Cabling Considerations - Image Sensing Systems RTMS Echo User Manual

Chapter 2:

Cabling Considerations

RTMS Echo User Guide
On power up, there will be an inrush current that will be several times higher
than the operating current. The power supply must be able to handle this
temporary current flow. If the power supply is unregulated (such as a simple
step-down supply from 120 VAC to 24 volts DC), the output voltage may be
higher than specified when the current draw is less than maximum available
from the supply. This may cause the RTMS Echo to sense an overvoltage
condition and shut down to protect itself.
The RTMS Echo uses an outdoor rated CAT5e or CAT6 cable that provides
both power and Ethernet communications. The recommended cable has the
following features:
•
CAT 5e rating
•
Polyethylene jacket for moisture, water and UV protection
•
Foil shield to protect from EMI/RFI interference
•
23AWG solid connectors fit for PoE applications
•
Ground wire
The cable provided by ISS is 50 ft (15.24 m) in length and comes with an 8-pin
RJ-45 connector on the end that connects into the RTMS Echo. The connector
also contains an element to which the ground wire is attached. The other end
of the cable is what needs to be connected to power, communications and
ground in the breakout box. Cable pinout is a combination of standard
Ethernet and custom. The green and orange pair are wired like standard
Ethernet for 100Mbits per second data transfer. The wiring and pinouts for the
connector are shown in the Figure below.
VIN-
VIN-
Rx-
VIN+
VIN+
Rx+
Tx-
Tx+
Figure 2-1: RJ-45 Connector Pinouts
The non-colored wire in the cable must be connected to Earth ground in the
breakout box if the cable is not terminated with an RJ-45 connector. If it is
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RJ-45
Brown
White/Brown
Green
White/Blue
Blue
White/Green
Orange
White/Orange
Pre-Installation Considerations
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