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11
GND
4. Connect to MCU
No.
1
The UART module is TTL level， pls connect to the M CU of TTL..
2
For some M CU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
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Ground
Input
Description（STM8L MCU）
E31-433T17S User Manual
6
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