08-26-2016, 07:55 PM
(This post was last modified: 08-26-2016, 08:58 PM by MarkHaysHarris777.)
Even the one's that do not provide the jumper are useful. The PL2303 based devices have a voltage reference on pin(4) of the PL2303 chips. If this is set to 5v the device (Tx & Rx ) will operate at 5v. If the pin(4) reference is held at 3v3, the device (Tx Rx ) will operate at 3v3. The PL2303 devices that have 5v on pin(4) can be used; but, first the user needs to move the 5v ref on pin(4) to a 3v3 ref (usually found on the same board). Obviously the devices that have a jumper are sweet because the config happens without and solder. 
The 954 device from ada fruit is handy because it is factory preset for 3v3 operation; but, the red lead is still designed to run at 5v-- for use with powering Arduinos or other devices. That lead is not strong enough to power the Pine board.
The 954 device from ada fruit is handy because it is factory preset for 3v3 operation; but, the red lead is still designed to run at 5v-- for use with powering Arduinos or other devices. That lead is not strong enough to power the Pine board.
marcushh777 
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please join us for a chat @ irc.pine64.xyz:6667 or ssl irc.pine64.xyz:6697
( I regret that I am not able to respond to personal messages; let's meet on irc! )