When you add a 2300-XX station  via microscan, you use the dip switch settings to control the station allocation, not the serial number written on the box of the unit.

Using Add Station Wizard, use the following option:

For more information on an example setup, see Demo Setup 2300-RTD6 via Serial.

Also, note that 2300-XX stations cannot be used on the same dataloop as 2100-XX stations or Shimaden Controllers.