... in command and part number display by key 6,7, Viz. key left and right; key 1 can send the relevant command to command ... be modified, and key 2 can turn to modification mode, when key 6,7,8,9 can choose the content, key 5 can fix the content ... part number’s modification status. Key 2 can be out of modification status.Key 4 is delete key. It can work when the cursor is ...