Seperate Networks ?

I am working on a project that involves two physically different networks. One network is dedicated to our plant automation and the other network is our office intranet. I connected a pc to my automation server via a parallel cable and I pass information from our office intranet to my automation server (mssql) this way. It has worked quite well since not much info is transferred. Now I am trying to send information from my automation network to our office network. I can create an ODBC connection on the pc that is connected to my automation server via the parallel port and see info on my automation server but I cannot figure out, short of replicating the data, how to connect to my automation server on another pc except for the one connected via the parallel port. I created an msaccess db on our share drive and linked to my automation server and can see tables etc but only from the pc connected via the parallel cable. If I go to another pc I get an odbc driver error because I cannot create an obbc connection from any pc except the one connected by the parallel cable. I’m not a big networking person…