Setting DMX Outputs (5-pin) to Universes other than 1 or 2

Hi,

 I may well be doing something really stupid (again) but I wanted to set my two 5-pin DMX outputs to send data for universes 11+12.

In Setup I set the Start Channels for the outputs to: 5121 (universe 11) and 5633 (universe 12). Blind Ethernet is off.

However when I hook anything up to the 5-pin outlets I find that universes 1 and 2 are being broadcasted instead of 11 and 12.

Am I missing something ?

Thanks for your help

Richard