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Sci.Electronics.Basics -> how to do it? RS232

There are 23 messages in this thread.
You are currently looking at messages 20 to 23.


Author: john jardine
Date: 20:15 19-11-06



"HKJ" <henrik.k.jensen@miscel.dk> wrote in message
news:456094a2$0$183$157c6196@dreader1.cybercity.dk...
[...]
>
> It is already there, use the "System, Preferede component" page to
> select it.
> http://www.miscel.dk/MiscEl/miscelPreferedComponents.html
>
> In the System menu your also have a search function, that can be used to
> locate the correct page to do something. Write E96 in it at it will tell
> your to look at the "Prefered component" page.

Thanks. Spotted it just after posting. Looks like my "ignore previous post"
post, went to that big bit bucket in the sky.
john



--
Posted via a free Usenet account from http://www.teranews.com
Author: Rich Grise
Date: 21:11 20-11-06

On Sat, 18 Nov 2006 21:08:41 -0500, Jerry Avins wrote:

> Jerry Avins wrote:
>
> From provate email. because I don't see it here:
>
> Patrick Klos wrote:
> > To: jya@ieee.org
> > Subject: Re: how to do it? RS232
> > Newsgroups:
>
comp.robotics.misc,sci.engr.control,sci.electronics.basics,alt.engineering.electrical,sci.
electronics.design
> > In-Reply-To: <f8udnWF5wKqDpMLYnZ2dnUVZ_tCdnZ2d@rcn.net>
> > References: <1163863612.012437.59900@e3g2000cwe.googlegroups.com>
> <hqGdnSs2ZtLdtcLYnZ2dnUVZ_s2dnZ2d@adelphia.com>
> <pJ6dnYD4NK_ns8LYnZ2dnUVZ_q-dnZ2d@rcn.net>
> <9NG7h.10349$Fv1.4670@newsfe2-win.ntli.net>
> > Organization: Klos Technologies, Inc.
> > Cc:
> >
> > In article <f8udnWF5wKqDpMLYnZ2dnUVZ_tCdnZ2d@rcn.net> you write:
> >> PeteS wrote:
> >>
> >> ...
> >>
> >>> Minor correction; a marking line is -3 <> -15V (logical 1) :)
> >> Of course. Sometimes my head gets stuffed with current loop facts.
> >>
> >> Thanks.
> >
> > Correct me if I'm wrong, but I'm pretty sure the serial bits are
> > transmitted LSB first? Your picture gave the impression that MSB
> > is sent first. Am I remembering that correctly?
> >
> > Patrick
> > =========== For PPP Protocol Analysis, check out PacketView Pro!
> ===========
> > Patrick Klos Email: patrick@klos.com
> > Klos Technologies, Inc. Web: http://www.klos.com/
> >
> ============================================================================
>
> Patrick,
>
> These followups belong in the newsgroup with the rest of the thread. The
> most significant bit is sent first and appears on the left of the scope
> trace. http://francis.courtois.free.fr/jc1/serial/Basics/RawSignals.html
> might be helpful

Oddly, the spec specifically says that it doesn't care what the bit order
is, or parity, or even bit rate.

So, I'd pick a handy UART, and see which way they do it. ISTR always
hearing "low bit first", but according to the spec, it's the user's
call.

Cheers!
RIch
Author: Jerry Avins
Date: 23:16 20-11-06

Rich Grise wrote:
> On Sat, 18 Nov 2006 21:08:41 -0500, Jerry Avins wrote:
>
>> Jerry Avins wrote:
>>
>> From provate email. because I don't see it here:
>>
>> Patrick Klos wrote:
>> > To: jya@ieee.org
>> > Subject: Re: how to do it? RS232
>> > Newsgroups:
>>
comp.robotics.misc,sci.engr.control,sci.electronics.basics,alt.engineering.electrical,sci.
electronics.design
>> > In-Reply-To: <f8udnWF5wKqDpMLYnZ2dnUVZ_tCdnZ2d@rcn.net>
>> > References: <1163863612.012437.59900@e3g2000cwe.googlegroups.com>
>> <hqGdnSs2ZtLdtcLYnZ2dnUVZ_s2dnZ2d@adelphia.com>
>> <pJ6dnYD4NK_ns8LYnZ2dnUVZ_q-dnZ2d@rcn.net>
>> <9NG7h.10349$Fv1.4670@newsfe2-win.ntli.net>
>> > Organization: Klos Technologies, Inc.
>> > Cc:
>> >
>> > In article <f8udnWF5wKqDpMLYnZ2dnUVZ_tCdnZ2d@rcn.net> you write:
>> >> PeteS wrote:
>> >>
>> >> ...
>> >>
>> >>> Minor correction; a marking line is -3 <> -15V (logical 1)
:)
>> >> Of course. Sometimes my head gets stuffed with current loop facts.
>> >>
>> >> Thanks.
>> >
>> > Correct me if I'm wrong, but I'm pretty sure the serial bits are
>> > transmitted LSB first? Your picture gave the impression that MSB
>> > is sent first. Am I remembering that correctly?
>> >
>> > Patrick
>> > =========== For PPP Protocol Analysis, check out PacketView Pro!
>> ===========
>> > Patrick Klos Email: patrick@klos.com
>> > Klos Technologies, Inc. Web: http://www.klos.com/
>> >
>> ============================================================================
>>
>> Patrick,
>>
>> These followups belong in the newsgroup with the rest of the thread. The
>> most significant bit is sent first and appears on the left of the scope
>> trace. http://francis.courtois.free.fr/jc1/serial/Basics/RawSignals.html
>> might be helpful
>
> Oddly, the spec specifically says that it doesn't care what the bit order
> is, or parity, or even bit rate.
>
> So, I'd pick a handy UART, and see which way they do it. ISTR always
> hearing "low bit first", but according to the spec, it's the user's
> call.

The spec doesn't call out a particular connector, either. It must have
25 pins, though, of either sex. RS-232C and later specify a slightly
positive threshold and voltage limits that allow TTL to just meet spec
for short quiet lines. The receiver must withstand at least +/-15 volts.
There is (was?) no rise-time spec. All that is convention.

Jerry
--
Engineering is the art of making what you want from things you can get.
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