In SX Microcontrollers, SX/B Compiler and SX-Key Tool, lboucher wrote:

Hi

Thanks for the responce.
126 is handled by the software on the computer.
The computer will never send the value 126 unless it is a Sync Byte
This is part of the renard protocol.

As for bytes past dimmer 17.
My setup works a bit different than others.
A "Packet" in my setup is:
1 Sync, 1 other byte, and (17 * 6) dimmer values  for a grand total of 104 bytes.
(The other byte is a part of the Renard protocol i don't use.)

So 104 bytes come out of the computer ever "Event"
The first unit receives all 104 bytes, strips off the first 17 dimmer values and sends everything else downstream.
So the 2nd unit sees 87 bytes, and on and on until the last unit only sees 19 bytes.
(Make more sense, i did a horrible job describing that in the first post.)

Overall i feel pretty confident about everything except the assembly code.
You might be very correct about noise, i am sending ttl level serial unshielded over sprinkler wire >30 feet.
Bad i know, but it worked and was super cheap.
It just seemed odd that noise would show up in such a pecular fashion. I would expect noise to be a persisten problem regarless of number of stop bits, or dimmer value sent.

If no one points out an issue in the assembly i am thinking i will hack off all the excess length on the cables i can for next year and see what happens. Probably re-program all the chips to, just to make sure i have the exact some firmware on each.

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