[jbester]

If these work like they used to - the connector is used to sync the lock with the key machines at the front desk. It requires a reprogram if the master keys need to change (ie someone is fired), batteries die in the lock, etc. Additionally it provides self test info and obviously if you need to force it open (i.e. Maintenance may send the open command in case of reader malfunction). That's why the mechanical solution doesn't involve physical changes to the lock guts - just the housing.

[daeken]

Not sure why this was downvoted (was in the grey a moment ago). This is dead on.