Warm prompt:Most of the modules of the store only to provide a description of the introduction or to send information， there is no technical advice and support， please take a careful beginners.

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Voltage range: 3V~5V

The highest baud rate: Recommend not higher than 120kbps

Size: 9.4 mm * 15.9 mm

Below module is a negative figure， on both sides of the power supply is connected together， just side can be connected， both sides are independent of the two channels， can use arrows indicate signal flow， to illustrate is the input， out that is the output， RS232 character is located near the end as RS232 level near the end character TTL TTL level