... can be moved to command and part number display by key 8,9, Viz. key up and down; then choose the command ... part number in command and part number display by key 6,7, Viz. key left and right; key 1 can send the ... . In this mode, key 8,9 can choose the content that needs to be modified, and key 2 can turn to ... modification mode, when key 6,7,8,9 can choose ...