Control a MOXA IOLogik wia TCP
I put up a basic implementation of a ModbusTCP interface at http://pastebin.com/5twF0gUb
This is a C# class that you should mostly be able to plug into an application. I stripped it out of some other code and tried to massage it into a generic format but you may need to tweak it a bit. I glanced at the manual for that controller and it has all the addresses listed that you should need.