22
Reference Manual
00809-0200-4420, Rev HC
Section 3: Installation
July 2015
Installation
Figure 3-10. Typical Half Duplex (2-wire) Network
3.4.5 Power
The Gateway is designed to be powered by 24 VDC (nominal) and requires 250 mA of current.
The positive and negative connections are found on the left side of the terminal block
(Figure 3-6). An additional case ground is found on the left side of the junction box enclosure.
Connect supply power to the positive + and negative – power terminals found on the left side of
the terminal block (Figure 3-6). Recommended torque is 7 in-lbs and the gauge is 12 to 22 AWG.
An additional internal case ground can be found on the left side of the enclosure. The wiring
should include an external power shut-off switch or circuit breaker that is located near the
Gateway.
Note
Using an uninterruptible power supply (UPS) is recommended to ensure availability should there
be a loss of power.
Note
When using PoE PD, a power supply is not required.
3.4.6 Power over Ethernet (PoE)
The new Gateway hardware supports IEEE 802.3af and IEEE 802.3at PoE.
With the growth of ethernet, many have wanted to save time and cost on wiring by sending
power down to an ethernet device over the same ethernet cable used to haul data. This is
possible because there are four extra wires in an ethernet cable that are typically not used. In the
past there was no formal standard, people came up with their own wiring schemes for using
these wires to provide power. This resulted in a number of different schemes to exist and lead to
confusion as people were damaging their computers because they did not know there was
power available over the ethernet cable.
Up to 4000 ft. (1220 m)
Device 1
A
B
Terminators required
only for high data
rates and long cable
runs
Device N
(up to 32
possible)
Device 2
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