4
Technical Note
00840-1600-4420, Rev AA
Smart Wireless Gateway 1420 with Power over Ethernet (PoE)
May 2015
Smart Wireless Gateway 1420 with Power over Ethernet (PoE)
7 PoE FAQs
Does the old 1420 Gateway hardware have PoE?
No, not IEEE PoE; in the current 1420 there is a third ethernet port on the far left of the
connector board (closest to the hinge). This port has a cover on it; in the manual it is labeled
“Ethernet 2 with Power.” This connector is connected to ethernet port 2 and the spare ethernet
wires in this connector are bridged to the input power lines to the Gateway. This was designed
for special applications and is not recommended for normal use. This connector can damage
computer and other equipment connected to it if used improperly and has been removed as it is
not needed in the new PoE design.
What do I have to do to order IEEE PoE on a 1420 Gateway?
There is no specific option code for PoE. In time, all 1420s will have PoE. Initially PoE will be
offered by approvals codes as PoE is approved for that application. For example, typically N5 or
N6 approvals take the least time. These approvals codes when approved for PoE would
automatically ship with the new hardware. Approval codes like N3 or N4, which typically take a
longer time, would ship with PoE at a later date. Contact your Emerson Sales Representative to
find out if a particular code has been approved for PoE.
It should be also noted that all PoE units shipped are configured as a PoE PD on port 1. By using
the jumpers included with the unit, the installer configures the unit during installation as to
mode and port of PoE operation if desired. See the last section of this paper for jumpering
diagrams.
If I am not using PoE, how should I program the Gateway?
Program the 1420 as a PoE PD on either port; then connect up the local power supply (24 or 12
VDC) to the power input terminals of the Gateway. There is no problem if the Gateway is
programed as a PD and has local power too. The Gateway working as a PD when it sees local
power switches to the local power instead of the ethernet PoE. See the last section of this paper
for jumpering diagrams.
What type of power supply should I use with the PoE Gateway in
the PSE mode?
A Class 1 power supply is strongly recommended for all Gateway applications for improved
safety. The power supply should be a 24 or 12 VDC unit. 24 VDC allows more power to be
sourced in the PSE mode. The power supply should be able to handle at least 30 Watts if using
PSE; for good operating margin it would be advisable to consider at least a 50 Watt supply.
Note
Solar or battery power is not recommended for PoE PSE operation as there are additional power
loses caused by the PoE circuitry.
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