HOWTO:

Did you ever look for a free implementation of the serial communications protocol 3964R? I found a solution. There is a free project called "rkjava" available on the web. Please have a look at www.rkjava.de. I tried converting this Java solution to C# and – surprise – it was successful. Communication now works very well and imagine – you saved several hundred Euros.

The best feature: it's completely implemented in managed code – no P/Invoke and no ActiveX. By now I only know of the Adontec package based on ActiveX.

Tags: PLC-access via serial interface, Siemens Moby-I, VB.NET, C#, 3964 R