Weather Report Logger™
Digital Weather Station
WRL Solar Model
Thank you for purchasing a Weather Report. Your package should contain a WRL console, wind sensor, solar radiation sensor temperature/humidity sensor, rain collector serial cable and a diskette that contains the TWI_LOG software. The WRL is unique because it can be programmed and queried by both the bottons on the display and by PC via the RS-232 serial port. Also data can be saved internally or by an external device via its RS-232 port. By accessing the logging mode (press select and time hold) the user can access previouslylogged data.
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, solar radiation (if both the indoor and outdoor
indicator lights are extinguished, solar 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 speeds
in excess of 99 miles per hour are experienced a small 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 on. If there was no change, no arrow would be turned on.
We strongly suggest that all the weather station cables and 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 WRL uses four sensors to gather weather data. The wind direction and speed sensor, the temperature and humidity pagoda, the solar radiaton sensor and the rain collector (see figure 1). All are designed to mount to a television type mast (not provided). The cables from the sensors go into a junction box, where they connect via RJ45’s to three multi-wire cables (intermediates) that are routed into the building and attached to the console. All cables are color coded. The yellow wind sensor cable plugs into the yellow RJ45 connector in the junction box. The yellow intermediate (wind) also plugs into a yellow RJ45 connector in the junction box. Plug the temperature/humidity pagoda and the rain collector (both colored blue) and the blue intermediate into the blue RJ45 connectors in the junction box. You may place any blue cable in to any blue RJ45 connector, the order does not matter. Plug the solar sensor and the solar intermediate both colored red in to the red connectors located in the junction box.
C A U T I O N !! :BE EXTREMELY CAREFUL NOT TO TOUCH ANY
HIGH POWER LINES DURING INSTALLATION OF THE VARIOUS
There is lightning protection (transient voltage suppressers) built into the
junction box. It is very important that the mast be grounded or the transient
voltage suppressers will not protect your instrument. The junction box picks
up earth ground through the hose clamps mounting the box. We suggest
that you install a copper grounding rod (available at Radio Shack) and run
the heavy gauge wire directly behind the hose clamps of the junction box.
This arrangement will ground your mast and your junction box.
The 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 twenty feet above the roof of the building. The higher the
installation, the more accurate the readings. There is one yellow cable that
must be strung from the wind sensor to the console via the junction box.
The wind direction sensor is calibrated at the factory and should be installed
with wind sensor arm pointed to the North. The wind sensor can be mounted and calibrated via the WRL console in any direction at al later time, but it is more convenient to use the precalibrated North 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 TWI_LOG program (see page 14) in your computer and change item 7, wind dir offset, until the proper direction achieved.
The outside temperature/humidity pagoda should be mounted about two feet under the wind sensor. Again we suggest a twenty foot mast for commercial installations to overcome the artificially high readings generated by a hot roof. Plug the temperature/humidity pagoda cable into the blue RJ45 connector in the junction box.
The solar sensor must be pointed South and must be free of shadows created
by the other sensors (near the top of the mast is normaly the best). Take care
that the sensor is perfectly level. The solar sensor has one red cable. Run the red solar sensor cable to the junction box and plug it in to the red connector.
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 via the junction box.
Mount the junction box under the rain collector using the hose clamps that are installed on the box (see figure 1). Remove the front cover of the junction box, inserting the connectors from the sensors and the cables from the console through the hole in the bottom of the junction box and then out of the front of the box. Plug all the yellow connectors in the yellow RJ45 connectors and all the blue connectors into the blue RJ-45 connectors and then pull the excess cable out of the j-box. Carefully seal the bottom hole in the box from the inside by using the plumbers putty provided. Be sure and replace the rubber gasket on the junction box so that it can remain watertight.
Plug the yellow intermediate cable (wind) into the yellow pigtail exiting the
back of the console. Do the same for the blue cable (temp/humidity & rain).
cables. Next plug in the serial cable into the connectors in the rear of the console and the proper serial port of your computer. If you are supplying your own serial cable be sure that you have a null modem adapter attached to the cable or that the cable is a null modem cable. The cable with four ends that is supplied with your instrument has a null modem built in. Plug the wall transformer into a 120V wall socket to power up the unit.
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. When select and time hold are pressed at the same time the instrument enters logging mode. Once the instrument is in its respective mode, the select key is used to step through the different functions.
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. Pressing the report key while in logging mode will send all data in memory from the currently displayed record forward to the RS-232 port.
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 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.
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.
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.
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.
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.
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.
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.
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).
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).
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.
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.
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.
Press select a twelfth time and the unit will return to normal display mode.
See the calibration reference section on page 20 for other details.
Press select and scale at the same time, and the unit enters the calibration mode, first displaying the Solar radiation calibration factor. If necessary, press the maximum or minimum key to enter the proper factor. This factor is located on the back of the instrument.
Press select a second time and the unit displays the indoor temperature. Press the maximum or minimum key to enter the actual temperature.
Press select a third time – the unit displays the outdoor temperature. Press
the maximum or minimum key to enter the actual temperature.
Press select a fourth time, and the unit displays barometric pressure. Press
the maximum or minimum key to enter the actual barometric pressure.
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).
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
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.
Press select and time hold at the same time to enter logging mode (note
that all the trend indicators are on when in this mode).
Logging mode allows the user to view previously logged data via the display.
(You can only enter logging mode if there is data in the logging memory).
You may choose at what interval of time you would like the data saved through the print set routine (see page 12). Once in logging mode press the minimum and maximum key to move forward and backward through the data. The date and time of the line of date will be displayed in the time/date window. If you have a printer connected to the display, pressing the report key from within the logging mode, directs the WRL to output data from the data displayed point forward. Press select again to exit logging mode. The WRL will start writing over the oldest data records in memory with new data , when the capacity of the memory is achieved.
The TWI_LOG program supplied with this unit is a PC based software program that allows the user to access many features of the WRL that are not possible from the display. Please see the TWI_LOG (page 14) section in this manual for information.
There are two settings that will affect the deposition of data. The first, report
interval , determines how often the WRL will automatically dump data to the
RS-232 port. The second, log interval, determines how often the unit saves
data to its internal memory.
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
Pressing select a second time displays the number of minutes between
lines of information. Press the maximum and minimum keys to change the
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:
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 in the reference section called control options for more information)
Press select a eighth time and the unit will return to a normal display.
Communicating with the WRL
The WRL via its RS-232 interface can communicate with computers running
either the TWI-LOG program or standard computer communication programs. The WRL responds to the following ASCII characters sent by computers, with ASCII space delimited text.
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.
IN 07/24/90 SW 00MPH 000K 067F 067F 054% 30.00″ 00.19″D 01.38″M 00.00″RMAX 07/24/90 SSE 25MPH 052K 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. (Note: use of
the either c command will clear the logged min/max.)
MIN 07/24/90 SW 00MPH 000K 067F 067F 054% 30.00″ 00.19″D 01.38″M 00.00″T MAX 07/24/90 SSE 25MPH 052K 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.
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.
TA 10:33 038K TA 09:32 056 K
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
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)
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.)
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.
The following commands respond if the WRL has logged data in memory.
T- Data logger top, moves pointer to the top of the data records, then
N- Data logger next, moves pointer to the next data record, then sends
A- Data logger again, sends same data again.
P- Data logger previous, moves pointer to the previous data record, then
B- Data logger bottom, moves pointer to the bottom of the data records.
01/01 23:00 052K 053F 085F 000% 29.92″ 00.00″D 000MPH NNE
date time temp humidity bp rain wind speed direction
Included with the WRL is the TWI_LOG program. TWI_LOG is an IBM PC
software program which enables the user 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.
• The first screen of the program will look this:
Texas Weather Instruments, Inc. 16 WRL Solar Instruction Manual
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
Modem COM1:2400,N,8,1,BIN,DS0,CD0,CS0 ATE0Q0V1M1X4S0=0 DT1,214,234-1309
• 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 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.
Pressing F5 -the calibration screen.
Inx Value Description Inx Value Description
|1||5.76 uamps/Klux cal||19||94 Clock years|
|2||0 temp:inside||20||11 clock month|
|3||73 temp:outside||21||22 clock day of month|
|4||29.92 barometric pressure||22||2 clock day of week::Mon:|
|5||o elevation||23||11 clock hours|
|6||0.750 MVP @ 0.0% HR||24||24 clock minutes|
|7||3.255 MVP @ 73.3% HR||25||54 clock seconds|
|8||8 wind dir. offset||26||0 log interval hrs|
|9||2 rain inc flag||27||30 log interval minutes|
|10||0.01 rain inc value||28||0 Scale: 0=FPS 1=CGS|
|11||0.00 rain fall: daily||29||0 ID number|
|12||0.00 rain fall: monthly||30||8 POR Counter|
|13||0.00 rain fall: term||31||0 COP Counter|
|14||0 report interval Hs||32||0 Wsp units :MPH|
|15||0 report interval min||33||1 Time display :AMPM|
|16||0 report flag||34||1 aux Temp|
|17||4 report end of day||35||1 Wsp/Wdir|
|18||4 baud rate|
enter parameter index: ?
Note: This screen can 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) Solar radiation calibration factor
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)
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 hours, sets the automatic data dump interval to
15) Report output interval minutes, sets the automatic data dump interval to
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
18) 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 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.)
19) Sets the year in the internal clock.
20) Sets the month.
21) Sets day of month.
22) Sets the day of the week. (1=Sunday, 2=Monday, 3= Tuesday, 4=Wednesday, 5=Thursday, 6= Friday, 7=Sunday)
23) Sets hours in 24 hour format.
24) Sets minutes
25) Sets Seconds.
26) Sets the logging interval hours (saves data in the units memory when set)
27) Sets the logging interval minutes.
28) 0 for English or 1 for Metric scale
29) Sets the ID number (0 through 255)
30) Displays number of power ups (0 through 255)
31) Displays number of COP resets (o through 255). Cop is a processor routine that will reboot the unit if it detects an error.
32) 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.
33) 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.
34) 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.
35) 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.
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
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
throught the 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 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 thetable 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. 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 intothe weather instrument via the print set function.
Knots on 16
AM PM on 32
Aux disable on 64
Instant wind speed on 128
You may also change these functions via the software program TWI_LOG
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
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 . . .
A modem may be used with the WRL 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 WRL 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. (Modems pre-programmed in non-volatile memory are available from Texas Weather Instruments.)
The WRL with a null modem adapter, 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 IBMPC) or the TWI_LOG program. The WRL sends data in a serial format at 300 to 19.2 baud rate, 8 data bits, no parity and one stop bit.
Note: The WRL 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.
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.
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.
If for some reason you suspect that the temperature is not calibrated properly, use a quality bulb thermometer with which to calibrate. Remember, the WRL will be most accurate near the temperature at which it was calibrated.
The cal number for this sensor is found on the end of the solar sensor plug or etched on the sensor tube.
Humidity Sensor Calibration
The humidity sensor is calibrated by inputting two voltages found on humidity sensor into the WRL. 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 inside 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.
The WRL is compatible with most rain collectors on the market today. The rain inc flag is only utilized to tell the WRL 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 WRL to react with one count for every momentary switch closure of the rain collector.
Setting 3 tells the WRL to react with one count for every rain collector switch transition from an open or closed state. Rain inc value tells the WRL 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
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.
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)
Setting Min/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
Texas Weather Instruments, Inc. 24 WRL Solar Instruction Manual
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
Special Key Functions
Select + Report = Time Set Function
Select + Scale = Calibration Set Function
Select + Average = Printer Set Function
Select + Humidity Hold = Humidity Calibration Set
Select + Time Hold = Logging mode
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
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
Texas Weather Instruments, Inc. 25 WRL Solar Instruction Manual 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.
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
• Increase the separation between the equipment and the affected
• Connect the equipment and the affected receiver to power outlets on
• Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved by Texas Weather
Instruments, Inc. could void the user’s authority to operate the equipment.
Shielded cables must be used with this equipment to maintain compliance
with FCC regulations.
Texas Weather Instruments, Inc. 28 WRL Solar Instruction Manual
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
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 Figure2).
Try unplugging then replugging the transformer to reset the computer.
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 (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 (214) 340-4293 and ask for
Technical Support, we will be happy to help you.