Rx Output

Receiver Output Format

It is possible to configure the output format of the channel data from the receiver to servos (or to a flight controller board). Go to the System ⭢ Rx Setup ⭢ PPM Output menu:

There are four combinations available:

• PPM + IBUS
• PWM + IBUS
• PPM + SBUS
• PWM + SBUS

PPM or PWM

Options containing PWM mean that each of the channels is sent over a separate pin. For example, for FlySky FS-iA6B, the connectors Ch1 to Ch6 can be used. For FS-iA10B, the first 10 channels have their own PWM output connector.

Options containing PPM mean that the first six or eight channels are sent together as the PPM signal over the single connector labeled PPM/Ch1.

IBUS or SBUS

Independent of the above, IBUS or SBUS can be chosen. These variants control which protocol is sent from the digital output port of the receiver (e.g. the one labeled I-Bus/Servo on FlySky FS-i6). All 14 channels are sent over the digital output port.

I-Bus is the native FlySky protocol, comunicating over 115200n8 TTL serial connection.

S-Bus is the protocol developed by Futaba which uses inverted TTL serial signal at 100000 bauds.

Note that there is also a firmware modification for FS-iA6B by @qba667, which can send both the telemetry and the servo data in the I-Bus protocol over the I-Bus/Sens port.