On 18/10/11 13:30, g wrote: > On 10/18/2011 04:42 PM, Bob Goodwin wrote: > <> > >> Ok I've added "dialout" but still don't see a change in voltage, >> on the second computer it sits at -11+? I logged out/in, perhaps >> a reboot is required? I'll try that. > "what we have here is failure to communicate". 8-D > > both, on your part and on part of computers. > > what you have not communicated, are you connecting to a modem, or to > another computer? > > if 2 computers, they *may not communicate*. that is, *not without* a > "null-modem" connection. > > for a decent understanding of rs-232 operation, see; > > http://www.arcelect.com/rs232.htm > > where you will find what you need for understanding of an rs-232 connection > using either a db25 or db15 connector and how to make a "null-modem" > between the 2 computers. > > > hth. > > > No that doesn't help! The internet is full of words on how to > connect two computers via serial ports. > > I have an application that should toggle DTR and RTS and I want to > see that at the end of an unterminated cable. I have tried to do > that on two F-15 64 bit computers, a Dell and an HP, in both cases > the port sits high negative ~-12 volts dc. > > I guess the only thin I may have that I could tie to a serial port > would be an old dial ip modem if I can find it. I don't even have > a wired telephone line, cell phones only in this house. But the > modem would do for testing. Or I could cut up this serial cable > and make a null modem cable out of it if necessary, that might be > easier ... > > All suggestions welcome at this point. > Brian, I assume the one connector on the back of both computers will be seen as ttyS0. FLDigi is set to ttyS0 I also tried psk31lx and it does not toggle the serial outputs either so that makes it look like a computer configuration problem rather than either PSK application. > . > > Bob > > -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
