The RS232 to TTL conversion shield is specially designed for UNO R3 control board, very convenient to change the serial port into the RS232 interface.
The shield comes with a DB9 connector（male head）, easy to connect various RS232 interface equipment. It also comes with a RS232 pin header for connection and debugging.
It even comes with a soldering area for DIY design, so you can make full use of this shield. On the shield there is a programming mode control switch; turn OFF for burning the program to UNO R3; turn ON for normal use.
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Power supply: DC 5V
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Comes with 16 digital IO pins（with an I2C pin）
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Comes with 6 analog IO and power
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Comes with a run/programming switch
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Comes with a transmitting, receiving indicator and D13 indicator
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DB9 connector（male head）、RS232 pin headers
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Soldering ares
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Comes with a Reset button
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Dimensions: 60*53.4MM
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Environmental properties: ROHS