The USB to TTL converter is build by PL2303 chip , it's designed for mobile and embedded solutions in mind, with very small power dissipation. Cable length : 1M (3.2ft) Black pin : GND (Ground voltage) Red pin : VCC (3.3-5V) Green pin : TXD (Transmit asynchronous data) White pin : RXD (Receive asynchronous data)
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