Which model of GlobalCache 232? There was the older GC100 then the ITach series and now the GC series. The new models appear to support HTTP and restful calls but as you want 232 I presume you want to be able to receive events.

On the older GC100, Serial port 0 was addressed via TCP/IP port 9000. Once you connected to 9000, you simply sent and received data over the socket. You did not have flexibility to configure the 232 hardware port parameters on the fly.