Page History

Early in the project For the wide array, from Jun 26 to Jul 18, there is some confusion about the bottom level downwind sonics sonic anemometers on towers 4, 5 and 6. The variable names from these sonics have suffixes of 4b, 5b and 6b, indicating what tower they were on.

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The samples are archived with the sensor ids, so after the data has been sampled, knowing the relation between the location and the sensor id is the most critical.critical, and is what needs to be determined for these sonics.

So far nothing has indicated any error in We generally believe that Kurt's setup notes of the relation between location and serial number are correct.

The configuration of the later arrays also confirms Kurt's notes for the wide array, since because when the sonics were moved to the medium and narrow arrays, care was taken to keep them in their respective locations.

Tom's documentation of the serial number/serial port relation for the medium spaced array 2, https://wiki.ucar.edu/x/OYWgAQ^{Image Removed}, agrees with the above serial port to serial number relation.

SteveO's entry for array4the narrow array, https://wiki.ucar.edu/x/W4CqAQ^{Image Removed}, also agrees with the above.

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Possible Cross-cabling in Wide Array

In log entry https://wiki.ucar.edu/x/tBR_AQ^{Image Removed}, Tom used rserial to record the relation between sonic serial numbers at each serial port and serial number for the wide array, and noted the following results:

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The XML specifies what sensor id is assigned by the DSM to each sample received on a serial port. It is likely that the mapping of I believe the XML was checked at that time, and it contained the intended mapping from serial port to sensor id in the XML was correct, matching the intended configuration. Assuming so, it then seems . So at that time it appeared that the actual relation between sensor id and location on the wide array was as follows:

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If the above relation of sensor id to location is was true, then our data processing, which used the intended configuration, assigned wrong location suffixes to the data from those sonics for the wide array.

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There are several counter-arguments to the above, indicating that Tom somehow confused the serial ports in his log message, and that the cabling was not crossed up matched the intended configuration in the wide array.

First, the serial number to sensor id relation can be read from the data archive, since the rserial output is archived. Assuming Tom progressed through the serial ports in order, they show the serial number sequence to be 744, 745, 376, and not 745, 376, 744. The sensor ids are also in time order, 2040, 2050, 2060:

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The serial number messages from the archive of the wide array are shown here, with their sample times:

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Assuming Tom progressed through the serial ports in order, they show the serial number sequence to be 744, 745, 376, and not 745, 376, 744. The sensor ids are also in time order: 2040, 2050, 2060, and the mapping of sensor id to serial number matches the intended configuration, and not the crossed configuration.

Perhaps two mistakes were made which cancelled each other: cross-cabling, and making the wrong complement association between serial port and sensor id in the XML? Or perhaps the XML on the DSM was corrected to match the cabling shortly after the wide array started, and then corrected back for array2the medium spaced array? Both seem unlikely. The sequence of the above serial numbers suggest that neither of the above occurred, and that the serial ports were recorded incorrectly in Tom's log message.

I (Gordon) also do not believe that the The sensor ids were have not been altered in the archive after it was recorded, since the modification times of the files have been preserved and match the original recording times.

Steve Oncley also looked at data during dust devil events from these sonics during the wide array, and the spacial continuity of the relative wind directions indicate that the sonics were in the intended configuration.

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The data is a bit noisy during the wide array, but it seems quite certain that the relation of serial number to sensor id did not change:

Serial Number vs Sensor ID History

For all sonics connected to downwind1, here is the serial number information in the archive: