.

Weather Report ™
Digital Weather Station

WR-25

Thank you for purchasing a Weather Report. Your package should contain a WR-25
console, wind sensor, temperature/humidity sensor, rain collector and this manual.

Normal Operation

When in normal operation (no buttons depressed). the instrument displays current
wind direction and speed, cycles current time and date, cycles current indoor,
outdoor and if selected, aux temperatures (if both the indoor and outdoor indicator
lights are extinguished, Aux. temperature is displayed) cycles current barometric
pressure, current relative humidity, and cycles daily, monthly and term cumulative
rainfall. By utilizing the hold buttons associated with each display, the user may
select the most important readings to the user. When wind speed exceeds 99 miles
per hour, a small green light will turn on between the digits of the wind speed
display.

Trend indicators (arrows) are located to the right of the temperature, relative
humidity, and barometric pressure displays. If, for example, the current relative
humidity was increasing. the up trend arrow would be lit. If there was no change, no
arrow would be lit.

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 INSTALLATION

We strongly suggest that all the weather station sensors be connected

to the weather station and tested prior to installation so that you may
become familiar with the operation of the instrument.

The WR-25 uses three sensors to gather weather data. The wind direction and
speed sensor, the temperature and humidity sensor (a small black box) and the
rain collector (see figure 1). The wind sensor and the rain collector are
designed to mount to a television type mast (not provided). The cables from
the sensors attach to the console via RJ-45 connectors in the rear of the unit.
Each sensor has its own color coded plug, yellow for wind, blue for
humidity/temperature and blue for rain. The blue connectors are
interchangeable with each other.

C A U T I O N !! :BE EXTREMELY CAREFUL NOT TO TOUCH ANY

HIGH POWER LINES DURING INSTALLATION OF THE VARIOUS
SENSORS!!!

The WR-25 wind direction and speed sensor is normally mounted on television
type antenna masts (see Figure 1). For best results the wind sensor should be
mounted at least 10 feet above the roof of the building. The higher the
installation, the more accurate the readings. There is one yellow cable
consisting of eight wires that must be strung from the wind sensor to the
console. The wind direction sensor is calibrated at the factory and should be
installed with the mounting arm pointed to the North. The wind sensor arm can
be mounted and calibrated in any direction, but it is more convenient to use
North as a reference. If calibration is necessary after the unit is already
mounted, pick a calm day or immobilize the wind vane by hand. Enter
calibration mode on the display (see page 9) and step the direction around
using the min or max key, or load the optional TWI_LOG program (see page
13) in your computer and change item 7, wind dir offset, until the proper
direction achieved.

The outside temperature/humidity sensor should be mounted under the eaves,

out of the rain and sun. The humidity sensor is light sensitive, if the humidity
sensor cover is left off allowing light to hit the sensor element the humidity will
read 0%. (If it is desirable to mount the temperature/humidity sensor directly on
the mast, the optional pagoda housing should be secured at the time of
purchase of the Weather Report.) One of the best places to mount this sensor
is on the north side of the building where it is shaded most of the year.
Remember, the sensor will detect the exact temperature and humidity where
the sensor is located. If it is located above an air conditioning unit, it will read
that artificially hot air -- location is very important! Ideally, the outside

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 temperature/humidity sensor should be mounted with the sensor facing down.
Mounting the sensor vertically is also satisfactory. Never mount the sensor face-
up, exposed to rain. Water will collect in the sensor, creating inaccurate
readings. Remove the four screws securing the cover of the
temperature/humidity sensor, exposing two mounting holes. Mount the sensor
utilizing the screws provided; replace the cover. This sensor has one blue cable
which must be connected into the weather station. The optional outside
temperature/humidity pagoda should be mounted about two feet under the wind
sensor. Again we suggest at least a ten foot mast to overcome the artificially
high readings generated by a hot roof.

The rain collector is normally mounted on the mast. It should be mounted as

low as possible to reduce windage and to limit movement of the mast which
can cause false readings. The collector should be mounted in a manner that
allows rain to enter the collector unencumbered by surrounding obstacles. Use
a bubble level to make sure that the collector is perfectly level with the ground.
Failure to level the collector will cause inaccurate rainfall readings. The rain
collector has one blue cable which must be connected to the console.

Plug the sensor cables and the serial cable into the connectors in the rear of
the console. Plug the wall transformer into a 120V wall socket to power up the
unit.

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 Report

Date/Time Hold

Windchill

Temperature Hold
Comfort

Barometer/Humidity Hold
Average Last

Rainfall Hold

Select Clear Min Max Scale

Weather Report

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 OPERATION

FUNCTION KEYS

Select The select key, when pressed at the same time as the report key,
puts the unit into time/date and lunar/tide cycle set mode. When the select
and scale keys are pressed at the same time, the unit enters the calibration
set mode. When the select and average keys are pressed at the same time,
the unit enters the printer set mode. When select and last are pressed at the
same time the instrument enters rainfall history set.

Clear The clear key, when depressed, causes the unit to display the date
and time of the last memory clear. Pressing clear and minimum at the same
time clears the unit's memory. Pressing clear and maximum at the same
time also clears the unit's memory. Pressing clear and last rain clears the
term rainfall.

Minimum The minimum key, when repeatedly depressed, steps through

wind-speed/wind-direction, temperature, barometric pressure, humidity and
rainfall rate, displaying the minimum reading of each of these functions since
the last time the unit memory was cleared. In addition to the minimum reading,
the unit displays the date and time of its occurrence. The date and time display
must not be on hold in order to display both date and time.

Maximum The maximum key functions the same as the minimum key, but
with maximum readings.

Scale The scale key changes the displays from reading in English values to
those of Metric values. The inch light near the rain display is on when the
instrument is in English mode. The English to Metric equivalents are miles per
hour or Knots to Kilometers per hour, Fahrenheit to Celsius, Inches of Mercury
to Millibars, Inches of rain to Centimeters of rain. Pressing the select and
scale key at the same time puts the unit into calibration mode.

Report Pressing the report key sends current data to the serial port. The
report key, when depressed at the same time as the select key, puts the unit
into its time setting function.

Hold The hold key when depressed (toggled on) stops the cycling between
two different parameters on the same display.

Windchill The windchill key, when depressed, calculates and displays,

using wind speed and temperature, a factor which represents how cold the

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 temperature and wind feel to bare flesh. Pressing the windchill and the
comfort key at the same time will display the dew point.

Comfort The comfort key, when depressed, calculates and displays, using
humidity and temperature, a factor which represents how warm the
temperature feels.

Last The last key, when pressed, displays the time and date of the last
rainfall and its rainfall rate. When pressed at the same time as the clear key,
the instrument clears the term rainfall register. When last pressed at the
same time as select, the unit enters into rainfall history mode.

Average When toggled on, the dot below the Av light (near the wind speed
display), indicating that the unit is in wind averaging mode. When in wind
averaging mode, the instrument displays the previous minute's average wind
direction and speed. When pressing the average key and the select key and
the select key at the same time, the unit enters into the printer set mode.

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 ¸Time Setting Mode:

Press select and report at the same time, and the last two digits of the year
displays (i.e., 90 = 1990). Press the maximum button to advance the year; the
minimum button to retard the year.
.
Report

Time/Date Hold

Windchill

Temperature Hold 90
Comfort

Barometer/Humidity Hold

Last

Rainfall Hold

Select Clear Minimum Maximum Scale

WEATHER REPORT

Press select a second time, and the month will be displayed (i.e., 1 = Jan. and
12 = Dec.). Press the maximum and minimum key to set the month.

Report

Hold 12 - - AM
PM

Press select a third time, and the day of the month (1-31) digits light. Press the
maximum to advance the date and minimum to retard the date.

Report

Hold - - .25 AM
PM

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 Press select a fourth time, and the day of the week is displayed (1 = Sunday, 2
= Monday, 3 = Tuesday, 4 = Wednesday, 5 = Thursday, 6 = Friday, and 7 =
Saturday. Press the maximum button to advance the day of the week and
minimum to retard.

Report

Hold 04 AM
PM

Press select a fifth time (note the colon between the hours and minutes), and
the unit will display the time in military hour style. Press the maximum button to
advance the hour or minimum to retard the hour.

Report

Hold 23 :- - AM
PM

Press select a sixth time (note the colon between the hours and minutes), and
the unit will display minutes. Press the maximum or minimum buttons.

Report

Hold - - .42 AM
PM

Press select a seventh time (note only the right two digits); the unit will display
seconds. Press the maximum or minimum buttons to set the seconds.
(note: the seconds is updated on the display only when the maximum or
minimum button is being depressed).

Report

Hold 22 AM
PM

Press select a eighth time (a single dot at the bottom separates the hour and
minute); the lunar/tide clock will display the number of hours in a cycle.

Press the maximum or minimum buttons to set the hours of the cycle
(explained in the Lunar Tide section).

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 Report

Hold 12.- - AM
PM

Press select an ninth time (the single dot remains at the bottom, separating the
hour and minute); the lunar/tide clock will display the minutes of the cycle. Press
the maximum or minimum buttons to set the minutes of the cycle.

Report

Hold - -.51 AM
PM

Press select a tenth time (the single dot is now located at the top, between the
hour and minute); the peak of the cycle hour (usually high tide) will be displayed.
Change as desired.

Report

Hold 09 ' - - AM
PM

Press select an eleventh time (the single dot remains at the top between the
hour and minute), and the minutes of the peak hour will be displayed. Change
as desired.

Report

Hold - -' 31 AM
PM

Press select a twelfth time and the unit will return to normal display mode.

Calibration mode

See the calibration reference section on page 18 for other details.

Calibration Method

Press select and scale at the same time, and the unit enters the calibration
mode, first displaying the Aux temperature. (If the Aux dip switch is in the off

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 position, the unit will skip this calibration). If necessary, press the maximum or
minimum key to enter the proper temperature.

Report

Time/Date Hold

Windchill

Temperature Hold 76
Comfort

Barometer/Humidity Hold

Last

Rainfall Hold

Select Clear Minimum Maximum Scale

W EATHER REPORT

Press select a second time and the unit displays the indoor temperature.
Press the maximum or minimum key to enter the actual temperature.

Windchill
Hold
Indoor
O utdoor - -.73
Press select a third time - the unit displays the outdoor temperature. Press the
maximum or minimum key to enter the actual temperature.

Windchill
Hold
Indoor
O utdoor - -.28
Press select a fourth time, and the unit displays barometric pressure. Press the
maximum or minimum key to enter the actual barometric pressure.

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 Comfort

Hold 29 .9 2
Press select a fifth time, and the unit displays in the rainfall window: 0, 1, 2, or
3. 2 is the normal display. Press the maximum or minimum key to enter the
proper number (see calibration reference for more information).

Last

Hold
D aily
Monthly 2 IInch
Term

Press select a sixth time; the unit will display in the rainfall window a reading
ranging from .01 to .1. Press the maximum or minimum button to enter the
proper number.

Last

Hold
D aily
Monthly .01 IInch
Term

Press select a seventh time - the unit displays wind direction. Press the
maximum or minimum key to enter the actual wind direction.

Press select an eighth time - the unit will return to the normal display mode.

Humidity Sensor Calibration

This function is only used if a new humidity sensor is installed. Press select and
humidity hold to enter this mode. The first number to appear is the voltage at
0% humidity that the sensor outputs. Press select again and a second number
will appear. This larger number is the voltage that the sensor outputs at 75%
humidity. The humidity calibration numbers are found on the
humidity/temperature sensor and on the back of the instrument console. These
calibration numbers are supplied to us by the manufacturer of the sensor and
are normally not changed.

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 Print Set

Pressing select and average at the same time puts the unit into print set mode.
The unit first displays the report interval in number of hours between lines of
printed information. Press the maximum and minimum keys to change
display.

Pressing select a second time displays the number of minutes between lines of
information. Press the maximum and minimum keys to change the display.

Press select a third time, and the minimum/maximum and form feed options 0
through 7 may be selected as illustrated in the table below:

SETTINGMIN/MAX FORM FEED RAIN RATE

0 OFF OFF OFF

1 ON OFF OFF
2 OFF OFF OFF
3 ON ON OFF
4 OFF OFF ON
5 ON OFF ON
6 OFF OFF ON
7 ON ON ON

When rain rate is off, term rain is substituted.

Press select a fourth time to select the baud rate of the serial output. Press the
maximum and minimum keys to change the display.

Press select a fifth time to select log interval hours. The log interval tells the
Weather Report to send data to the internal memory and at what interval to do
so. Press the maximum or minimum to change the display.

Press select a sixth time to select the log interval minutes. Press the maximum
or minimum to change the display.

Press select a seventh time and a number between 0 and 255 will appear in
the pressure/humidity window which represents output options. Enter the
proper option number by pressing the maximum or the minimum keys. The
output options control the selection of such things as AM PM, wind speed
knots, auxiliary display and average wind speed output. (Look at the first item

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 in the reference section called control options for more information, page
20.)

Press select a eighth time and the unit will return to a normal display.

Communicating with the WR-25

Connect the 9pin female DB-9 plug of one end of the supplied RS-232 cable
into the male DB-9 plug of the WR-25. Plug the other end of the RS-232 cable
using either the DB-25 or the DB-9 female plugs into a open com port on your
computer (all com ports on computers are either 9pin male or 25 pin males). If
you do not use the supplied cable, please note that a null modem adapter is
required to properly talk to a computer, the supplied cable has one built in.

The WR-25 via its RS-232 interface can communicate with computers running
either the optional TWI-LOG program or standard computer communication
programs. The WR-25 responds to the following ASCII characters sent by
computers, with ASCII space delimited text.

Command Characters

V- Firmware version number

S- Firmware Serial#
I- Unit ID number
C- Unit responds with a daily minimum and maximum of all parameters, then
clears. The rainfall rate is present rather than term rain.
Sample
MIN 07/24/90 SW 00MPH 070F 067F 067F 054% 30.00" 00.19"D 01.38"M 00.00"R
MAX 07/24/90 SSE 25MPH 052F 071F 092F 099% 30.06" 00.19"D 01.38"M 00.72"R

c- Unit responds with a daily minimum and maximum of all parameters, then
clears. The term rain is present rather than rainfall rate.
Sample
MIN 07/24/90 SW 00MPH 070F 067F 067F 054% 30.00" 00.19"D 01.38"M 00.00"T
MAX 07/24/90 SSE 25MPH 052F 071F 092F 099% 30.06" 00.19"D 01.38"M 00.72"T

The minimum and maximum associated with the C command is cleared

automatically at midnight
D- Unit responds in an identical manner as the C command but does not clear
the system memory.
d- Unit responds in an identical manner as the c command but does not clear
the system memory
E or e- Unit responds with minimum and maximums along with date and time of
occurrence. This uses the same buffer as the c and d command.

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 M- Unit responds with all minimums and maximums with the date and time of
their occurrence, then clears.
m- Unit responds in an identical manner as with the M command but does not
clear the system memory.

Sample
TA 10:33 038F TA 09:32 056 F
TO 04:15 075F TI 15:03 080 F
TO 10:33 038F TO 16:10 056 F
RH 15:44 033% RH 01:40 060 %
BP 16:11 29.57” BP 10:20 30.15"
RD 04/29 00:00“ RT 01:00"
RM 03.32“ WS 00:00 000 MPH 048
The system has two completely separate memory buffers (C and M
commands).

R- Unit responds with current conditions. The rainfall rate is present rather
than the term rain. (Note: in 30.04R the “R” denotes rising pressure)
Sample
5:15 07/24/90 SSE 04MPH 052F 069F 078F 099% 30.04R 00.19"D 01.38"M 11.78"T

r- Unit responds with current conditions. The term rain is present rather than
the rainfall rate. (Note: in 30.04F the “F” denotes falling pressure, a “S”
character denotes steady pressure.)
Sample
5:15 07/24/90 SSE 04MPH 052F 069F 078F 099% 30.04F 00.19"D 01.38"M 00.72"R

K- Unit responds with current calculated values, for dew point, Windchill and
heat index.

Twi_Log Program

The TWI_LOG program. TWI_LOG is an IBM PC software utility which enables

the user with special applications to communicate and set various functions of
the WRL. Insert the TWI_LOG diskette into your disk drive and type TWI_LOG
then press enter.

Note: TWI LOG is no longer sent with the weather stations. The TWI Cal
Windows program has replaced TWI_LOG and is included with the weather
station. If for some reason you still need the TWI_LOG program it is available
on our website at www.texas-weather.com.

• The first screen of the program will look this:

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 1 Com1
2 Com2
3 Modem
enter index of station name: ?

Pressing selection 1 accesses the WRL, if it is plugged into com1.

Pressing selection 2 accesses the WRL if it is plugged into com2.

Pressing selection 3 accesses the WRL via modems and phone lines.

WRL access can be modified by editing the twi_com.dat file on your TWI_LOG disk. To
change the configuration load twi_com.dat into a text editor and change to your preference.
The first station in this example is identified as green. It is set up on com 1 at 2400 baud, no
parity, eight data bits and one stop bit. BIN, DSO, CD0, and CS0 are various configuration
parameters that must be in the string. The TWI station is configured as a remote unit. A
modem would be connected to com1 set at 2400 baud, no parity, 8 data bits and one stop bit.
The ATE0QV1M1X4S0=0 is the modem configuration string required by this particular
modem. The DT1,214,234-1309 is the phone number where the remote unit and its modem
are located. Please note that TWI_LOG does not support Com3 or Com4.

Sample twi_com.dat file

Com1 COM1:2400,N,8,1,BIN,DS0,CD0,CS0
Com2 COM2:2400,N,8,1,BIN,DS0,CD0,CS0
Modem COM1:2400,N,8,1,BIN,DS0,CD0,CS0 ATE0Q0V1M1X4S0=0 DT1,214,234-1309

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 • After you make your selection the following screen will appear:

TWI Main Menu

F1 Report Output
F2 Retrieve Log Data
F3 Display Log Data
F4 Purge Log Data
F5 Display Cal Data
F6 Graphic Log Data
F7 Print Log Data
F8 Get Version again
F9 Set Date/Time
F10 Exit Program

Pressing F1 enables the user to communicate with the WRL using all the
commands referred to in the Communicating with the WRL (page 14) Section
of this manual.

Pressing F2 instructs the computer to retrieve data from the WRL and place
that data in a file on the disk drive. Only new data will be written to disk during
successive retrievals. Any number of WRL’s or WPS’ can be accessed and
their data will be put in different files on the drive. There will be two files written
on to your drive, log_day.??? and log_rec.???. Log_day. ??? has the
minimum and maximum values and log_rec.??? has the individual records.
Each file has a file extenuation that corresponds to the ID number of each
weather unit. The ID number can be changed through the calibration (F5)
routine in Twi_Log. For example if you downloaded data from a unit with the ID
of 124 the data for that unit would be found in log_rec.124.

Pressing F3 displays the data written on disk. Press the up arrow key to go up
or down one record at a time, press the page up or down keys to display one
screen of data at a time, press the home or end key to go to the top or bottom
of the file. The delete key takes all records prior to that displayed at the top of
the screen and transfers that data to an archive file arc_log.??? file. The
extension ??? will be the same as the unit number. The data that is archived is
removed from the current display and log file.

Pressing F4 purges any duplicate data written on disk.

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 Pressing F5 -the calibration screen.

Inx Value Description Inx Value Description

1 85 temp:aux 20 94 clock years

2 65 temp: inside 21 11 clock month
3 73 temp: outside 22 22 clock day of month
4 29.92 barometric pressure 23 2 clock day of week::Mon:
5 0 elevation 24 11 clock hours
6 0.750 MVP @ 0.0% HR 25 24 clock minutes
7 3.255 MVP @ 73.3% HR 26 54 clock seconds
8 8 wind dir. offset 27 0 log interval hrs
9 2 rain inc flag 28 30 log interval minutes
10 0.01 rain inc value 29 0 Scale: 0=FPS 1=CGS
11 0.00 rain fall: daily 30 0 ID number
12 0.00 rain fall: monthly 31 8 POR Counter
13 0.00 rain fall: term 32 0 RR Interval , sec
14 0 report interval HI 33 0 Wsp units : MPH
15 0 report interval LO 34 1 Time dispaly : AMPM
16 0 report Min/Max :Off 35 1 aux Temp
17 4 report end of day 36 1 Wsp/Wdir
18 0 report interval Units: M:S: 37 4 baud rate: 2400
19 0 report character: r 38

enter parameter index: ?

Note: This screen and its index numberswill vary depending on what options
are installed.

Any item in this index can be changed by:

(1)entering the index number
(2)entering the new value
(3)entering Y to set the new value or N to reject the new value.
1) Aux temperature calibration
2) Inside temperature calibration
3) Outside temperature calibration
4) Barometric pressure calibration
5) Elevation correction ( not used)
6)1st humidity sensor calibration factor
7) 2nd humidity sensor calibration factor
8) Wind direction calibration, increase number to move clockwise or decrease
number to move counterclockwise.
9) Rain collector type (most rain collectors are type 2 including TWI, 0 turns of
the rain collector counter)

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 10) Rain increment value ( the value that is added for each click of the rain
collector, most rain collectors should be set for 0.01 including TWI)
11) Daily rainfall history register
12) Monthly rainfall history register
13) Term rainfall history register
14) Report output interval HI, sets the automatic data dump interval to the
RS232. Value can be in hours or minutes depending on the setting of the
report interval units (19)
15) Report output interval LO, sets the automatic data dump interval to the
RS232. Value can be in minutes or seconds depending on the setting of the
report interval unites (19).
16) Report Min/Max turns on the min-max function for the log and the report
output (for the printer).
17) Report end of day- sends a formfeed at midnight to the RS-232 (for the
printer).
18) Report Interval Units sets the ouput values to minutes or seconds.
19) Sets which command the report output will use, r, R, q or Q.
20) Sets the years..
21) Sets the month.
22) Sets day of month.
23) Sets the day of the week. (1=Sunday, 2=Monday, 3= Tuesday,
4=Wednesday, 5=Thursday, 6= Friday, 7=Sunday)
24) Sets hours in 24 hour format..
25) Sets minutes
26) Sets Seconds.
27) Sets the logging interval hours (saves data in the units memory when set)
28) Sets the logging interval minutes.
29) 0 for English or 1 for Metric scale
30) Sets the ID number (0 through 255)
31) Displays number of power ups (0 through 255)
32) Displays the rainfall rate interval in minutes.
33) Wind Speed scale, changes wind speed to knots when set to 1. A 0
setting when in English will output miles per hour and a 0 when in metric will
output kilometers per hour.
34) Time display, when set to 0 the unit will display time in a 24 hour military
format. When set to 1 the unit will be in AM or PM.
35) Aux disable, when set to 0 will cycle the temperature display through three
values, indoor temp, outdoor temp and the aux value (aux temperature or solar).
When Aux disable is set to 1 the temperature display will cycle through indoor
and outdoor temperatures only.
36) Wind speed and direction, when set to 0 the unit outputs one minute
average wind data to the RS-232 port. When set to 1 the output is instant. This
setting does not effect the display which has its own button.
37) Selects baud rate, 0=38.4 1=19.2, 2=9600, 3=4800, 4=2400, 5=1200,
6=600, 7=300. (Warning! Do not change this number unless you

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 understand that you will lose communication with the WRL until the
host baud rate is also changed. Also note that TWI_LOG does not
support a baud rate fo 38.4.)

Pressing F6 will graph the data, if you have a VGA monitor.

Pressing F7 will take the current binary data file and convert it to a text file. The
text file will be named prn_day.??? for the minimums and maximums and
prn_rec.??? for the record. The extension of the files will correspond with the
ID number of the weather unit whose record is being converted.

Pressing F8 will display the version number of the firmware in the WRL.

Pressing F9 will set the weather station time to match that of the computer.

Pressing F10 will exit the program.

Direct data retrieval from a DOS prompt may be accomplished by entering

TWI_LOG ? /dl, where the ? equals the line of the unit as defined in the
twi_com.dat file. For example entering TWI_LOG 1 /dl would access in our
current setup the Green unit. Entering TWI_LOG 2 /dl would access the Red
unit. After the data is retrieved the program will return to the DOS prompt. For
automatic data retrieval of multiple units at a predetermined time a commercial
PC scheduling program may be use.

You may look at data that is stored on disk even if you are not tied directly to
that weather station by entering TWI_LOG /ixxx where xxx equals the ID number
of the unit (the unit ID may be set using the F5 function key within TWI_LOG).
At the DOS prompt TWI_LOG /I135 would access the data for unit 135.
REFERENCE

Control Options

Control options can be changed through the print set routine, see page 13 for
directions on changing this number. These control options can also be changed
through the optional TWI_LOG program F5 screen. The first 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 second control option selects
the manner in which the time is displayed. 24 hour military style or the AM PM format.
When on, the AM PM style is displayed. Aux display disable is the third 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 fourth option. When turned on

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 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 13). 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
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 TWI_LOG F5 routine
RS-232 Interface

RS-232 Interface

The pin out on the RS-232interface is as follows:

.DE 9 Plug Header
Pin 1 Pin 1 . . .
Pin 2 Pin 3 . . . Receive Data
Pin 3 Pin 5 . . . Transmit Data
Pin 4 Pin 7 . . . . Data Set Ready
Pin 5 Pin 9 . . . Signal Ground
Pin 6 Pin 2 . . . Data Terminal Ready (must be true to send data)
Pin 7 Pin 4 . . . Clear to Send
Pin 8 Pin 6 . . . Request Send
Pin 9 Pin 8 . . .

Modem Installation

A modem may be used with the WR-25 for remote operations. A modem
adapter which is available from TWI must be used to properly connect the
weather station to a modem. For auto answering, an auto-answering modem
with non-volatile memory must be used. The WR-25 does not send AT control
signals, so in order for the modem to properly answer, the modem must be told
(programmed with a computer) to answer on whichever ring the user desires.

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 (Modems pre-programmed in non-volatile memory are available from Texas
Weather Instruments.)

Typical Output

Temperature Daily Monthly Rainfall

Time Date Direction Speed Aux Indoor Outdoor Humidity Pressure Rain Rain Rate

15:00 07/24/90 SE 03MPH 070F 069F 082F 090% 30.04S 00.01"D 01.20"M 00.00"R
15:15 07/24/90 SSE 04MPH 052F 069F 078F 099% 30.04S 00.19"D 01.38"M 00.72"R
15:30 07/24/90 SE 02MPH 065F 068F 072F 089% 30.04S 00.19"D 01.38"M 00.00"R
MIN 07/24/90 SW 00MPH 070F 067F 067F 054% 30.00" 00.19"D 01.38"M 00.00"R
MAX 07/24/90 SSE 25MPH 052F 071F 092F 099% 30.06" 00.19"D 01.38"M 00.72"R

Computer Interface

The WR-25 may be plugged directly into computers equipped with RS-232
interfaces. Data may be captured to disk by using a communication program
(i.e., Crosstalk or Procomm for the IBM-PC) or the TWI_LOG program. The
WR-25 sends data in a serial format at 300 to 19.2 baud rate, 8 data bits, no
parity and one stop bit.

Note: The WR-25 has two separate minimum and maximum memories.
Clearing the M command minimum and maximum memory will not affect the
C command minimum and maximum memory and vice-versa. The
printer/computer memories clear at 12:00 midnight every day and/or when
the c key is pressed on the computer console.

Calibration Reference

The Weather Report comes pre-calibrated from the factory, but it is possible to
recalibrate most of the primary functions of the instrument using the F5 function
of the TWI_LOG program.

Barometric Pressure

Normally, barometric pressure is the only item that needs to be recalibrated

(adjusting for altitude). The proper local barometric pressure can be obtained
from the local news. Set the barometric pressure reading you obtained from the
local media by using the calibration mode function.

Temperature

If for some reason you suspect that the temperature is not calibrated properly,
use a quality bulb thermometer with which to calibrate. Remember, the WR-25
will be most accurate near the temperature at which it was calibrated.

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 Humidity Sensor Calibration

The humidity sensor is calibrated by inputting two voltages found on humidity

sensor into the WR-25. This may be done by utilizing the TWI_LOG program
calibration routine. Index 5 is the voltage at 0% humidity that the sensor
outputs. Index 6 represents the voltage that the sensor outputs at 73%
humidity. The humidity calibration numbers are found on the
humidity/temperature sensor and on the back of the instrument console. These
calibration numbers are supplied to us by the manufacturer of the sensor and
are normally not changed. If it appears that re-calibration is necessary, try
increasing or decreasing index 6.

Rainfall

The WR-25 is compatible with most rain collectors on the market today. The
rain inc flag is only utilized to tell the WR-25 what type rain collector is installed.
Actual measurement calibration is accomplished inside the rain collector by
adjusting two stainless steel screws.

Setting 0 turns the rainfall counter off. Setting 1 or 2 tells the WR-25 to react
with one count for every momentary switch closure of the rain collector.

Setting 3 tells the WR-25 to react with one count for every rain collector switch
transition from an open or closed state. Rain inc value tells the WR-25 how
much rainfall to display for each count. Use the TWI_LOG F5 calibration routine
index 8 and 9 to change these settings.

THE PROPER SETTING FOR THE TEXAS WEATHER INSTRUMENTS RAIN

COLLECTOR IS "2" FOR THE COUNT AND ".01" FOR THE
MEASUREMENT.

The daily rainfall register is zeroed every day at midnight. The monthly rainfall
register is zeroed on the last day of each month at midnight. The term rainfall
register is never zeroed automatically, it must be manually zeroed through the
TWI_LOG calibration routine or by pressing last and clear on the display at the
same time.

Report Flag

The report flag selects the format of the RS-232 output and may be changed
via the display using the print set routine or by using the TWI_LOG program
calibration routine (F5) item 15 report flag (normally used when outputting
directly to a printer).

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 SETTINGMIN/MAX FORM FEED RAIN RATE

0 OFF OFF OFF

1 ON OFF OFF
2 OFF OFF OFF
3 ON ON OFF
4 OFF OFF ON
5 ON OFF ON
6 OFF OFF ON
7 ON ON ON

When rain rate is off, term rain is substituted.

Min/Max, when selected outputs at midnight the minimum and maximum value
for the day. The report function must be on in order for the output to occur. This
function must also be on if you want the minimum and maximum to be logged to
memory.
Form Feed, when selected sends a form-feed character at midnight, which is
normally desirable if a printer is directly hook up to the RS-232 interface.
Rainfall rate, when selected outputs rainfall rate instead of term rain in the
report function.

Special Key Functions

Select + Report = Time Set Function

Select + Scale = Calibration Set Function
Select + Average = Printer Set Function
Select + Humidity Hold = Humidity Calibration Set
Clear + Last = Clears Last Rain
Select + Last = Enters Rainfall History Mode
Clear + Maximum = Clears all Maximums and Minimums
Clear + Minimum = Clears all Maximums and Minimums
Clear +Scale +Average = Performs a cold boot
Windchill + Comfort = Dewpoint

Keys must be pressed precisely at the same time to perform the desired
function.

Lunar Tide Cycle

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 The lunar tide cycle function may be set to display the position of the moon in
relation to its revolution around the earth. The moon's position is the primary,
although not the only, factor in predicting high and low coastal tides. High tides
are generally present when the moon is overhead or when the moon is 180
degrees from overhead. Low tide is generally present when the moon is in the
90 degree or the 270 degree position. This method of predicting tide works
well on the West and East coasts. On the Gulf coast, this method is not as
successful.

To set the tide clock, follow the directions in the time set function. The first item
to be entered is the tide cycle duration. The tide cycle duration may be set from
1 to 99 hours. Twelve hours and fifty one minutes is the normal number for a
tide clock. The second item to be entered is the time of the high tide. This
information is generally found in the newspaper. If predicting the tide does not
apply to your area, any cycle that lasts between 1 and 99 hours may be
displayed.

Clearing the Memories

When the clear button is depressed and held, the unit will display the date and
time the instrument's memory was last cleared. In order to clear the memories,
the clear and minimum button must be pushed at the same time. The items
cleared are as follow: minimum and maximum, wind speed, temperature
(indoor, outdoor, and aux), barometric pressure and humidity. Daily rainfall is
cleared automatically at midnight every night. Monthly rainfall is cleared
automatically at midnight on the last day of the month. Term rainfall may be
cleared at any time by the user by depressing clear and last rain at the same
time. The term rainfall register may be used for any term desired by the user,
but is most commonly used to account for yearly rainfall. The memories can
also be changed by using TWI_LOG.

Rainfall history mode

If the information is available, the actual daily, monthly and term rainfall amounts
that occurred before the installation of the weather station may be manually
entered. To do so enter the rain history mode, by pressing select and last at
the same time. The first item to appear will be the dally rainfall total. Press
minimum or maximum to input the correct amount. Press select again and
the monthly rainfall amount will appear. Press select again and the unit will
display term rainfall, change as desired. Press select again and the unit will
return to normal mode.

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 Note: strip
must be on
the left side

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Figure 2

RS232 pig tail

Texas Weather Instruments, Inc.

2 4 6 8 10

RS232 10 pin header

1 3 5 7 9

.75 amp fuse

25
Aux (solar) and Indoor Outdoor temperature, humidity
temperature- Red and rain- Blue. Either jack if
Wind Speed-Yellow Either jack if installed installed.
Power
9vdc

Power
LED
1 2 3

-
+

WR-25 Instruction Manual

 FCC RADIO FREQUENCY INTERFERENCE STATEMENT

NOTE: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15, Subpart B, of the FCC
Rules. This equipment generates, uses, and can radiate radio frequency
energy. If not installed and used in accordance with the instructions, may
cause interference to radio communications.
The limits are designed to provide reasonable protection against such
interference in a residential situation. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does
cause interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try and correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna of the affected radio or
television
• Increase the separation between the equipment and the affected
receiver.
• Connect the equipment and the affected receiver to power outlets on
separate circuits.
• Consult the dealer or an experienced radio/TV technician for help.

MODIFICATIONS
Changes or modifications not expressly approved by Texas Weather
Instruments, Inc. could void the user's authority to operate the equipment.

SHIELDED CABLE
Shielded cables must be used with this equipment to maintain compliance
with FCC regulations.

1/6/96

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 Troubleshooting

Instrument display does not come on.

Make sure receptacle has power by plugging another appliance into it.
Check that the transformer is properly wired into instrument (the leads could
be reversed or not seated properly). Check that the fuse is intact (.75 amp
fuse inside the case). Try unplugging the transformer to reset the computer.

Instrument display works but does not read correctly.

Make sure you are displaying the proper scale (English or Metric).

Check that all connectors in the back of the unit are properly seated and that
sensor wires are on their proper junctions and secure (see to Figure 2).

Try unplugging then replugging the transformer to reset the weather station.

Check the fuse in the back of the instrument If it feels hot, replace with a .75
amp fuse available at most electronic stores.

Humidity reads 0% during the day.

If your humidity sensor is in a plastic box, make sure that is in the shade and
has the cover attached, the humidity sensor is light sensitive (does not apply
to pagoda installations).

Rain collector appears to be counting double that of the actual rainfall.

Check that the rainfall count is set on 2.

If you still experience problems, please call 800-284-0245 and ask for Technical
Support, we will be happy to help you.

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 Index
humidity sensor calibration factor, 16

A
I
arc_log.???, 15
ASCII characters, 12 ID number, 17
AT control signals, 19 Inside temperature calibration, 16
Aux disable, 17 INSTALLATION, 2
Average, 5
average wind data, 17
L
B Last, 5
logging interval hours, 17
Barometric Pressure, 20 logging interval minutes, 17
Barometric pressure calibration, 16 Lunar Tide Cycle, 22
baud rate, 17 lunar/tide cycle, 4

C M

Calibration Method, 8 Maximum, 4

Calibration mode, 8 Minimum, 4
Calibration Reference, 20 minutes, 17
Clear, 4 modem adapter, 19
Clearing the Memories, 23 Modem Installation, 19
Comfort, 5 month, 17
Command Characters, 12
Communicating with the WR-25, 11
Computer Interface, 20 N
Control Options, 18
Normal Operation, 1

D
O
Daily rainfall history register, 17
daily rainfall register, 21 OPERATION, 4
day, 17 Outside temperature calibration, 16
Dewpoint, 22

P
F
pagoda, 3, 26
FCC RADIO FREQUENCY INTERFERENCE Print Set, 11
STATEMENT, 25 prn_day.???, 18
FUNCTION KEYS, 4 prn_rec.???, 18

H R

Hold, 4 rain collector, 17, 21

hours, 17 Rain collector type, 16
Humidity Sensor Calibration, 10, 20 Rain increment value, 17

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 Rainfall, 21 Term rainfall history register, 17
Rainfall history mode, 23 tide clock, 23
rainfall rate interval, 17 Time display, 17
Report, 4 Time Setting Mode , 6
Report Flag, 21 Trend indicators, 1
Report Interval Units, 17 twi_com.dat, 13
report output, 17 TWI_LOG, 13, 20
Report output interval HI, 17
Report output interval LO, 17
RS-232, 12, 19, 20, 21, 22 W

Wind direction calibration, 16

S Wind Speed scale, 17
Windchill, 5, 13
Scale, 4, 17
Seconds, 17
Select, 4 Y
Special Key Functions, 22
years, 17

Temperature, 20
temperature/humidity sensor, 2

Texas Weather Instruments, Inc. 2 WR-25 Instruction Manual

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