On Wed, 2006-05-31 at 12:14 -0600, Philip Prindeville wrote: > Tim wrote: > > On Tue, 2006-05-30 at 21:25 -0600, Philip Prindeville wrote: > > > >> I'm running FC3 on an MSI-7142 (K8MM-V motherboard), and using > >> the two serial ports on the m/b. I used the stock > >> out-of-the-shrinkwrap settings for most hardware (except for the sound > >> board and X drivers), and things have worked fine. > >> > >> But... when connecting to a router's console at 115200 with either > >> RTS/CTS or XON/XOFF flow control, I'm seeing dropped characters. > >> > > > > Looking at a friend's router, his one's serial port connection *ONLY* > > had the three-wire type of serial connection. So his couldn't possibly > > use hardware handshaking (RTS/CTS). Perhaps yours can't too? > > > > Also, check what your router says about its maximum port speeds and > > handshaking protocols. > > > > > > It is an 8-wire connection (over RJ-45 to DB-9), and can do 115200 (max > rate) > with either XON/XOFF or RTS/CTS. > > I've tried both, and they're both lossy. > > The issue is on the PC as the receiver... Remember that both ends have to agree on the flow control. If one is running RTS/CTS and the other is XON/XOFF, you don't have flow control. At 115K, I'd always opt for RTS/CTS...XON/XOFF requires CPU intervention unless you have fairly sophisticated hardware. All you have to do is be a bit pokey at responding to an interrupt and you'll drop characters. RTS/CTS is usually done at the hardware level and is a bit more reliable. ---------------------------------------------------------------------- - Rick Stevens, Senior Systems Engineer rstevens@xxxxxxxxxxxxxxx - - VitalStream, Inc. http://www.vitalstream.com - - - - Blech! ACKth! Ooop! -- Bill the Cat (Outland) - ----------------------------------------------------------------------
