SDC2160 and PPM signal

Hi all,
I have a SDC2160 motor controller.
I would know if there is a way to send commands to SDC2160 using a PPM signal (so single wire connections).
I have a FS-IA6B rx (FlySky FS-I6 tx) and I need to send to the controller 3 commands from my RC tx. The problem is that on my controller I have already connected two encoders and the RS232.

Any suggestion ?

Thanks for your support!