Full instructions for installing new processors can be found here. This applies to SIGM10, SIGM20, DTM30, DAC10, DAC20 & DSS1 boards.

A serial number is assigned by setting a point to THROWN (typically using a handheld throttle). To assign serial number=17, set point 17 THROWN.  The board responds to the first point thrown command it sees. It is important not to operate the railway with an un-configured board - because the first point operation is likely to program it.

Once the serial number has been programmed it can be changed using the "LocoAnalyse" software. Consequently setting to an erroneous value is not disastrous. However, the PC software will not be able to configure a board that has not had the serial number set initially.