Pre-Installation Considerations: RTMS Echo Sensor

Cabling : Customer Provided Cable

If the ISS provided cable is not to be used a customer-provided cable can be used. The cable must be a CAT5e or better, must be outdoor rated, and must have a drain wire (avoid cables without drain wires). The recommended connector used to plug into the Echo sensor is CONEC Industrial Ethernet Circular Sealed RJ-45 Connector, part number 17-101794. The length of the cable is dependent on the power supply. If the power supply is 12VDC the cable should not exceed 50 ft (15.24 m) in length. Longer cables can be used when the power supply is 24VDC. The outer diameter of the cable must be compatible with the preferred CONEC connector, which is supplied as a kit, and comes with a shielded RJ-45 plug shell. This shell can accept cable diameters ranging from 0.2 inches (5.08 mm) to 0.26 inches (6.73 mm). Hard cable jackets, like the ones used for outdoor cables, are restricted to the lower end of this range. When choosing a cable, be aware that cable manufacturers often specify a nominal overall cable diameter, rather than a drain wire. The foil, by itself, may not provide enough protection during voltage surge events. The best methods for shielding are listed, below, in order of effectiveness:
  • Copper braid with, or without, drain wire
  • Foil shield with drain wire
  • Foil shield with no drain wire (avoid, if possible)
Make sure that the cable shield is securely connected to the metal shell of the RJ-45. Shieldingof the twisted pairs within the cable is not required; only an overall cable shield is required. For information on installing the CONEC connector on the cable, see the IP67 RJ-45 assembly instructions at: IP67 RJ-45 assembly instructions download NOTE: The instructions indicate that the cable fitting should be torqued up to 20 inch-lbs. This amount of torque may cause the rubber cable gland to be over-compressed and bulge out the back side of the cable fitting. Use an amount of torque that allows for a snug fit between the cable and the cable gland, without causing the rubber to bulge.
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