... Monitor lift has 5 buttons, which are used for manual control (from left to right): Horizontal rotation; Vertical rotation, Pause, ... up, Lift-down.2. Remote control3. RS232, RS485 controlYou can control the LCD monitor lifts working as individual, group or whole ... hole size(mm)420×81N.W22kgControl modesmanual,remote,RS232 RS485 control Audio visual system RS232 RS485 control 19 inch LCD monitor lift