Hi Rated X.
Thank you for your reply. I was not able to solve my problem so I had to stay at iso-on-tcp communication. We had no time to study and establish TCP communication in our case, we had to finish our work. So we used existing and functional solution in this particular case - iso-on-tcp. In another cases I of course try to use TCP connections..
By the way, if you want to communicate with Matlab by TCP (I think that maybe there was some questions about this here on forum), it can easily done nowadays. Matlab always had TCPIP object for communication. But now, from version 2011b, you can set client or server property to this object so communication establishment is easier now...