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RS232-TTL Converter
his module is plug and play. It does not need driver. you can change RS232 levels to TTL level easily.
Module has two lights which are receive indicator and transmit indicator. They will flash when receiving or sending data.
How to test RS232 module
Connect the module to computer serial port
Use wire to make send and receive pins shorted
Connect 3.3V or 5V power supply between VCC and GND
Open serial port debugging assistant on the computer and send data manually (not send files).
