WS425 F/G ASOS data message - WMT700

WMT700 Series User Guide
Document code
M211095EN
Revision
K
Language
English
Product
WMT700
Document type
User guide

WMT700 responds to the WA command with a data message.

  • The sensor status (byte 4) indicates the following:
    • P (Pass) indicates that all diagnostic tests have passed and WMT700 is functioning normally.
    • F (Fail) indicates that one or more of the diagnostic tests have failed. You can then request diagnostics and extended tests (WS) to further isolate the problem.
    • H (Heater failure) indicates that the wind reading is valid but one or more built-in heater diagnostic tests have failed.
  • When the status byte is F, the wind direction fields are set to 999 and the wind speed fields are set to 999.9 in the applicable sensor response messages.
  • The signal quality (bytes 26-27) is a numeric value from 0 to 99 representing the data quality of processed data samples during the averaging time.

    For example, a value of 99 signifies that all data samples were determined to be valid and processed during the averaging time. If some samples were determined to be "missing", these samples were not processed and the reported signal quality is a proportional value less than 99.

  • Bytes 28-29 are the modulo 256 hexadecimal checksum of the ASCII values calculated for bytes from 2 to 27.
Table 1. WS425 F/G ASOS data message
Byte Description
1 Start of text
2 Sensor ID
3 Command identifier
4 Sensor status: 1 2
  • P = Pass
  • F = Fail
  • H = Heater failure
5-7 Averaged wind direction (degrees)
8-10 Wind direction (degrees) @ peak wind speed
11-12 Averaging time for wind speed and direction
13-14 Averaging time for peak wind speed and direction (seconds)
15-19 Averaged wind speed
20-24 Peak wind speed since last WA command
25 Wind speed unit:
  • M = Miles per hour
  • K = Knots
  • L = Kilometers per hour
  • T = Meters per second
26-27 Signal quality 3
28-29 Hex checksum 4
30 End of text
31 Carriage return
32 Line feed

Example

WAP2131870503012.6014.7K99xx

Interpretation of the example message:
  • Sensor ID: W
  • Command identifier: A
  • Sensor status: P = pass
  • Averaged wind direction (degrees): 213
  • Wind direction (degrees) @ peak wind speed: 187
  • Averaging time for wind speed and direction: 05
  • Averaging time for peak wind speed and direction (seconds): 03
  • Averaged wind speed: 012.6
  • Peak wind speed since last WA command: 014.7
  • Wind speed units: K = knots
  • Signal quality: 99
  • Hex checksum (refer to note 4): xx
1

The sensor status (byte 4) indicates the following:

  • P (Pass) indicates that all diagnostic tests have passed and WMT700 is functioning normally.
  • F (Fail) indicates that one or more of the diagnostic tests have failed. You can then request diagnostics and extended tests (WS) to further isolate the problem.
  • H (Heater failure) indicates that the wind reading is valid but one or more built-in heater diagnostic tests have failed.
2 When the status byte is F, the wind direction fields are set to 999 and the wind speed fields are set to 999.9 in the applicable sensor response message.
3 The signal quality (bytes 26-27) is a numeric value from 0 to 99 representing the data quality of processed data samples during the averaging time. For example, a value of 99 signifies that all data samples were determined to be valid and processed during the averaging time. If some samples were determined to be "missing", these samples were not processed and the reported signal quality is a proportional value less than 99.
4 Bytes 28-29 are the modulo 256 hexadecimal checksum of the ASCII values calculated for bytes from 2 to 27.