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5. Reference design
5.1 UARTinterface design
For 3.3V power supply equipment, the serial port of equipment and module can be directly
connected to complete communication according to the circuit shown in Figure 7.
Table 4 Circuit diagram
（
3.3V
）
For 5V power supply equipment, refer to the circuit shown in Figure 8 or design relevant
level conversion circuit. The resistance value can be adjusted according to the actual circuit.
