The initial task in setting up the communications parameters involves specifying whether Ethernet or serial communications will be used. If you choose Ethernet, you will be prompted to set the Ethernet address and port. The default port is 9100. It should not need changed unless port 9100 is not allowed on your network. If a new port will be specified, make sure that it matches the port setting of the matrix controller. The default port value of the matrix controller is also 9100.