Hi Yes, every other wire grounded. As you look at the connector all the pins on one side are grounded.
Bob On Oct 21, 2012, at 8:24 AM, shali...@gmail.com wrote: > Charismatic impedance, he? > > Was that with one wire for data and the two neighboring wires as ground? > > Didier KO4BB > > Sent from my Droid Razr 4G LTE wireless tracker. > > > > -----Original Message----- > From: Bob Camp <li...@rtty.us> > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Sent: Sat, 20 Oct 2012 7:31 PM > Subject: Re: [time-nuts] Are serial port headers standardized? > > Hi > > I do believe I can top that one :) > > Back in the 70's (do I need to mention jobs …) these were already an > established item. Before that point (as in back in school … don't ask when > that was) I spent some time modeling the charismatic impedance of the > connector plus cable combination. Turns out that 120 ohms is a pretty good > match… > > Bob > > > On Oct 20, 2012, at 2:42 PM, Magnus Danielson <mag...@rubidium.dyndns.org> > wrote: > >> On 10/20/2012 04:15 PM, Sarah White wrote: >>> On 10/20/2012 10:06 AM, Bob Camp wrote: >>>> Hi >>>> >>>> The IDC to 9 pin cables are a generic / cheap item on eBay or from Newegg. >>>> Less than $3 delivered last time I needed any. >>>> >>>> Bob >>> ((...snip...)) >>> >>> Motherboard manual said: >>> "Connect one side of a switching cable to the header and then attach the >>> serial COM device to the other side of the cable." >>> >>> ... is "IDC" another way of saying this? what does the acronym represent? >> >> IDC block header is a more correct term as I recall it. Wikipedia concurs: >> http://en.wikipedia.org/wiki/Insulation-displacement_connector >> >> Back in the 80thies when I had my first job, these 10-pin IDC block header >> serial cables was already an established standard. If you have hard serial >> interface on your motherboard, be lucky, plug it in and run! >> >> Cheers, >> Magnus >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
