Individual signal heads are driven from connections marked DRV1 - DRV8.
Although these are typically connections to individual signals, they can serve more than one signal as necessary.
The ID Button is used to set the individual SE8C board ID.
If using more than one such circuit board, each must be assigned a unique number so that the system recognizes it.
The Option Button is used to customize the SE8C.
LocoNet Jacks provide a data channel for the SE8C.