Draytek Vigor 2110 User Manual page 258

If you want to use PIN code, you have to know the PIN code specified in wireless client.
Then provide the PIN code of the wireless client you wish to connect to the vigor router.
For WPS is supported in WPA-PSK or WPA2-PSK mode, if you do not choose such mode in
Wireless LAN>>Security, you will see the following message box.
Please click OK and go back Wireless LAN>>Security to choose WPA-PSK or WPA2-PSK
mode and access WPS again.
Below shows Wireless LAN>>WPS web page.
Available settings are explained as follows:
Item
Enable WPS
WPS Status
Description
Check this box to enable WPS setting.
Display related system information for WPS. If the wireless
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Vigor2110 Series User's Guide