<cr><lf>
Response terminator
1) NMEA-format transmits only numbers as transducer ids. If the transmitter address is given as a letter, it is shown as a number
(0 ... 9, A = 10
, B = 11, a = 36, b = 37 etc.)
The checksum to be typed in the query depends on the device identifier characters and can
be asked fr
om the WXT530 Series, see example below.
Example:
Typing the command $--WIQ,XDRxxx<cr><lf> (xxx arbitrary characters) the
transmitter responds
$WITXT,01,01,08,Use chksum 2D*72<cr><lf>
indicating tha
t 2D is the correct checksum for the $--WIQ,XDR command.
If there are several distinct measurements of the same parameter (according to the
transducer table), they are assigned dierent transducer ids.
For e
xample, minimum, average and maximum wind speed are measurements of the same
parameter (wind speed) so if all three are configured to be shown in the XDR message, they
get tr
ansducer ids A, A+1 and A+2, respectively, where A is the transmitter address aXU,A.
The same applies for the wind direction. Temperature, internal temperature and heating
temperature have the same unit, thus they are assigned with transducer ids A, A+1 and A+2,
respectively. Accumulation, duration and intensity for rainfall and hails are measurements of
the same parameters so they get transducer ids A for rainfall and A+1 for hails. Rain and hail
peak intensities are assigned with transducer ids A+2 and A+3, respectively.
For example, for a transmitter with device address 0 the transducer ids of all the
measurement parameters are as follows:
Table 19 Transducer IDs of Measurement Parameters
Measurement Transducer ID Type
Wind direction min 0 A
Wind direction average 1 A
Wind direction max 2 A
Wind speed min 0 S
Wind speed average 1 S
Wind speed max 2 S
Pressure 0 P
Air temperature 0 C
Internal temperature 1 C
Relative humidity 0 H
Chapter 7 – Retrieving Data Messages
107
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www.streamlinemeasurement.co.uk
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