Texas Weather Instruments Weather Report WR-25 User manual

Texas Weather Instruments, Inc. 1WR-25 Instruction Manual
.
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.

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

Texas Weather Instruments, Inc. 3WR-25 Instruction Manual
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.

Texas Weather Instruments, Inc. 4WR-25 Instruction Manual
Report
Hold
Windchill
Hold
Comfort
Hold
Last
Hold
Select Clear Min Max Scale
Barometer/Humidity
Rainfall
Average
Date/Time
Weather Report
Temperature

Texas Weather Instruments, Inc. 5WR-25 Instruction Manual
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

Texas Weather Instruments, Inc. 6WR-25 Instruction Manual
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.

Texas Weather Instruments, Inc. 7WR-25 Instruction Manual
¸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.
.
Time/Date
Temperature
Barometer/Humidity
Rainfall
WEATHERREPORT
ClearMinimumSelectMaximumScale
Hold
Last
Hold
Comfort
Hold
Windchill
Hold
Report
90
Press select a second time, and the month will be displayed (i.e., 1 = Jan. and
12 = Dec.). Press themaximum and minimum key to set the month.
Report
Hold
AM
PM 12 --
Press select a third time, and the day of the month (1-31) digits light. Press the
maximum to advance the date andminimum to retard the date.
Report
Hold
AM
PM
--.25

Texas Weather Instruments, Inc. 8WR-25 Instruction Manual
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
AM
PM 04
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
AM
PM 23:--
Press select a sixth time (note the colon between the hours and minutes), and
the unit will display minutes. Press themaximum or minimum buttons.
Report
Hold
AM
PM --.42
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
AM
PM 22
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).

Texas Weather Instruments, Inc. 9WR-25 Instruction Manual
Report
Hold
AM
PM 12.--
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
AM
PM --.51
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
AM
PM 09'--
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
AM
PM --'31
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

Texas Weather Instruments, Inc. 10 WR-25 Instruction Manual
position, the unit will skip this calibration). If necessary, press the maximum or
minimum key to enter the proper temperature.
Time/Date
Temperature
Barometer/Humidity
Rainfall
WEATHERREPORT
ClearMinimumSelectMaximumScale
Hold
Last
Hold
Comfort
Hold
Windchill
Hold
Report
76
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
--.73
Indoor
Outdoor
Press select a third time - the unit displays the outdoor temperature. Press the
maximum or minimum key to enter the actual temperature.
Windchill
Hold
--.28
Indoor
Outdoor
Press select a fourth time, and the unit displays barometric pressure. Press the
maximum or minimum key to enter the actual barometric pressure.

Texas Weather Instruments, Inc. 11 WR-25 Instruction Manual
Comfort
Hold
29.92
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).
Hold
2
Daily
Monthly
IInch
Term
Last
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.
Hold
.01
Daily
Monthly
IInch
Term
Last
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.

Texas Weather Instruments, Inc. 12 WR-25 Instruction Manual
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 themaximum 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 themaximum or minimum to change the display.
Press select a sixth time to select the log interval minutes. Press themaximum
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

Texas Weather Instruments, Inc. 13 WR-25 Instruction Manual
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 Ccommand is cleared
automatically at midnight
D- Unit responds in an identical manner as theC command but does not clear
the system memory.
d- Unit responds in an identical manner as the ccommand 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.

Texas Weather Instruments, Inc. 14 WR-25 Instruction Manual
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 Mcommand 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:

Texas Weather Instruments, Inc. 15 WR-25 Instruction Manual
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

Texas Weather Instruments, Inc. 16 WR-25 Instruction Manual
•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 theCommunicating 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.

Texas Weather Instruments, Inc. 17 WR-25 Instruction Manual
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)

Texas Weather Instruments, Inc. 18 WR-25 Instruction Manual
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 dayof 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) 0for 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 intervalin 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

Texas Weather Instruments, Inc. 19 WR-25 Instruction Manual
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

Texas Weather Instruments, Inc. 20 WR-25 Instruction Manual
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.