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Hi, I wish to share my analisys of start-sequence data exchange of HU-CDC in Excel.
There is also the useful column CrcCheck that can help to correct rx errors.
The errors can be due to some noise in power supply, or the resistor divider mounted too far from max232 pin. Try to filter +5V of max232 with a couple of capacitor 10uF+0.1uF.
Best Regards
Ale
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