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PICList Thread
'[EE] Re: RS485'
2005\08\23@115718 by Vasile Surducan

face picon face
On 8/23/05, Mauricio Jancic <spam_OUTinfoTakeThisOuTspamjanso.com.ar> wrote:
> I've always used RS-422, but never RS485. I'm having doubts, because in the
> scheme that I saw: (attached)
> I see that they connect all the drivers together, so this means that I'll
> have to waste a pin to enable/disable the transmitters I'm not using.

No it's not necessary. Keep all the slave transmitters/receivers in
receive mode and change direction with the transmit line. If this
works for you, you'll need a small hardware delay betwwen transmit and
selection line. This is classic so I didn't invented boiled water.

Vasile


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