Em 9/7/2010 05:01, solarwind escreveu:
> Another idea is to make a very very simple RS485 hub using (almost
> nothing but) MAX485 type chips. One can connect the the output of each
> chip to the input on all the other chips. This way, anything
> broadcasted by one node will be sent to every other node. However,
> what are the issues with this. Also, how does one terminate the line
> in this case?
>


If you tie the input of every IC to the outputs of every other ICs, and
vice-versa, you will end with all the inputs and outputs tied together
and you have a half-duplex system.

If the device is a hub, far away from the boards, you will need an extra
wire from each board to switch between transmitting and receiving.


Isaac

__________________________________________________
Fale com seus amigos  de gra=E7a com o novo Yahoo! Messenger =

http://br.messenger.yahoo.com/ =


-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist