WPS PIN is basically an 8-digit PIN which is encrypted with WPA and WPA 2 personal security protocols. This WPS PIN is very important to complete the connection process. Only when you provide a WPS PIN can you connect your printer to the desired device. The WPS PIN is a secure network that you can use to connect your wireless printer to your wireless router. It has been observed that many Brother printer users, when trying to set up their printer on a wireless network, are prompted for a WPS PIN to complete the setup, but they are unable to find the PIN WPS on their Brother printer. If you are also prompted to enter the WPS PIN code when you try to set up your Brother machine on a wireless network and you cannot find it, you can solve this problem by following the instructions provided below.