On this page:
http://planner.ardupilot.com/wiki/commonmission-planner-command-line-interface-cli/
There are references made to a slide switch e.g. “Remember to always have the APM slider switch in CLI position (towards the RC pins) when you’re using the Terminal!”
I cannot find such a switch on the APM 2.5/6 or Pixhawk images. To what does this refer?