Data logger receives no SDI-12 data
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Reason |
Solution |
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The Measurement trigger of a connected Sommer Messtechnik sensor is set to Interval. |
Set the Measurement trigger of the sensor to SDI-12/RS-485. |
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The connected SDI-12 sensor measures continually in its own interval and does not need to be triggered. By default, the MRL-IE issues an aM! command to trigger a measurement. A continually measuring sensor requires an aR! command instead. |
Enter the command _R in S-ADD in each line of the Measurement table that refers to the respective SDI-12 sensor. |
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Multiple sensors are connected to the data logger and two or more sensors have the same SDI-12 address. |
If multiple sensors are connected to the same data logger, each sensor must be assigned a unique SDI-12 address. |
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The setting Max. measurement duration is too short. If the measurements of multiple SDI-12 sensors are triggered with the M! command, Max. measurement duration must be at least the sum of the measurement duration of these sensors. E.g., if sensor 1 has a measurement duration of 65 s and sensor 2 of 30 s, set Max. measurement duration to 100 s (95 s plus some margin). |
Check the measurement duration of each sensor and set Max. measurement duration long enough. |
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Some third-party sensors may not issue a service request when they have completed a measurement. |
If a sensor does not issue a service request after a measurement, a C! command instead of a M! command must be sent to start a measurement. Otherwise the data logger runs into a timeout or is waiting indefinitely for a service request. |
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The timing of the data logger between triggering a measurement and data request may be too tight. |
Verify that the timing between triggering and data request is sufficient. Upon a measurement request, e.g. by an M! command, the sensor returns the required measurement duration. |