Issue#3849 fix backported to 2.9#3857

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JTrantow wants to merge 3 commits intoLinuxCNC:2.9from

JTrantow:2.9_Issue3849

Commits on Mar 10, 2026

Issue#3849 fix backported to 2.9
JTrantow
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Back to original voodoo caused by conflating modbus timing calculation with pktuart hardware implementation.
JTrantow
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Commits on Mar 11, 2026

Fix msg and reverse (baudrate > 19200).
JTrantow
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