Futaba SBD-1 400mm 3-channel S.BUS Servo Decoder LeadFutaba SBD 1 S Bus Servo Decoder (400mm) SBD1 3003 This decoder lead is used so that a non programmable servo can also be used with the S Bus system. With the SBD lead decoding the digital signal and converting it into conventional output so that standard, non programmable servos will function correctly. This SBD lead requires programming in a similar manner to the programmable servos, either by the SBC 1 Channel Changer, or by the CIU 2 USB Adapter.