PDietz, it is possible to initiate communications from the H0-ECOM side using "report-by-exception" (RBE) methodology. However, it is not going to use TCP/IP but rather UDP. You can read about it by going to our website (www.hosteng.com
), clicking on ECOM underneath Hardware in the left pane. The 4th bullet on that page talks about RBE and links you to a file you can download. This is quite dated, but it can be done.