Setting fields - WXT530

WXT530 Series User Guide

Document code
M211840EN
Revision
F
Language
English (United States)
Product
WXT530
Document type
User guide
Parameter Description
[R] Parameter selection. This field consists of 16 bits defining the wind parameters included in the data messages. The bit value 0 disables and the bit value 1 enables the parameter.

Bits 1-8 determine the parameters in the data message obtained with the following commands:

  • ASCII: aR1 and ar1
  • NMEA 0183: $--WIQ,XDR*hh
  • SDI-12: aM1, aMC1, aC1, and aCC1
  • SDI-12 continuous: aR1 and aRC1
Table 1. Wind parameters bits 1-8
Bit Description
1st bit (most left) Dn Direction minimum
2nd bit Dm Direction average
3rd bit Dx Direction maximum
4th bit Sn Speed minimum
5th bit Sm Speed average
6th bit Sx Speed maximum
7th bit output mode
8th bit spare
& delimiter

Bits 9-16 determine the parameters in the data message obtained with the following commands:

  • ASCII: aR0, ar0
  • NMEA 0183: aR0, ar0
  • SD-12: aM, aMC, aC, and aCC
  • SDI-12 continuous:aR and aRC
Table 2. Wind parameters bits 9-16
Bit Description
9th bit Dn Wind direction minimum
10th bit Dm Wind direction average
11th bit Dx Wind direction maximum
12th bit Sn Speed minimum
13th bit Sm Speed average
14th bit Sx Speed maximum
15th bit spare
16th bit (most right) 0
Parameter Description
[I] Update interval: 1 ... 3600 seconds
[A]

Averaging time: 1 ... 3600 seconds

Defines the period over which the wind speed and direction averaging is calculated. Same period is also used for maximum and minimum calculation. See Appendix D Wind Measurement Averaging Method on page 201 for difference in averaging practices when A<I and A>I.

[G] Wind speed max/min calculation mode: 1 or 3 seconds G =1: Traditional max/min calculation is performed both for speed and direction. G =3: Gust & lull are calculated for wind speed, while direction calculation is as it is with G =1. In the output messages, gust & lull replace the wind speed max/min values (Sx, Sn), respectively.
[U] Speed unit: M = m/s, K = km/h, S = mph, N = knots
[D] Direction offset: -180 ... 180°, see Wind Direction Offset on page 51.
[N] NMEA wind formatter: T = XDR (transducer syntax), W = MWV (wind speed and angle) Defines whether the wind message is sent in XDR or MWV format.
[F] Sampling rate: 1, 2, or 4 Hz Defines how frequently the wind is measured. Lower sampling rate reduces the power consumption, but it also weakens the measurement representativeness.
<cr><lf> Response terminator
When using MWV wind messages in NMEA 0183, one of the [R] field bits 1-6 must be 1.
For representative wind values, use an averaging time that is long enough in relation to sampling rate (at least four samples per averaging time).