Re: RS 232 Error Rate
From: CBFalconer (cbfalconer_at_yahoo.com)
Date: 02/11/05
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Date: Fri, 11 Feb 2005 18:16:02 GMT
J Jackson wrote:
> Tosca Berisha <tberisha@uucp.gov> wrote:
>
>> what is an acceptable error rate between 2 RS 232 devices running
>> at 9600 baud, at distance less than 2 meters ( about 6 american
>> feet) using only 3 wires.
>
>> Or, is it guarantied that for such short distances a speed like
>> that is going to deliver the data to the other end.
>
> with modern rs232 hardware etc I'd say you'd have a very very very
> low error rate - infinitessimal. BUT.....
>
> If it is really important, then checksum your data and have some
> retransmission method, or run IP over the link with slip or ppp
> and use TCP for your connection
I once spent a weekend transferring gigabytes over a 115 kBaud link
of roughly that length, with no problems. However I was using
Zmodem protocol to do the transfer. So I don't really know if
transient errors occured, and didn't really care. They certainly
weren't common enough to visibly affect the transfer speed. The
files were all zipped or arjed to reduce transfer time, and no
errors showed up on decompression.
The mantra is "verify, don't guess".
-- "If you want to post a followup via groups.google.com, don't use the broken "Reply" link at the bottom of the article. Click on "show options" at the top of the article, then click on the "Reply" at the bottom of the article headers." - Keith Thompson
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