Deditec USB-BITP-200 Hardware Dokumentation Seite 188

To protect the module against unauthorized access, authentication
must be performed when editing system settings.
Depending on the product type, you will be prompted to press the
firmware reset button of the module for a certain time (RO-ETH and
RO-CPU-800) or change DIP switch settings (all other products, eg
RO-ETH / LC) , NET-ETH, ETH-RELAIS-8, etc...
The following example shows how authentication is performed on
an RO-ETH / LC module.
Software | Seite 188