? > Send your FREE holiday greetings online! > http://greetings.yahoo.com > > -- > http://www.piclist.com hint: The PICList is archived > three different > ways. See http://www.piclist.com/#archives for > details. > > __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.