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'[Bulk] [EE] Ethernet - Bus?'
2009\05\03@001216 by Isaac Marino Bavaresco

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solarwind escreveu:
> Hey all! So far I am considering the RS485 bus for my inter-controller
> communication system. That's because I understand how RS485 works.
> It's simple and very very flexible. However it seems that ethernet is
> another interesting option. I tried to do more research on it but I
> didn't get very far. (Probably because I wasn't searching for the
> right thing.)
>
> Anyway, my question is: can ethernet be used as a BUS? Like RS485,
> that is - without a hub or switch. I want to be able to hook up
> several microcontrollers with Microchip's ENC26J60 together. Is it
> possible to tie them together in a bus fashion? Or is a
> hub/switch/router required?
>
> How does this work exactly?
>  

The correct answer is: You need a hub or switch.

BUT at least for 10Mbps, the signal supports some distortion/extra loading.
I made some experiments with 10Base-T, adding extra pulse transformers
to a 100m cable run and my devices could communicate.

The transformers were the FB2022 1:1/1:1. I experimented with one and
two transformers between the devices and they worked OK.

I don't think you could make three devices communicate, but perhaps a
third device may monitor the communication of two others.

Regards,

Isaac

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2009\05\03@002414 by solarwind

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Thanks. Looks like I'll stick with RS485. Maxim has some transceivers
that can go pretty fast.

2009\05\03@093730 by olin piclist

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solarwind wrote:
> Thanks. Looks like I'll stick with RS485. Maxim has some transceivers
> that can go pretty fast.

I thought you were reading temperature sensors.  Why do you need "fast"?

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2009\05\03@133317 by solarwind

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On Sun, May 3, 2009 at 9:38 AM, Olin Lathrop <spam_OUTolin_piclistTakeThisOuTspamembedinc.com> wrote:
> I thought you were reading temperature sensors.  Why do you need "fast"?

The controllers at each end read the temperature sensors. I just want
the bus to be fast enough to leave room for options. Besides, this
isn't a professional, mission-critical application. I'm just learning
different things.

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