CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Figure 3-14 Full-featured UART port design
If you need to use a 4-wire UART port, you can refer to the following connection methods.
Figure 3-15 Four-wire serial port design
The serial port of the module is 1.8V level. If the serial port needs to be connected to a 3.3V
level MCU, you need to achieve level matching through a level conversion chip. The chip
connection method can refer to the following circuit
：
