4.  OPERATION
The Apex gas measuring system is controlled from the Transmitter Unit via a menu system, 
displayed on an LCD screen, and a set of control buttons. 
Thischapterprovidesoperationalinformationaboutthefollowing:
  •  Display and control buttons
  •  Start-up
  •  Passwords
  •  Menus
  •  User Tasks
  •  Fault diagnosis 
  •  System Calibration
  •  Binding the Communications Board to the Network
IfanoptionaldigitalcommunicationsboardisttedintheTransmitterUnit,e.g.LonWorks,then
control can also be achieved from a remote location.
4.1  DISPLAY AND CONTROL BUTTONS
LCD screen
Control