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If anyone is interested my code is at http://www.dons.net.au/%7Edarius/hgwebdir.cgi/iec1107/

No one reads this but I'll just try it once more ;) I've bought the Volkszaehler usb head and installed it's driver on my laptop with XP. With the iec1107 test programm I can let my Ampy 5227 respond, just like with the above pcb. This program doesn't see the data the Ampy sends out with it's red l...

At the beginning of this thread there's some sample code in C# and VB.Net. If that doesn't help you out, I can have a look at your Python code if you like? I realised what my problem was - I was reading fixed sizes instead of using readline. This meant the timing was off and the meter would reject ...

Thanks very much for this post it is very informative and a lot cheaper than buying from IEC ;) I have been writing some code in Python (so I can read it on OSX & Linux) and I can elicit a response but it is not reliable. I think it must come down to some timing issue as the test1107.exe program...