Brother MFC-685CW - Manual (Page 85)

Wireless Configuration for Macintosh ®
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k The following list appears. If the list is blank, check if the machine is powered on, and then click Refresh.
Choose the machine you wish to configure, and click Next.
Note
The Default Node name of the NC-xxxx (where “xxxx” is your model name) is “BRWxxxxxxxxxxxx” (where
“xxxxxxxxxxxx” is your Ethernet address).