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Texas Weather Instruments, Inc. 15 WRL Instruction Manual
date time temp humidity bp rain wind speed direction
Note: if you have the optional solar sensor, all aux temperature data will be replaced
with solar data followed by the letter K.
Reference
Control Options
Control options can be changed via the console using the print set routine (see print set
mode). These control options can also be changed using TWICAL software, which is
available on www.txwx.com. The first control option is daylight savings mode. When
enabled this option will make the weather station automatically change the weather station
time in keeping with daylight savings time as recognize in the United States. The second
control option is wind speed scale. When turned on, the wind speed is in knots instead of
the normal mile per hour or kilometer per hour when in metric scale. The third control
option selects the manner in which the time is displayed. 24-hour military style or the AM
PM format. When enabled, the AM PM style is displayed. Aux display disable is the fourth
option, when it is on the temperature display cycles between the indoor and outdoor values
only. If you do not have options such as aux temperature or solar radiation aux display
disable should be turned on. Instant wind speed output is the fifth option. When turned on
the windspeed output to the RS-232 port is an instant reading rather than a one-minute
average.
To turn on the desired control options via the weather station display, refer to the table
below, add up the values of the controls that should be turned on and enter that value into
the weather instrument via the print set function (see page 12). The default value is 224.
For example if you wanted AM PM turned on and instant wind speed output turned on you
would add 32+128 which equals 192. Enter 192 into the weather instrument via the print
set function.
Option Value
Daylight savings mode on 8
Knots on 16
AM PM on 32
Aux disable on 64
Instant wind speed on 128
total
You may also change these functions via the software program TWICAL.
RS-232 Interface
The pin out on the RS-232 interface is as follows:
.DE 9 Plug Header
Pin 1 Pin 1 . . .
Pin 2 Pin 3 . . . Receive Data