7RTR-5W Part Names and Functions■ Part NamesFRONTOptical Communication AreaPOWERAlarmMonitorPOWER LED While the power is ON, the lamp will be on.Alarm LED When a warning occurs, the lamp will blink.Monitor LED While wireless communication is occurring with a Remote Unit,the lamp will blink.Optical CommunicationAreaWhen you wish to communicate directly, not by wireless, with adata logger (Remote Unit), it is necessary to place the logger(Remote Unit) face down on this area for communication to occur.BottomExternal Output TerminalExternal OutputTerminalConnect to an alarm buzzer or light to notify locally of the occurrenceof a warning.(Conditions for Output to be switched ON)It switches to ON when a warning is received from at least one RemoteUnit.