Dell Metered Rack Power Distribution Unit User's Guide download pdf (Page 29)

External Signaling Ports

Table 3 provides RJ-45 serial connector port pin assignments.

Table 3. Serial Communication RJ-45 Port Pin Assignment

Signal Name Function Direction from the rPDU

1 Unused —

2 Unused —

3 Unused —

4 RXD Receive Data In

5 TXD Transmit Data Out

6 GND Ground —

7 Unused —

8 Unused —

Ethernet Port

The rPDU provides an Ethernet (10/100 Base-T) port connection in order to use the internal NMC to monitor

and manage rPDUs.

The rPDU defaults to using DHCP when delivered. If you are unable to connect to the rPDU through the

network connection with this default address, change the IP address using the serial interface before using any of

the network interfaces. See “Serial Interface Operation” on page 50 for more information.

Once connected, you can access the graphical Web interface over the network and verify that the rPDU's

internal NMC is operational and recognized by the Web interface so the rPDU can be monitored and managed.

NOTE:

The rPDU is defaulted to use DHCP, but additional NMC configuration can be done through the serial connection

using a CLI.

To create an Ethernet connection between the rPDU and the network:

1 Locate the Ethernet cable to use for this network connection (not provided).

2 Ensure the network cable is connected to the network server or router connection.

3 Connect the Ethernet cable to the Ethernet connection port on the rPDU (see Figure 18).

Monitoring Ports

Monitoring ports are used to collect readings from connected sensors. There are two types of environmental

monitoring device (EMD) ports on the rPDU. One port is provided for a either a temperature-only or a

combined temperature and humidity sensor. A dry contact sensor port is also provided.

Temperature and Humidity Sensor (Optional)

Temperature-only or combined temperature and humidity sensors provide readings of the ambient conditions where

the sensor is installed. If a temperature or humidity reading crosses the high or low threshold setting, an alarm

displays in the LCD. (See the Settings menu on page 43.) If the sensor is not installed, or not connected to the rPDU,

the LCD displays dashes.

NOTE:

An environment alarm does not affect rPDU system operation. The alarm only reports an environmental condition.

Install and set up the sensor as instructed in the installation documentation on www.dell.com. Connect the

appropriate end of the temperature-only or combined temperature and humidity sensor cable to the

temperature/humidity sensor port on the rPDU (see Figure 18).

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Dell Metered Rack Power Distribution Unit User's Guide Page 29