Xlinks is available when you enable a specific Xlink to your application and have purchased the Xlinks unlock.
Select / Features / Implement and set Xlinks to Enabled the Xlink that you require.
Purchasing Xlinks Interface
Locate your Console Identifier and request a registration code from your authorized Topcon dealer. Your dealer will then get you the registrations keys from Topcon and supply you with a registration code. All Xlinks to third party controllers may then be enabled for use without reentering the registration code.