System power and data communication
OmniTrax Product Guide Page 61
Powering options
• power (and data) via the sensor cables
48 VDC power is connected to one or more processors, and distributed to the other
processors via the sensor cables (requires network decouplers)
(Power can be sent over the TX cables, the RX cables, or over both cables, to provide
powering redundancy.)
• local power - individual power supply at each processor
typically, a 12 VDC power supply installed at each processor location
• network power - separate power cables daisy-chained to each processor around the perimeter
(A centrally located 48 VDC network power supply provides a direct power connection to each
processor.)
Power and data via the sensor cables
With OmniTrax, both power and data communications can be carried from processor to processor
over the sensor cables. This is the preferred method for powering and data communications as it
greatly reduces the amount and cost of both power and data cable installation. In this case, a
network power supply is connected to one processor, and that processor passes the power over
the sensor cables to the other processors. The data connection between the Network Interface
Unit (NIU) and the OmniTrax system can also be made at one processor with the remaining
processors communicating over the sensor cables. However, data connections between the NIU
and two processors provides data redundancy. The power and data connections do not have to be
made at the same processor. An added benefit is that the power and data distribution is protected
from tampering by being carried by the inherently secure sensor cables.
Local power
For a single processor system, or for a system with widely distributed or remotely located
processors, individual 12 VDC power supplies are a good choice.
• local power - a standalone 12 VDC power supply is installed at each processor location (for
outdoor installation, the local power supply requires its own weatherproof enclosure)
(The optional 6 VDC local backup battery can provide approximately 2 hours of emergency
backup power.)
General system powering rules (local power)
For the local power option, each processor requires its own 12 VDC power supply. When using a
local power supply, keep the power cable run between the power supply and the processor as
short as possible.
Note The 48 VDC power supply can be used as a local power supply.
Note Follow the recommended separation distances between the sensor
cables and power cables.
CAUTION When using a 48 VDC supply to power multiple processors over the
sensor cables there is a limit of 5 OmniTrax processors per power
supply. The power supply must be connected to the central processor
with the power distributed to the remaining processors in both directions
with 2 on each side.
Note Processors, which receive 12 VDC local power must use standalone
decouplers.
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