Figure 2-2: PoE Compatible Gateway Terminal Block
A. Case
B. Ethernet 2 (secondary)
C. Ethernet 1 (primary)
D. 24 VDC (nominal) power input
E. Serial Modbus
WARNING
When making physical connections to the Gateway it is important to use the electrical
conduit entries located on the bottom of the housing. Connecting through the open
terminal block cover (the lower cover) may stress the connections and damage the
Gateway.
Power over Ethernet
This Gateway is equipped with PoE technology to allow it to source power to a compatible
device over the connecting Ethernet cable (PSE mode) or derive its power from another
PoE device via the Ethernet connection (PD mode). This device complies with the IEEE
802.3at-2009 standard for PSE operation and IEEE 802.3af-2003 or IEEE 802.3at -2009 for
PD operation. These standards require the use of Category 5 Ethernet cable or higher.
In the operation of IEEE 802.3a, PoE power is only transmitted from one device to another
when the proper impedance match is made. This prevents damage to non PoE devices on
the network. In the Gateway, power is transmitted in passive mode over two unused
differential pairs of the Ethernet cable. To use this feature, the Gateway must be
connected over the Ethernet to a matching IEEE 802.3a device. Failure to do this will cause
no power to be sent or sourced.
A set of switches on the power supply board allow the selection of the specific Ethernet
port for PoE and the selection of whether it is a PSE (Power Sourcing Equipment) sourcing
power or a PD (Powered Device) deriving its power from another IEEE 802.9 PSE device.
See Figure 2-3 for the switch diagram required for PoE configuration.
Note
The Gateway can either source or receive power over an Ethernet port; it cannot do both
at the same time.
If using the Gateway as a PSE, the total additional power requirements of the PD must be
factored into the total input power requirements of the power supply for the Gateway. It is
Configuration Reference Manual
September 2020 00809-0200-4420
10 Emerson.com/Rosemount
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