Why are there no configuration options in CLI for PowerConnect 2816?

I've just purchased a Dell PowerConnect 2816 and I'm connected using the serial cable (which is working fine). However, there appears to be no configuration options.

For example, under "interface ethernet g1", I type "?" and this is the what I see:

end Exit from configure mode
exit Exit from current context
help Description of the interactive help system console
(config-if)#

Shouldn't I have some actual configuration options?

Here's exactly what I'm doing to enter configuration mode:

enable
configure
interface ethernet g1

Thanks for any help...