I'm looking for a OPC server for MarkV using PCI ARCNET CARD, to replace <I> station.
Matrikon has an OPC server using <I> as a gateway using GSM protocol, but my problem is old DOS PCs.

 

MatrikonOPC also has an OPC Server for MarkV that speaks directly to the controller via ARCNET over the Stagelink protocol. This should suit your needs perfectly.

http://matrikonopc.com/opc-drivers/2314/index.aspx