Yes you can use FDR with only the rotary switches configured.
The role name to use in your FDR Server (Quantum/Premium) is STBNIP2212_<numeric setting of rotary switches>. For example, if you set the switches to the value 110, enter the FDR role name in your FDR server as STBNIP2212_110. The Advantys will then assume the configured IP Address parameters and backup configuration. Note that the values are significant. When setting a device to rotary switch settings 10, use STPNIP2212_010 to use all 3 possible digits.