Ardupilot Issue ARMING_CHECK

Hello,
I just have started with this ardupilot and ran into this issue where
param show ARMING_CHECK returns nothing.

What am i missing?

This is connected to Raspberry Pi 3.

root@raspberrypi:/home/pi# mavproxy.py --master=/dev/ttyACM0 --baudrate 115200
Connect /dev/ttyACM0 source_system=255
Log Directory:
Telemetry log: mav.tlog
Waiting for heartbeat from /dev/ttyACM0
MAV> online system 1
STABILIZE> Mode STABILIZE
Y ublox

Init ArduCopter V3.2.1 (36b405fb)

Free RAM: 1999
FW Ver: 120

load_all took 13378us
APM: Calibrating barometer
APM: barometer calibration complete
APM: GROUND START
Init Gyro**
Ready to FLY ublox