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I know this is strictly not an electrical engineering problem, but I think it's where it has a best chance of being answered.

I'm using a MOXA IOLogik (it's a Ethernet Micro RTU Controller) to monitor and control some security systems with digital IO and I want to modify a IOLokig internal register via TCP to send some commands to the controller from a server.

Anyone knows how to do this? how should the structure of the TCP message be?

UPDATE: It uses the modbus protocol for communication.

Thanks a lot

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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.

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