Multiple PICs on usart network

[Demon]

I needed 115200 at 48mhz, not sure diodes could handle it. Switching coms in software doesn't add hardware limitations.

[timmers]

Attached is a pdf schematic similar to Jose P's posting, but halving the number of transistors per channel.
Also need to add a TX BUSY bus to prevent collision. (Hold to ground when transmitting, tristate when idle).
A similar circuit ran fine at 115200 baud.

Almost any signal diode in series to the TX pins (cathode to the TX pin) with a bus pull up resistor on the anode could also work fine.

Tim.

[prstein]

Hey Everybody,

Thanks for this thread, you saved me a truckload of frustration! The series diodes worked in my case.

All the Best,
Paul

[JoseJimenez]

Look guys,
My schematic use 2 transistor and 3 Rs per tx line. You dont need any other ic as converter or similar.
I am mounting 4 PIC forming a network, 1 master and 13 slaves. Tx from master will be conected to all Rx of slaves, then all Tx from slaves will be conected to master Rx.

Anyway, looks like demon have resolve this...

/jose p