Sorry, it's the PIC that's overflowing because I'm getting phantom data from the PC. I can't figure out if there is something that runs by default on a PC to keep the serial connection alive or what. On 11/17/06, Carl Denk wrote: > > I have a PIC feeding either a XP PRO SP2 or ME 2nd edition at 9600 Baud > over RS-232. The ME running Telix (an old DOS program), the stuff > scrolls very quicky. Using Telix on the XP the scrolling is much slower. > Using REALTERM on the XP there is no indication of overflow, but > scrolling is similar to Telix on the same machine. Don't have a good > explanation, but do know 9600 will scroll fast if allowed. I don't use > Hyper term. I don't use hardware or Xon/Xoff flow control. Wish Gary > Kildall ethics had prevailed and we would had solid O/S for IBM. Have > you tried adding some delays to slow down the PIC? My application is > watching 2 pressures and one temperature, and pushing it out a fiber > optic link to RS-485 to a PLC, the readings don't change that quick, > where once a minute is fine, so speed isn't an issue. The 9600 is > default for the PLC. > > Shawn Wilton wrote: > > I'm having issues communicating with an XP PC over RS232. > > > > I know my code is good because I can communicate via serial using one of > > those USB-UART chips. But when I hook this PICDEM+ to the PC via a > genuine > > RS232 serial port, I constantly get an overrun error. I looked at the > data > > in the debugger and I'm getting "."(0xC3) constantly. Apparently faster > > than the uC can handle the packets. > > > > Any ideas where the data is coming from? There's nothing running on > that > > serial port in terms of s/w. Perhaps someone else has seen this or has > an > > idea what's going on? > > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- Shawn Wilton (b9 Systems) http://b9Systems.com <- New web page -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist