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The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024


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Re: [Project] Lights was Foundations are in!


  • To: ukha_d@xxxxxxx
  • Subject: Re: [Project] Lights was Foundations are in!
  • From: patrickl@xxxxxxx
  • Date: Sat, 02 Jun 2001 21:39:15 -0000
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

--- In ukha_d@y..., "Keith Doxey" <ukha@d...> wrote:
> The reasons for RS485 are...
> BiDirectional Comms over 2 wires
> Balanced therefore 99.9% immune to interference
> Multidrop - can support 32 devices on the bus

I've never come across this limitation - what does it arise from?

> Single +5V supply

I thought RS485 was usually implemented over V24 style
physical/electrical just like RS232?

> the reasons against RS232...
> BiDirectional comms requires 3 wires Tx,Rx,GND
> Not immune to interference
> Point to Point only so would need 1 RS232 port per attached device

It doesn't have to be - it can be driven open collector... but I get
the point.

Patrick




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