RC seems not work well, what's wrong?

I connected Futaba RC(R2008SB), Dji's ESC and motors to your Zynq Mini Box based on guideline - https://aerotenna.readme.io/v1.0/docs/integrating-the-ocpoc-mini-zynq-into-a-pre-existing-airframe and then try to run px4 based on guideline - https://aerotenna.readme.io/v1.0/docs/px4-setup. It seems the system didn't work, I monitored PWM signal and found that no any change when I tried to control motor by RC radio. The RC radio and Dji's ESC/motors all worked well on my current Pixhawk platform. For Pixhawk platform, there is safty switch for arm and disarm (I didn't find it on Zynq Mini Box). Do I miss anything for Zynq Mini Box? Any comments?