Hi..i am a new user here. As per my knowledge many times you would not use the power from the USB-UART converter. The target device will provide power to the UART. All you need to connect is Rx,Tx and Ground. The TTL signals come in different flavors. 5V, 3.3V and 1.7V being common. This is all the more reason why not to use the power from the UART adapter. Put 5V TTL on 1.7V TTL pins and something will fry. Use no power from the UART adapter.
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RE: Using USB Ports to connect a RS232/USB converter