Field descriptions for output messages

The following is an example of the AtmosVue 40 output. Refer to Campbell Scientific output message field descriptions for details about the fields.

Example message:

14 0 0 4 2192 M 1 1.66 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 0 4 HZ 24.5 33 BLM 25.7 0 0 1 5DAD

Campbell Scientific output message field descriptions

Field

 Example
value

Range

Description
Message ID 14 1 to 14 Choose 14 for the AtmosVue 40. The other options are used for stand-alone CS120A/CS125 present weather sensors.
Sensor ID 0 0 to 9 Unit number defined by the user to identify data; default is 0. Useful for RS-485 networks. Operates as an address in RS-485 mode.
System status 0 0 to 3
0. No fault
1. Possible degraded performance
2. Degraded performance
3. Maintenance required
Continuous interval 4 0 to
36000		 The amount of time, in seconds, between outputs in continuous mode.
Visibility value 2192 5 to
100000 m
 Current visibility distance being detected by the sensor.
Visibility units M M or F
M. meters
F. feet
MOR format 1 0 or 1
0. MOR
1. TMOR
EXCO 1.66   Extinction coefficient (EXCO). Refer to Present weather sensor for more information.
Averaging period1 1 1 or 10
1. One-minute average
10. Ten-minute average
System alarms 0 0 0 0 0 0
0 0 0 0 0 0

Outputs 12 error code values.
Particle count 0.00 0 to 7200;
or –99 		Number of particles per minute; –99 indicates a sensor error or the sensor has been powered less than one minute.
Intensity 0.00 0 to 999.99 mm/hr;
or –99 		Rainfall intensity (mm/hr) provides one precision value of the last minute. A value of –99 indicates a sensor error or the sensor has been powered less than one minute.
SYNOP code 4 See SYNOP and generic SYNOP code definitions.
METAR code HZ See METAR code definitions1.
Temperature 24.5 –40.0 to +80.0 ° External temperature in degrees Celsius.
Relative humidity 33 0 or 100%;
or –99 		Only outputs a valid external relative humidity (%RH) value if a AtmosVue-HV temperature and relative humidity sensor is connected. The sensor will output –99 if a AtmosVue-HV is not connected. The sensor will also output –99 if there is a fault.
BLM BLM BLM literal text.
AtmosVue-BLM luminosity 25.7 1 to 50000 Current luminance being detected by the sensor. The maximum luminance level reported by the sensor can be defined by the user via the menu system.
AtmosVue-BLM status 0 0 to 3
0. No fault
1. Possible degraded performance
2. Degraded performance
3. Maintenance required
AtmosVue-BLM day/night 0 0 or 1
0. Day
1. Night
AtmosVue-BLM units 1 1 or 2
1. cd/m2
2. fL
Checksum 5DAD Refer to Example of calculating a CCITT CRC using C program language for the checksum algorithm.

1 In accordance with WMO requirements, the sensor produces visibility measurements, that are either one-minute or ten-minute rolling averages, that are updated at the chosen output interval or when the sensor is polled. Those averages are not direct averages of MOR measurements but are averages of the extinction coefficient (EXCO), and that average is then used to calculate the MOR for that period. As the relationship between the extinction coefficient and MOR is not linear, it is possible to see quite rapid changes in MOR that might not be expected if the result was a rolling average of MOR. Take this into consideration, especially when testing the sensor with artificial obscurants or using the calibration disk.