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RE: RS485
- To: ukha_d <ukha_d@xxxxxxx>
- Subject: RE: RS485
- From: Keith Doxey <keith.doxey@xxxxxxx>
- Date: Tue, 11 Apr 2000 10:14:53 +0100
- 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
Hi Jon,
Take a look at http://www.rs485.com or
more specifically
http://www.rs485.com/rs485spec.html
RS422 uses separate pairs for balanced distribution of Tx and Rx from 1
driver to upto 10 recievers
RS485 uses a single pair for bidirectional data transfer with upto 32
devices on a databus although some manufaturers now have chips which can
have as many as 256 devices on the bus.
As Steve mentioned in another post "Serial Port Complete by Jan
Axelson" is
one of several books mentioned on Jan Axelson's Lakeview Research website
at
http://www.lvr.com/
Lots of useful stuff there too.
Hope that helps
Keith
Keith Doxey
http://www.btinternet.com/~krazy.keith
Krazy Keith's World of DIY Home Automation
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