While it's not documented in the quick start guide, the 200 SR X has telemetry. Unfortunately, it's not normal telemetry, but used for tuning the ESC & vibration sensor. You can read
the documentation
.
In either DSMX or DSM2 mode, the F and H parameters are both 255, not showing the "888" to indicate gain adjustement, or the gain parameter number.
I created a bitbucket
issue
for this.