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It was 64MHz at 115,200 with a checksum that always balanced.

I can't explain it but it worked. But I'm going to do intensive testing soonday and report back here.

Robert

Weird, nothing unusual came up when I was doing my tests back then; no bytes lost, no data loss. I'm going to have to test this with a higher volume of data transfer and add the polling of TXIF as...

Nope, not my video. That's Jose's and he uses transistors. I preferred a software solution, no extra parts involved.

All Slaves keep their TX line disabled until they are spoken to by the Master...

Sorry for the delayed reply to Wilton.

Yes, a MAX232 chip on each PIC will work. It will also improve reliability over long distances (can't remember if this was from a Microchip datasheet of...

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

How fast a baud rate do you think this can handle?

Can't comment on the diodes, but disabling USART also turns off receive. That's why I disabled only transmit.

I have only 1 slave enable the TX line at one time:
http://www.picbasic.co.uk/forum/showthread.php?t=17282&p=116809#post116809

Robert

This post is for the next guy that tries to do this. A few things I learned:

- you can put a basic MAX232 on the TX and RX lines and "watch" what is being sent around your network.
- 4K7 pull-up...

Thank you.

Your replies sent me on search for "rs232 multidrop" and that gave important note.

"One Master PIC can talk to multiple slaves, but only 1 slave can connect back to Master RX."

I...

Hi,

This is what my circuit looks like:

6709


- The 18F4550 sends 1 byte to the slaves on Master TX line.
- Both slaves receive the byte properly.
- 1st slave replies successfully with...