[time-nuts] 57600 baud rate with Basic etc

shalimr9 at gmail.com shalimr9 at gmail.com
Thu Oct 11 06:25:12 EDT 2012


Most computers and RS-232 interface chips made in the last 10 years support 0-5V as well as +/- 12V.

Didier KO4BB

Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: Bob Camp <lists at rtty.us>
To: 'Discussion of precise time and frequency measurement' <time-nuts at febo.com>
Sent: Wed, 10 Oct 2012 11:09 AM
Subject: Re: [time-nuts] 57600 baud rate with Basic etc

Hi

Again, I'd say it's the lowest common denominator. Synchronous comm using
RS-232 levels on a DB-25 came before asynchronous comm. It's long dead.
Being first isn't *always* best. Same could be said of 125V / 60 ma current
loops. I suspect serial will easily outlive RS-232 levels though. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Michael Tharp
Sent: Wednesday, October 10, 2012 11:55 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] 57600 baud rate with Basic etc

On 10/10/2012 11:49 AM, Bob Camp wrote:
> No easy solution. Serial com is still with us because it's a lowest common
> denominator. I'm sitting here coding it into a new product right now (once
> the uber super compiler finishes a build). It's supported on just about
> every chip set in the universe. I suspect it will outlive the cockroaches.

Basic serial has its merits, but it's regrettable that RS-232 came out 
on top. RS-422 (or full-duplex RS-485, not much difference) would have 
been a much better choice. Differential so it has good noise resistance, 
and it doesn't use weird voltages (-12V? come on...)

It all looks the same from the software side though. Bytes in, bytes out.

-- m. tharp

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