Accessing the Jumpers and Switches
Using a flathead screwdriver, carefully press in on the access tabs on the sides of the case until the hooks release.
Take care not to push the tabs in too far or they may break.
Once you have made your selections, close the case by aligning the top and button halves of the case, making sure that the tabs are over their mounting holes.
Setting the Jumpers and SwitchesMS8200 / MS8300 Installation Manual - Page 13