docs/69225: PATCH-Serial comms chapter has wrong acronym for Transmit Data
wblock at wonkity.com
Sun Jul 18 13:29:03 UTC 2004
On Sun, 18 Jul 2004, Marc Fonvieille wrote:
> On Sun, Jul 18, 2004 at 12:00:52PM +0000, Giorgos Keramidas wrote:
> > On 2004-07-17 22:40, Warren Block <wblock at wonkity.com> wrote:
> > > --- /usr/doc/en_US.ISO8859-1/books/handbook/serialcomms/chapter.sgml Sat Jul 17 06:22:19 2004
> > > +++ chapter.sgml Sat Jul 17 22:37:04 2004
> > > @@ -978,11 +978,11 @@
> > >
> > > <itemizedlist>
> > > <listitem>
> > > - <para>Transmitted Data (<acronym>SD</acronym>)</para>
> > > + <para>Transmit Data (<acronym>TD</acronym>)</para>
> > > </listitem>
> > Actually, the LED that shows transmit line activity in my modem is
> > labelled "SD". Perhaps, we should change the description text to "Sent
> > Data" instead?
> SD is on the modem, the text is talking about a RS232 cable: "A standard
> RS-232C serial cable should suffice as long as all of the normal signals
> are wired:"
> I'd change SD for TD which is the correct term in our case (or TxD, but
> in this case RD must be changed for RxD). TD is the data transmitted by
> the DTE (our computer) to the DCE (modem), RD is data to DTE from DCE.
> These descriptions come from a time where half duplex was common.
> s/Transmitted/Transmit/ etc. is not mandatory, in fact both versions are
You're right, but I'd never seen the "Transmitted" form until a web
search this morning.
> So I'd keep the description but I'd s/SD/TD which is correct.
Now that I look at it more, TxD/RxD are used earlier in the chapter, and
are the more correct way to go. I think these are probably how they are
listed in the EIA spec.
As for the description changes, I suggest those changes for consistency
with the other pin descriptions. If you have Transmitted Data, you
should also have Data Terminal Readied, Carrier Detected, Signal
Grounded (okay, maybe not that one 8-).
-Warren Block * Rapid City, South Dakota USA
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