Trouble in connecting raspi and APM

Hi,currently,I am using mavproxy which runs on raspi to control my quadcopter, I set up the environment for raspi and connect it to  the APM yesterday ,every things seems ok,i can see a lot of data of APM on rasbian and APM response well to the commands i typed in ,so i tried to controll the drone by raspi,but unfortunetly,when i type" rc 1 1000",there is no response,why?

QQ图片20150606135243.jpg

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