There are a couple of options. You can tell Equinox to create the console on a TCP/IP port rather than using standard input, for example:
java -jar org.eclipse.osgi_blah.jar -console 9999
... and now you can telnet into the machine on port 9999. Bear in mind however that this is very insecure, so not something you should do in a production environment.
Alternatively you can use the Felix Web Console, which will give you a full web-based management console for the OSGi framework.