Talk:Add a Serial port to the ARM9 Linkstation

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This page is confusing. Too high a pictures to words ratio (e.g. not enough description).

If this confuses you, have you considered a simpler project for a start?


  • What is that picture showing under ' Why it is easy to gain serial access on the LS Pro'?

Look at the bottom of your LS Pro and search for a hole! This is the hole where we plug in that special connector. I posted that picture to show how it looks from the inside.

  • I've managed to work out this is a USB-RS232 bridge chip, but we seem to end up with USB connectors at both ends. Huh?

The connector at the end of the LS Pro in fact is just a piece of plastic with 4 pins. it just fitted...thats all.

  • Where does this connect on the LS Pro?

The hole at the bottom.

  • Why are you using a bridge chip if you want to talk RS232 to the LS Pro? Most PC's still have an RS232 port. Use that and you don't need a chip, just some wire.

You still need a level shifter. These USB-Cables are cheaper compared to the components if you buy them alone besides...thats why.

+ Any chance of a circuit diagram? check here

  • What's the pin-out of the board? Guessing from a forum post, the longest trace (rightmost in the board photo) is GND, then going left VCC, TX (as in "data coming from the LSPro", considering it's a DCE), RX (as in "data entering the LSPro"). So the colours in the photo with the usb connector are: Green-GND, Yellow-TX, Orange-RX (as before, considering the LSPRO as a DCE, so TX means out of the LSPro and RX into the LSPro). Am I right?
  • Now that I have a cable (for a C25) I think I inverted TX with RX, the correct sequence (right to left) is GND, VCC, RX, TX - so in the usb connector in the photo Green-GND, Yellow-RX, Orange-TX