Re: Serial Connection
On Sun, 27 Mar 2011 19:30:49 -0400 (EDT), firstname.lastname@example.org wrote:
> On Sun, 27 Mar 2011 14:41:37 -0400 (EDT, Stephen Powell wrote:
>> That's true. But a properly-wired cross-over cable or null modem
>> not only crosses over TD and RD but also crosses over DTR and DSR
>> and also crosses over RTS and CTS. Ground, of course, is wired
>> to Ground. CD is normally tied to DSR on the same side of the
>> interface (on both sides). RI is usually left unconnected.
>> See, for example,
> Yes Stephen that's the "traditional approach". Unfortunately
> there are at least half-a dozen non-standard configurations
> (e.g. permanent RTS, connecting DSR to DTR) which drive RS-232
> people nuts. I agree that the place to start is with your
> traditional cable or with a null modem adaptor (essentially a
> black box that does all the interconnections for you, allowing
> straight through cables from either side to the boxes) but beware
> this may not work in all situations.
I agree. Special situations may require special wiring. As I
said in another post, the devil is in the details.
.''`. Stephen Powell
: :' :