Canon EOS-1 DX Mark III Advanced User's Manual page 571

Connecting via WPS (PIN Mode)
Instructions in this section are continued from
This is a connection method used with access points compatible with WPS. In PIN code
connection mode (PIN mode), an 8-digit identification number indicated on the camera is
entered on the access point to establish a connection.
Even if multiple access points are active nearby, connecting by using this shared
identification number is relatively reliable.
It may take approx. 1 min. to establish a connection.
1.
Select [Connect with WPS].
2.
Select [WPS (PIN mode)].
Select [OK].
Checking the Type of Access
571
Point.