Specifications

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5. Reference Design
5.1. UART Interface Design
For devices with 3.3V power supply, you can directly connect the device UART port with
module UART port according to the illustration in Fig 12.
Fig 12 Circuit diagram (3.3V)
If your device is powered by 12V, you can refer to the circuit shown in Fig 13 or design your
own circuit for power conversion. The value of resistor can be adjusted according to actual circuit
design.