Serial Console for the Rock64

[MarkHaysHarris777]

Thanks :-)
Also, from Mark's description I understand that actually only 3 wires are needed (Console Tx/Rx/GND <-> ROCK64 Rx/TX/GND) and that the 5v/3.3v wires should remain disconnected.
Did I get it right?

Yes,  just three wires;  what may have confused you is that you will see 'four'wires in my pic;   that is because I have used two  pairs.  But,  one wire in each pair is a ground wire...  and the two ground wires are tied together at each end...  so electrically there are only three wires  (Tx-->Rx)   (Rx-->Tx)    ( ground )

   

In the pic above I have tried to make this more clear;  the three lines from the Rock64 are:

brown:  (ground)

orange: (Tx-->Rx)    from the perspective of the Rock64

yellow:  (Rx-->Tx)    from the perspective of the Rock64

I have used two pairs:  
    blue pair (the striped white is ground)  stripe is also blue
    brown pair  (the striped white is ground)   stripe is also brown

1)   yellow wire from the Rock64 is connected to the solid brown wire of the cable.

2)   orange wire from the Rock64 is connected to the solid blue wire of the cable.

3)   brown wire from the Rock64 is connected to the ground wires of the cable ( both striped & tied together at each end )

Hence,  three wires.  In the case of using a serial bridge cable you will also have three wires ( and all three wires are required if you want a reliable sound uart serial connection.