Thread: Serial cable for FT232RL <-> Kindle 4
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Old 10-28-2012, 09:22 AM   #6
geekmaster
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Posts: 6,433
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Join Date: Nov 2011
Location: Multiverse 6627A
Device: K1 to PW3
Quote:
Originally Posted by pepijndevos View Post
Ah, great! I did read that someone thought the K3 ground was not a ground but a flow control.

The K4 serial ground is clearly connected to the ground "trace" that covers large areas of the board. So what is a "good" ground?

By shield cover, do you mean the metal boxes coving some components? There is one close to the serial port, but it seems to be connected to the same ground.
Yes, the metal boxes that cover some components are covers that shield components from radiating or receiving EMF interference (i.e. Faraday Sheild or Faraday Cage). They are connected to ground. The USB cable sheild is also grounded, and if connected to a host PC provides an acceptable alternate ground path. That is why the circuit in the first post was reported to work when the USB cable was connected.
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