u-blox SARA-G3 Series System Integration Manual page 51

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SARA-G3 series - System Integration Manual
TXD signal behavior
The module data input line (TXD) is set by default to the OFF state (high level) at UART initialization.
The TXD line is then held by the module in the OFF state if the line is not activated by the DTE: an
active pull-up is enabled inside the module on the TXD input.
UBX-13000995 - R06
Objective Specification
System description
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