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 your printer icon and click [Printer properties] or [Properties].
In the [Ports] tab, make sure that the [Enable bidirectional support] check box is
Configuring Printer Ports(P. 168)
Displaying the Printer Folder(P. 474)