This Driver can communicate with any FINS-compatible device through a Host Link port. That device can then process a given FINS command if it is the destination node, or relay the message to another device if it is not.

According to the FINS network diagram figure on topic FINS Purpose, it is advisable to send a data request from the server computer to PLC4. The Driver builds a FINS data request message with the appropriate source and destination parameters in its header, encapsulates that message in a Host Link package, and sends it to PLC1. PLC1 then examines the FINS message header and determines that node 2 (two) or network 2 (two), that is PLC4, is the intended destination.

When referring to its routing tables, discussed shortly, PLC1 determines that the message must be sent to the gateway device, PLC2, to reach the destination node on network 2 (two). As PLC2 is not on a Host Link network, the Host Link package is removed. PLC2, by its turn, sends the message to PLC4. PLC4 then sends its response back to the server computer via PLCs 1 (one) and 2 (two). PLC1 wraps the FINS response in a Host Link package, which this Driver can recognize and process. Similar device objects could be created for PLCs 1 (one), 2 (two), 3 (three), and 5 (five).