----- Original Message ----- From: "Ian Bell" To: Sent: Friday, September 26, 2003 2:21 AM Subject: Re: [EE:] rs232 line into digital I/O port??? > On Friday 26 Sep 2003 1:15 am, you wrote: > > > Ian, > > > > Great! Thanks for asking. > > > > Other end of the link will either be a PC running a terminal emulator, or a > > PDA with a +5.5/-5.5 volt serial port. > > Here is you first problem. From other posts on the topic of (RS232) serial > ports we know that most PCs will accept a 0/5V serial signal but what about > this PDA of yours with it +5.5/-5.5V serial port? receiving from it should > be no problem but what signal levels does it expect you to send it? Can you > find out? I can find out, but will not be able to until Monday or Tuesday. > > > > > The length will be 3 feet. 6ft would be great if possible. > > OK, fairly short then, so as a rough guess we can assume 100pF/yd cable > capacitance so design for more than 200pf load. > > > > > Data rate of 9600 is fine, but of course, higher would be nice. > > > > 9600 is nice and slow so cable capacitance should not be too much of an issue. > How much higher do you want to go? 14400 would be nice. 19200 would be grand. But 9600 is fine. > > Ian > Thanks John > -- > 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.