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I would like to be able to develop an iPhone application that can communicate with Modbus devices, but I'm not sure how to proceed. Has anyone had experience with this or are there existing libraries out there for this purpose?

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The big question is how you intend to physically connect to the modbus interface. If you are bridging to it via wifi or ethernet then the bridge will almost certainly have a command set specific to that bridge, and you would use that. If you have a serial bridge you want to connect directly to the iPhone you need to sign up for the Made for iPhone and sign some extra NDAs at which point Apple will give you the details necessary to interface with the USB port, then you build an adapter that has a USB-serial bridge and pump serial commands over it.

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thanks,The bridging b/w iphone and modbus is through wifi(TCP/IP) communication,.Please Let me know the existing libraries.How to proceed to develop Iphone application –  naveen Sep 8 '10 at 5:10
    
I can't tell you, how it works and whether any libraries exist completely depend on the SPECIFIC device you are using to bridge it. –  Louis Gerbarg Sep 8 '10 at 11:56

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