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 precipitation 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 included in the messages obtained with the following commands:

  • ASCII: aR3 and ar3
  • NMEA 0183: $--WIQ,XDR*hh
  • SDI-12: aM3, aMC3, aC3, aCC3
  • SDI-12 continuous: aR3 and ar3
Table 1. Precipitation parameters Bits 1-8
Bit Description
1st bit (most left) Rc Rain amount
2nd bit Rd Rain duration
3rd bit Ri Rain intensity
4th bit Hc Hail amount
5th bit Hd Hail duration
6th bit Hi Hail intensity
7th bit Rp Rain peak
8th bit Hp Hail peak
& Delimiter

Bits 9-16 determine the precipitation parameters included in the composite data messages obtained with the following commands:

  • ASCII:
  • NMEA 0183: aR0, ar0
  • SDI-12: aM, aMC, aC, aCC
  • SDI-12 continuous: aR and aRC
Table 2. Precipitation parameters Bits 9-16
Bit Description
9th bit Rc Rain amount
10th bit Rd Rain duration
11th bit Ri Rain intensity
12th bit Hc Hail amount
13th bit Hd Hail duration
14th bit Hi Hail intensity
15th bit Rp Rain peak
16th bit (most right) Hp Hail peak
Parameter Description
[I] Update interval: 1 … 3600 seconds. This interval is valid only if the [M] field is = T.
CAUTION The default value is 60 s. Smaller values are not recommended.
[U] Precipitation units:
M= metric (accumulated rainfall in mm, Rain duration in s, Rain intensity in mm/h)
I= imperial (the corresponding parameters in units in, s, in/h)
[S] Hail units:
M = metric (accumulated hailfall in hits/cm2, Hail event duration in s, Hail intensity in hits/cm2h)
I = imperial (the corresponding parameters in units hits/in2, s, hits/in2h), H = hits (hits, s, hits/h) Changing the unit resets the precipitation counter.
[M] Auto-send mode: R = precipitation on/off, C = tipping bucket, T = time based
R = precipitation on/off: The transmitter sends a precipitation message 10 seconds after the first recognition of precipitation. Rain duration Rd increases in 10 s steps. Precipitation has ended when Ri = 0. This mode is used for indication of the start and the end of the precipitation.
C= tipping bucket: The transmitter sends a precipitation message at each unit increment (0.1 mm/0.01 in). This simulates conventional tipping bucket method.
T= time based: Transmitter sends a precipitation message in the intervals defined in the [I] field. Do not use the auto-send mode tipping bucket in polled protocols as it decreases the resolution of the output (quantized to tipping bucket tips).
[Z] Counter reset: M = manual, A = automatic, L= limit Y = immediate
M = manual reset mode: The counter is reset with aXZRU command. See Precipitation counter reset (aXZRU).
A = automatic reset mode: The counts are reset after each precipitation message whether in automatic mode or when polled.
L = overflow reset mode. The rain counter or hail counter is reset, when it reaches the predefined limit. The overflow limits (x, y) are defined with the commands aRU,X=x for rain counter and aRU,Y=y for hail counter.
Y = immediate reset: The counts are reset immediately after receiving the command.
[X]

Rain accumulation limit : 100...65535. Sets the rain accumulation counter resetting limit. When the value exceeds the limit, the counter is reset to zero. If the precipitation unit aRU,U=x is metric, the limit corresponds the range between 1.00 … 655.35 mm. If the precipitation unit is imperial, the equivalent range varies between 0.100 … 65.535 in.

To enable this feature, set the counter reset to aRU,Z=L (overflow reset mode).

[Y] Hail accumulation limit: 100 … 65535. Sets the hail accumulation counter resetting limit. When the value exceeds the limit, the counter is reset to zero. If the hail unit aRU,S=x is metric, the limit corresponds the range between 10.0 … 6553.5 hits/ cm2. If the unit is imperial, the equivalent range varies between 100 … 65535 hits/in2. If the unit is hits, the limit matches directly to the amount of hits: 100 … 65535 hits.

To enable this feature, set the counter reset to aRU,Z=L (overflow reset mode).

<cr><lf> Response terminator
The auto-send mode parameter is significant only in ASCII automatic (+CRC) and NMEA 0183 automatic protocols.
Changing the counter reset mode or precipitation/surface hits units also resets precipitation counter and intensity parameters.

The field [Z] defines how the counters are reset. Use "L" to enable the rain overflow reset mode. Now the rain accumulation limit feature (X and Y) becomes particularly useful for systems using an analog interface adapter. Thus, the dataloggers have no serial interface that would enable them to reset the rain counters.