How to configure DB URL for xindice command tool ?

Hi

I have a very basic question on how to configure this command line
tool "\bin\xindice":

xindice DB is deployed under jetty server and available under the URL
http://localhost:8080/xindice-1.1/?/db

how can I configure the xindice command line to point to this URL ?

When trying
    xindice add_collection -c /db/ -n products
I get the following result:
    trying to register database
    XMLDB Exception 0: Cannot communicate with the server:
http://127.0.0.1:8888/xin
dice/

Thanks in advance
Pascal