How to tell if/which RC protocol Arducopter recognizes on SPKT/DSM port?

I cannot seem to see any channel movement with a yuneec sr24 reciever connected via the DSM port on my pixhawk 1.

is the st24 rc protocol functional?

Of all the protocols that run through the SPKT/DSM port (DSM2, DSMX, SRXL, ST24, etc) How can I tell if/which rc protocol arducopter has recognized?

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characters because i have to