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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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