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Make sure that cable connector is secured in the socket of the input card. Step 3. Carefully, slide the MT107-301/305/306 into slot of the Multi-Tasker™ Enclosure. Step 4. Secure each card by tightening the retainer screws at the top and bottom of each card. 7.1 RS-232 CONTROL The MT107-301/305/306 has many advanced remote control capabilities when used in the Multi-Tasker™ Enclosure as part of an MT107-100 Matrix Switcher. These capabilities are accessible through standard RS-232 communication.