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Tech note: Instructions for updating ATMOS 41 firmware

Tech note: Instructions for updating ATMOS 41 firmware

These instructions are for the ATMOS 41 weather sensor suite, updating to firmware versions > 5.00.

A new wind speed algorithm was implemented, which requires a re-zeroing of the wind speed. First, update the firmware (FW), and then re-zero the instrument. Detailed instructions are shown below. To perform the following actions, you will need access to a ProCheck, terminal application (e.g., TeraTerm), cable adapter, wind shield (such as paper, cardboard, and fleece blanket), and computer with a Windows platform.

  • Update the ATMOS 41 firmware. Instructions here.
  • The following steps are for re-zeroing the wind speed. After updating the ATMOS 41 firmware, close the updater utility but keep your ATMOS 41 connected to the ProCheck and computer.
  • NOTE: Firmware version 5.00 does not require re-zeroing the wind speed.

Instructions for ProCheck: 

  1. Open TeraTerm (or other terminal application).
  2. Connect to the ProCheck by selecting Serial and then “METER USB Adapter” in the dropdown menu. Select OK.

In Setup, select Terminal…

  • Under “New-line” “Receive”, select CR+LF.
  • Put a checkmark next to “Local echo”.
  • Press OK.

3. Type [ to enter the direct communication mode on the ProCheck. After entering direct communication mode, if your sensor is address 0 the DDI string will look like a random string of characters (e.g.{VEy>ek). Type ?I! to view sensor information.

4. Type ?Xa!0 -0.099 -0.132 0.044 0.079 11.5 12.0 11.0 10.9

The command is shown in blue text, and the output example is shown in red text. If any of the last 4 values are 0, then perform step 5, otherwise skip to step 6.

5. Type ?Xb 0.0 0.0 0.0 0.0 10.0 10.0 10.0 10.0!0OK

-Make sure the sensor returns OK. If there is an error, repeat this step.

The next steps need to be done with the sonic anemometer sensor covered so that there is no air movement! In the field, you will need something better than paper or cardboard when re-zeroing the wind speed. We have found it effective to use paper or cardboard first, then cover the sensor suite in a fleece blanket. This ensures no sound will enter the sensor during the re-zeroing step.

Figure 1. First, use paper or cardboard
Figure 2. Second, cover the sensor suite in a fleece blanket

 

6. With the sonic anemometer covered, type ?X1!0OK

-This will set the phase to zero. Make sure the sensor returns OK. If there is an error, repeat this step.

-Type ?X6!0 0.000 -0.000 -0.000 0.000 360 361 360 360 0.00 -0.00 0.00 500

The command is shown in blue text, and the output example is shown in red text. This command returns the SDI-12 sensor address, four phase values, four values that you don’t need to worry about, two wind velocity components, wind speed, and lightning sensor frequency respectively. The phase values should be 0.000 +/- 0.002 when they are set. The wind velocity and wind speed values should be 0.00 +/- 0.02. The final number is the lightning sensor frequency which can be ignored. Repeat step 6 if the values are outside of the tolerance (see the example below).

7. Exit the terminal program.

8. Remove the wind shield.

9. Reconnect the sensor suite to the data acquisition setup.

10. Ensure that the engraved N is pointing toward True North.

11. Re-level ATMOS 41, ±2 degrees from (0,0).

 

A METER data logger (EM60 or ZL6) can be used to re-zero wind speed after the firmware is updated.

Instructions for METER data logger:

  1. Open ZENTRA Utility, and connect to the data logger.
  2. Under Actions, select Digital Sensor Terminal.
  3. Select the correct sensor port, and send the ?I! Command.
    • You should see 013METER  ATM41 XXXATM-41000XXXX output returned when the SDI-12 address is 0.
  4. Type ?Xa!
    • If any of the last four values are 0, then perform step 5, otherwise skip to step 6.
  5. Type ?Xb 0.0 0.0 0.0 0.0 10.0 10.0 10.0 10.0!
    • Make sure the sensor returns OK. If there is an error, repeat this step.

The next steps need to be done with the sonic anemometer sensor covered so that there is no air movement! In the field, you will need something better than paper or cardboard when re-zeroing the wind speed. We have found it effective to use paper or cardboard first, then cover the sensor suite in a fleece blanket. This ensures no sound will enter the sensor during the re-zeroing step.

Figure 1. First, use paper or cardboard

 

Figure 2. Second, cover the sensor suite in a fleece blanket

 

6. With the sonic anemometer covered, type ?X1!

  • This will set the phase to zero. Make sure the sensor returns OK. If there is an error, repeat this step.
  • Type ?X6!

This command returns the SDI-12 sensor address, four phase values, four values that you don’t need to worry about, two wind velocity components, wind speed, and lightning sensor frequency respectively. The phase values should be 0.000 +/- 0.002 when they are set. The wind velocity and wind speed values should be 0.00 +/- 0.02. The final number is the lightning sensor frequency which can be ignored. Repeat step 6 if the values are outside of the tolerance (see the example below).

7. Exit the terminal program.

8. Remove the wind shield.

9. Reconnect the sensor suite to the data acquisition setup.

10. Ensure that the engraved N is pointing toward True North.

11. Re-level ATMOS 41, ±2 degrees from (0,0).

 

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