In the [Ports] tab, check that the port is selected correctly.
If you are using a network connection and have changed the machine's IP address
If [Description] for the selected port is [Canon MFNP Port], and the machine and the computer are on the
same subnet, then the connection will be maintained. You do not need to add a new port. If it is [Standard
TCP/IP Port], you need to add a new port.
Checking Bidirectional Communication
Open the printer folder.
Right-click the printer driver icon for this machine, and click [Printer properties] or
Configuring Printer Ports(P. 49)
Displaying the Printer Folder(P. 333)