Onkyo TX-NR545 Manual page 181

Troubleshooting
Operating other Onkyo component by using a RI remote control code is
not available
Make sure that the Onkyo component is properly connected with RI
cable. When RI cable is used for connection, make sure to connect
analog audio cable as well. (Connecting only an RI cable will not be
enough.)
Make sure you have selected the correct remote controller mode.
When the RI remote control code is input, point the remote controller at
remote control sensor of the unit.
Make sure that the input display is correctly set.
Input the RI remote control code again.