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Use
Fitting the module
This is quite straightforward.
1.
Fit a spacer at each of the mounting holes on the Raspberry Pi.
2.
Fit the adaptor onto the GPIO port and then use the other screws to fix the adaptor to the spacers.
Depending on your application, it may be necessary to omit the two screws either side of the GPIO
port.
3.
Connect the cable link between the Pi’s network port and the output of the PoE adaptor
4.
Connect your PoE enabled network port to the input of the PoE adaptor
At this point, if there is PoE power on your network port, the Raspberry Pi will turn on.
Power Supply
The module is capable of supplying 2.5 amps of current at 5 volts in addition to the current needed to power
the Pi itself. However, to make full, continuous use of this capacity additional cooling of the module will be
required. With no additional cooling the additional continuous current capacity will be about 1 amp.
Backup Power
If a power-fail backup supply is required this should be DC, and between 12 and 48 volts.
The backup supply is connected to the terminal block on the top right corner of the adaptor with the positive
lead connected to the terminal marked "+". Reversing the polarity will not harm the adaptor as there is reverse
polarity protection. With a voltage applied, the red "Backup Present" indicator will illuminate.
Indicators
There are five LED indicators on this module. Looking at the module with the GPIO port at the top and reading
left to right they are as follows:
Green, "3.3v":
indicates 3.3 volt supply from the Pi is present. This powers the RTCC.
Green, "5v":
indicates the 5 volt supply is present on the PoE module.
Red, "Backup Present": indicates that a voltage is present on the screw terminals.
Red, "PoE Present":
indicates that a Power over Ethernet supply is OK.
Red, "PoE Type 2":
indicates that a high power Type 2 or IEEE 802.3at supply is present.
If the PoE supply fails and the backup supply takes over, the PoE LEDs will extinguish but the "Backup Present"
and green voltage LED's will continue to glow, thus indicating that there is still power connected but that it’s
not coming from the network.
The Real Time Clock and Calendar
The RTCC is battery backed with a coin cell type BR1225 or equivalent, which is installed with the positive (+)
side facing away from the board (see below for an illustration of the correct orientation) and pushed fully in.
Whilst this is not essential for the operation of the RTCC, if it is not fitted and the adaptor loses all power the
RTCC will need to be reset to the correct time when power is restored.
