Configuring FrSky RX6R with Radiomaster TX16S transmitter

Here's a short post on the steps needed to use a very nice FrSky RX6R receiver with a Radiomaster TX16s transmitter.

1. Ensure the transmitter is running compatible OpenTX firmware
2. Upload the appropriate FrSky firmware to the Transmitter (I used ACCST_2.1.1_FCC). This should be uploaded to the 'FIRMWARE' subtree. Firmware should be available here: FrSky downloads
3. Modify the wiring of the included SBus to servo-style connector to be yellow, black, red. This ensures correct wiring from the pins inside the Transmitter:
• 
4. Next create a new model in the transmitter (I use a dedicated one I call 'flash') which has the model set up for external RF in PPM mode. This will configures the pins in the external RF compartment to power the receiver in standalone mode:
• 
5. Now, connect the receiver to the external RF ports as shown (yellow on the 'bottom'). This will power up the receiver if wired correctly:
• 
6. Now, prepare for firmware update.  Enter 'Sys' mode, move right to the flash icon, and scroll down to select [FIRMWARE]:
• 
7. Enter this subtree and scroll down to the ACCST firmware (for US, the FCC version is required):
• 
8. Next select the firmware and see a pop-up that says "Flash External Module":
• 
9. At this point the radio lights should change to green and a progress bar of writing to flash should be displayed:
• 
10. Once the above completes, we are ready to bind the receiver. Select the receiver mode FRSKYX2 - D16
• 
11. Next prepare receiver for binding.  Here I set it up on an aircraft and power up the receiver while pressing the receiver button (actually when done correctly, the red light will be steady on):
1. 
12. And lastly, select 'bind' and set for channels 1-8:
• 
13. The receiver led flips to blue if bind is complete.  At this point, power cycle the receiver and do a fine tune and range check. Add in hardware failsafe (set transmitter to failsafe positions, power up the receiver and press the button on the receiver within 10 seconds).  You should also set failsafe in the transmitter.
14. Then you can discover the sensors and get receiver telemetry from the sensor sub-menu of the model.
15. (TODO: describe how to prepare a voltage divider so you can get battery voltage telemetry too.)