can't control epick gripper

[robint-XNF]

hello，i have followed the steps try to control rpick by ROS, after i run command 'rosrun robotiq_vacuum_grippers_control RobotiqVacuumGrippersRtuNode.py /dev/ttyUSB0', the light turns to green rather than blue that showed in the vedeo, then ,i run "rosrun robotiq_vacuum_grippers_control RobotiqVacuumGrippersSimpleController.py", whatever command i use ,the epick didn't work. but i can use ur screen to control it. could anyone help me?

[robint-XNF]

add that when i echo this message 'RobotiqVacuumGrippersRobotInput', every number of arguments is '0', and never changed whatever command i send, the message 'RobotiqVacuumGrippersRobotOnput' has changed after i sent command. the outside light is blue, the USB's light is green, i think it is right, sorry.

[robint-XNF]

i find the difference from the video, i connect my epick with ur robot by I/O Coupling connector directly, and i can use the ur screen to control it. but i want to use ros to control it, so i use the micro-USB port connect the epick with my computer. i didn't change the I/O port like your video shows. can i control it by Micro-USB directly?