3djc stellt es nochmal klar:
"R9M 2019 in non ACCESS mode works like module have always worked in the past. Commands (channels) are sent on one pin, telemetry is received on another channel, at a different speed using a different dialog. Telemetry for exemaple is received at 57kbps
The same R9M 2019 using ACCESS firmware does not work like that at ll. It uses a high speed dialog link, called a full duplex serial link at 450kbps, That requires a different hardware setup on the radio for that to be possible. For that reason, a X10 Express motherboard is different from your X10 radio,.
So while your radio can talk to the module in non express way at slow speed, it cannot establish a full speed link to a r9m 2019 in access mode. It would require chaning the motherboard to enable that
Hope that clarifies things"
Irgendwann kriegen es dann auch die FrSky Händler mit, bin mal gespannt