I decided to add one more thing before I put the bottom hatch back in place. I made an inexpensive RS-232 to TTL Converter for adding the FrSky/Yaapu telemetry to Serial 5…which then had the protocol set to 10 for Passthrough.
The bottom wiring image and details below are compliments of RC Group member athertop (Paul). The board is an inexpensive RS-232 to TTL converter. You can buy 10 for $1.50. There is also a cheap diode needed. It’s a less expensive alternative to the $20 Craft and Theory cable. You simply solder on the connectors needed. For my FrSky X4R, the 4-pin S.Port connector comes with it.
