Kevin,
Apologies only just seen this post.
I use the 111 version of these boxes (232 single port) for controlling panasonic PT-D series projectors.

They can be a bit temperamental in their boot order. Quite often if they will give the appearance of being connected and working -lights on and flashing, but will not pass commands and no access from a web browser.

I've found that reseting them in the following way seems to remedy this;

  1. Disconnect power and network cables from the unit
  2. reinstate power only
  3. the red power light will come on then drop out, after a few seconds the orange data light will flash
  4. reconnect the network cable


Try that if you encounter the problem again.

Paul