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I have a USB to Serial TTL PL2303HX (Prolific chipset) that I would like to connect to my Pi. My Pi model is 2011.12.

The USB to Serial adapter has 5 PINs labeled as follows:

  • 3V3
  • TXD
  • RXD
  • GND
  • +5V

I received 4 cables with the USB to Serial Adapter (4 female-female dupont connectors).

I've seen various diagrams of the GPIO, but I'm not sure which PINS on the GPIO go to the PINs on the adapter.

Question: Which PINs on the GPIO need to be wired to which PINs on the USB adapter?

Chris Snow
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3 Answers3

6

You only need to connect GND, RXD, TXD

GND => PIN 6

RXD => PIN 8

TXD => PIN 10

John La Rooy
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In addition to John La Rooy's answer, I've also connected VCC (i.e., +5V) to PIN 2. Thus, my Pi receives enough power from my computer to boot from a USB key.

user1448926
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I can tell you the WRONG way. I did as above but also connected the 3v3 pin on the prolific dongle to the 3v3 pin on the pi and apparently it fried the pi. Not sure why. I wish someone would give an explanation.

Jimbob
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