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Troubleshooting Troubleshooting 6/18/2019
Products: RP-C, SmartX Sensor
Functionalities: Hardware
Product version: 3.0

SmartX Sensor or RP-C Controller Sensor Bus Is Not Operational

The SmartX Sensor or the RP-C controller sensor bus is not operational. The Sensor Bus LEDs on the RP-C controller may indicate that there is no data communication on the sensor bus. For more information, see RP-C LEDs .

Notice

EQUIPMENT DAMAGE

Do not connect an Ethernet cable from the controller's Sensor Bus port directly to an external Ethernet switch or router.

Failure to follow these instructions can result in equipment damage.

Solution

The solutions are listed in order: the solution most likely to fix the problem is listed first. Work through each solution until the problem is resolved.

  • Ensure that the sensor bus cable is connected to the port labeled Sensor Bus on the RP-C controller and that the cable is properly connected to the RJ45 receptacle on the printed circuit board of the SmartX Sensor.

    For more information, see Connecting SmartX Sensors to an RP-C Controller .

    For more information, see SmartX Living Space Sensor Base Installation Instructions .

    For more information, see SmartX Living Space LCD Temperature Sensor Installation Instructions .

  • When two to four SmartX Sensors are connected in a daisy-chain configuration, ensure that each cable that connects two sensors is properly connected to the RJ45 receptacles on the printed circuit boards of the sensors.

    For more information, see Connecting SmartX Sensors to an RP-C Controller .

    For more information, see SmartX Living Space Sensor Base Installation Instructions .

    For more information, see SmartX Living Space LCD Temperature Sensor Installation Instructions .

  • Ensure that the sensor bus cable is wired correctly.

    Check the color coded wires in the Cat 5 (or higher) cable to verify that the cable is properly straigth-through wired.

  • Ensure that the number of SmartX Sensors connected to the RP-C controller does not exceed the maximum limit, which is varaible depending on the selected SmartX Sensor model and the combination of cover and sensor base type.

    For more information, see RP-C Specification Sheet .

  • Ensure that the total length of the sensor bus does not exceed 61 m (200 ft).

  • Connect a known working SmartX Sensor alone to the RP-C controller sensor bus port to determine whether the problem is due to the controller, sensor, or wiring.

  • Ensure that the SmartX Sensors do not consume too much power, causing a voltage drop on the sensor bus.

    Use a digital voltmeter to check that the voltage on the sensor bus (measured at the controller) is not below 20.4 VDC. A standard RJ45 breakout terminal block can be used to facilitate the measurement.

    Measure the voltage on the following RJ45 connector pins:

    • Pins 4 and 7: 24 VDC (>20.4 VDC)

    • Pins 5 and 8: 0 V (Ground)

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