There was some discussion some time ago about using Labjack with Mango (someone wanted to monitor and control a remote cabin). At that time it was not possible due propriatary protocol. Labjack is now Modbus capable and has been tested ( if briefly) with Mango.
See here: http://labjack.com/support/ljsocket about halfway down the page.
This may open up a lot more possibilites for some folks.