1. If applicable, connect external contact inputs to the screw terminals on the PDU environment sensor.PDU environment sensorscrew terminalsPin 1Note: External contact device 1 is connected between pins 1 and 2. Device 2 is connected betweenpins 3 and 4 (as labeled to show device 1 and 2). External contact devices can be normally open ornormally closed.Table 4. PDU environment sensor screw terminal pin assignmentPin number DescriptionNormally open/ normallyclosed1 Contact 1 return Normally closed2 Contact 1 signal input Normally open3 Contact 2 return Normally closed4 Contact 2 signal input Normally open2. Connect the Category 5 Ethernet cable that comes with the environment sensor to the PDU environmentsensor and to the environment sensor connector on the PDU.Note: If the cable is not long enough for your configuration, you can use a cable that is 20 m (65.6 ft) orshorter.The following illustration shows how to connect an Ethernet cable to a 1U PDU and to the PDUenvironment sensor.562134LANEthernet cableEnvironmentsensor connectorPDUPDU environmentsensor3. Make sure that the PDU has a network connection, the power cord is connected, and the power to thePDU is turned on. The PDU environment sensor is automatically recognized by the PDU.4. Start a web browser and connect to the PDU IP address (for more information, see “Using the webinterface” on page 39). The web interface main status page opens. Click Environment, and then click50 1U C19 and C13 Switched and Monitored PDUs Installation and Maintenance Guide