Hi, all. I'd both Frysky R9 slim plus OTA with the following build with FPORT connection (Inverted)

(Master)

smartport - TX1 (FC)
VCC - 5 volt (FC)
GND - GND (FC)
SBUS IN - SBUS OUT(SLAVE)

(SLAVE)
SBUS OUT - SBUS IN(Master)
VCC - 5 volt (FC)
GND - GND (FC)

Is this correct?
Master receiver is working fined, but it won't worked (motor won't spin) when I unplug master and leave the slave to take over the control.
I'm using Jumper T18 with previously defined bind under same receiver '00' for both.
Telemetry Ch 1 to 8 (ON) = Master
Telemetry Ch 1 to 8 (OFF) = SLAVE

How to fix it, TQ.

I think you might be misunderstanding how the redundancy feature works. It's not for a situation where power to the master receiver fails. If that happens then the slave receiver will be useless.

The way the master / slave setup works is that both the master and slave receivers always needs to be powered up and connected. The slave receiver only takes over control of the RC link if communication between the master receiver and the transmitter is lost (i.e. a failsafe is detected on the master receiver), and where communication between the slave receiver and the transmitter is still present.

A master / slave setup is generally used on something like a wing where you put the master receiver with its antennas on one wing, and the slave receiver with its antennas on the other wing, so the antennas on at least one of the wings will always have line of sight to the transmitter.

(15-Mar-2021, 06:52 PM)SnowLeopardFPV Wrote: I think you might be misunderstanding how the redundancy feature works. It's not for a situation where power to the master receiver fails. If that happens then the slave receiver will be useless.

The way the master / slave setup works is that both the master and slave receivers always needs to be powered up and connected. The slave receiver only takes over control of the RC link if communication between the master receiver and the transmitter is lost (i.e. a failsafe is detected on the master receiver), and where communication between the slave receiver and the transmitter is still present.

A master / slave setup is generally used on something like a wing where you put the master receiver with its antennas on one wing, and the slave receiver with its antennas on the other wing, so the antennas on at least one of the wings will always have line of sight to the transmitter.

TQ, My slave receiver sld continued received signal and motor's still continued to spin once I unplug the Master Receiver.
In contrad, It won't spin the motor.