Update PROTOCOL-PDO.md

[hsmade]

-1 doesn't exist in UINT, so I converted them to what the value would be in the respective UINTs

[denmaus]

I must admit that at least 4294967295 looks like a magic number.
Is not possible to use a more intuitive and clear syntax: 0xFF for 8 bit and 0xFFFF for 16 bit numbers?

[michaelarnauts]

I agree with @denmaus, while you are technically correct that it's impossible to specify a negative number with an unsigned int, it does make it more clear what the values mean by just indicating a negative number.

I prefer this clarity. Maybe a note below the table to indicate this might be better?

[hsmade]

Maybe: -1 (0xFFFF) ?

[michaelarnauts]

Maybe: -1 (0xFFFF) ?

That's also fine I guess :)

[michaelarnauts]

Thanks for this. Closing it out, for two reasons:

• The diff is based on an older version of PROTOCOL-PDO.md (it predates the 6=boost value that's since been added) and now conflicts with the current operating-mode row.
• The change is really a signed-vs-unsigned representation choice (-1 vs 255 for the same byte). I'm keeping the signed convention (-1=auto, etc.) for consistency across the doc.

Appreciate the contribution regardless — thanks!

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