> > I have 3 micro controllers 1 master and two for the
> > slaves. I have to control for the slaves to acquire data.
> > I use the USART of PIC16F877.

Olin wrote:
>How are they wired together?  You can't just connect two TX lines from two
>UARTs together.  Are you using RS-485?

The OP did say he was using power-line modems. (data over mains wiring)
There is a minimum turn around time on some of these.
Regards...

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