Transmit less than 8 channels using the internal FrSky?

[algo]

I'm using a D4R-II RX in CPPM mode which has a short 18ms frame time and can not handle 8 channels (yes I know about the 27ms firmware, I don't want that).

With my DJT TX module all I do is set the TX to 6 channels and the D4R-II outputs only 6 channels. With the Taranis however (in D8 mode), even if I set to use only CH1-6 I still get 8 channels output on the D4R-II. This causes glitching problems because it's too many channels for the CPPM output.

Is there some way to make the Taranis output only 6 channels?

[Kilrah]

No, the PXX protocol used between the radio and module only works with 8-channel packets.

Sent via mobile

[algo]

Hmm, that seems like a major problem when using their own RX!

I can set CH7-8 to MAX -100 but the frame is crowded and MultiWii still glitches sometimes. The DJT in 6 channel mode works much better.

[algo]

I wonder if there is any chance FrSky could create a firmware for the D4R-II that outputs S.Bus instead of CPPM. I believe that would eliminate the problem.

[Kilrah]

The 27ms firmware already eliminates it, but for some reason you don't want it

[algo]

Because the latency is very high. Delayed controls is annoying when trying to do precision acrobatics.

S.Bus would give me 9ms but even 18ms is better than 27!

[Kilrah]

Not sure. We don't really know how the XJT operates in D8 mode.