Thanks, Denny.. The MCP2561 looks suitable at a decent price. Never worked with CAN so it didn't get past my mentals clerosis. __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb *Sent from my etch-a-sketch* On 22 October 2017 at 19:16, Denny Esterline wrote: > Look into CAN bus. > Even if you just consider mis-using the CAN transceivers and physical > layer, there's some really interesting possibilities. > > On Sunday, October 22, 2017, David C Brown wrote: > > > I am playing about with some home automation. I am looking towards a > > multimaster bus using a balanced transmitter and receiver such as RS485= .. > > > > Now I well understand how to handle the collision detection in software= : > I > > have done that in the past. But in the past I used open collector TTL > on a > > single ended bus. > > > > That is not adequate in the present application because I am looking at > > distances up to 25 metres.(at a maybe 10KB) > > > > So the question is: what chips can drive the balanced line yet survive > > contention without cooking > > > > > > > > __________________________________________ > > David C Brown > > 43 Bings Road > > Whaley Bridge > > High Peak Phone: 01663 733236 > > Derbyshire eMail: dcb.home@gmail.com > > SK23 7ND web: www.bings-knowle.co.uk/dcb > > > > > > > > > > *Sent from my etch-a-sketch* > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .