System and method for transmitting data via data networks with data conversion by a com automatic marshaller

摘要

The invention relates to a system and a method for transmitting data via data networks, especially via the Internet. The aim of the invention is to create a bi-directional data connection even behind firewalls, via Internet in both directions, including from a client (1) not visible as a server in the Internet. To this end, the invention provides a method or a system in which a first connection request for establishing a first transmission channel (6a, 7a, 8a) is sent to a server (4) of an automation system (5) from a first data processing device (1) of a client (1) via a data connection (6, 7, 8). This request is answered by the server (4) via a second transmission channel (6b, 7b, 8b). The data connection (6, 7, 8) is kept permanently open, hereby allowing mutually time-independent bi-directional sending and receiving of data between the client (1) and the server (4), via at least one data network, especially via the Internet. A COM automatic marshaller which incorporates itself into the communications chain between the client (1) and the server (4) is provided.