And don't forget also Dallas' DS276... Bruce Cannon Style Management Systems http://siliconcrucible.com (510) 787-6870 1228 Ceres ST Crockett CA 94525 Remember: electronics is changing your world...for good! > -----Original Message----- > From: pic microcontroller discussion list > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Bob Ammerman > Sent: Tuesday, October 31, 2000 4:53 AM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [PIC]: PIC SBC requirement > > > Yeah, I'm comfortable enough with transistor driver ports. They would be > especially ok for this application where the RS232 connection can me > measured in inchces. Just don't want to have to come up with a -12 supply. > > Bob Ammerman > RAm Systems > (contract development of high performance, high function, low-level > software) > > > ----- Original Message ----- > From: Dan Michaels > To: > Sent: Monday, October 30, 2000 9:43 PM > Subject: Re: [PIC]: PIC SBC requirement > > > > Bob Ammerman wrote: > > > > > >RS232 in and out (bit bang ok). TTL levels _not_ OK. MAX232 or similar > > >greatly preferred for robustness. > > > > > > > Hi Bob, > > > > Certainly you are correct about using TTL levels for RS-232 > > - ie, 0-5v. But I was wondering about your feelings regarding > > bjt RS-232 ports that produce nominal +5v and -12v. Personally, > > I think having minus-going is pretty crucial. Not too sure you > > gain a lot using +12 over +5v, however, except possibly for > > long wires. > > > > Big advantage of the bjt ports is low-quiescent power reqs. > > I have played with these quite a bit and have always had very > > good luck - using cables to 12 feet and baudrates to 115K. > > > > - danM > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.