The FrSky S.BUS to PWM Decoder converts a S.BUS signal to a standard PWM signal as used by regular analog or digital servos. This is required where you wish to use the S.BUS receiver protocol from a S.BUS compatable receiver to drive a non-S.BUS servo.
The FrSky Servo Channel Changer is used for programming S.BUS & CCPM compatible servos. Simply connect to the servo and a battery and then use the roller switch to change and set the channel number for that servo. In addition to being compatable with S.Bus servos, it can be used to programme the FrSky S.BUS to PWM Decoder.