Getting DCU-11 cable to work with a Sony Ericsson K300i

Published November 7th, 2005

As mentioned in a previous entry, I’m looking to learn J2ME for programming mobile ‘phone apps. In order to connect to my Sony Ericsson K300i, I originally bought a DCU-11 cable to connect to the ‘phone over USB (although I’ve since bought an infra-red connector instead).

It worked find to start with, allowing me access to the ‘phone’s file system to download pics and videos. I could also run the Device Explorer (via the Connection Proxy) that comes with the J2ME SDK, in order to install, run and debug my MIDlets. But it didn’t last long: for some reason, at some point (I’m not sure when, I updated several bits of software over several days) it stopped allowing me to connect with the Device Explorer. I could do the file transfer OK, but I couldn’t connect to the ‘phone for testing my code any more. I kept getting errors like this:

“Device Explorer detected a hanging connection proxy and closed it. Restart by refreshing device information.”

and it seemed like nothing I did would get around it. I tried everything I could think of — reboots, shutting down processes, using different COM ports…and I couldn’t find any useful references to the problem out there in Internet-land.

Anyway, I discovered what appears to be a simple and reliable (if rather inconvenient) fix entirely by chance — restart the ‘phone. All along I was assuming it was a problem with the PC end of things, but it seems like it is in fact the ‘phone that’s causing the trouble: switch it off and back on again, and it works.

*sigh* I wasted several evenings on that.

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  1. Ekief on December 6, 2005

    Good one, took me a day as well to figure it out, thanks!

  2. Aswin Anand on May 19, 2006

    Hi, is the transfer fast enough using IR?

    I also bought the DCU-11 cable. After 6 hours of hardcore battling with it, it recognised a new COM port. And im unable to install drivers on to that port. Please suggest some ideas. Thanks!

  3. Stickman on May 19, 2006

    IR transfer is slower than using the cable — which isn’t exactly speedy to begin with. However if you can’t get the cable to work then it’s better than nothing. However, if I remember correctly it was only useful for transferring files, I couldn’t use it for J2ME development via the Connection Proxy.

    As for getting the cable working — well I found it was trial and error all the way so I’m afraid I don’t have much to suggest. You could try putting it in a different USB port. And I seem to remember that there’s some way to set the COM port that it uses — either through the Settings>Control Panel>System>Hardware>Device Manager or through the DCU11’s connection software, I don’t recall.

    Good luck!

  4. Aswin Anand on May 19, 2006

    Oh! Thanks a lot dude. I will try IR too. J2ME apps can be deployed through IR right? Other than driver, what other softwares will be required?

  5. Aswin Anand on May 21, 2006

    Yippee!! I could get the cable working :D

  6. Sandro on August 17, 2006

    Maaaan, thanks a lot, I lose a couple of nights wondering what could be happenint.

    U post rules a lot.

    Thanks, thanks, thanks

  7. Sandro on August 17, 2006

    Bluetooth works too, disable the Phone connections on windows, use only bluetooth com ports.

  8. István Kerek on October 31, 2006


  9. ngakpunya on November 14, 2009

    uhh,,, could you help me connecting k300i using dcu 11 cable? i’ve tried several time, but no use. do we need some drivers or software? thanks

  10. ed on August 8, 2010

    OMG! Thank you so much! This thing was driving me crazy! It worked without problems and then stopped suddenly. I was just at the point to reinstall windows when I read your story. THANK YOU!

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