Texas Instruments Weather Radio WRL 10 User Manual

WRL  
Weather Report Logger  
The WRL senses wind, temperature, humidity, barometric pressure, rainfall and time, then  
outputs this data via a RS-232 interface to other devices. The WRL can be programmed  
to output current weather, along with minimum and maximum conditions for the day. The  
WRL keeps track of two different minimum and maximum values and up to 8000 lines of  
data (depending on memory size) in its non-volatile memory clock. The WRL-10 has 2K of  
memory and will retain approximately 30 lines of data. The WRL-32 has 32K of memory  
and will retain approxomately 2000 lines of data. The WRL-128 has 128K of memory and  
retains about 8000 lines of data. All functions of the WRL can be controlled through its RS-  
232 interface.  
Included with the standard WRL system is a wind direction and speed sensor, a pagoda  
mounted temperature/humidity sensor, a rain collector and a pressure sensor installed in  
the display console. Options include solar radiation, lightning and leaf wettness sensors.  
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  
temperature. In addition, if selected, the optional solar radiation or aux temperature is  
displayed when both the indoor and outdoor indicator lights are extinguished. The unit also  
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. During wind speeds in excess of 99  
miles per hour a small light turns 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 is increasing  
then the up trend arrow appears on. If there is no change in humidity, then the arrow would  
not appear.  
Installation  
The standard WRL uses three sensors to gather weather data. The wind direction and  
speed sensor, the temperature and humidity pagoda 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 two 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 into any blue RJ45 connector, the order does not matter.  
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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)and remove the front cover of the junction box. Next insert the  
connectors from the sensors and the cables from the console through the hole in the bottom  
of the junction box and then out the front of the box. Plug all the yellow connectors into the  
yellow RJ45 connectors and all the blue connectors into the blue RJ-45 connectors and  
then pull the excess cable out of the junction box (j-box). 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). Next, plug in the serial  
cable into the connector 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 either you have a null  
modem adapter attached to the cable or that the cable is a null modem cable. The cable  
supplied with the WRL will have four connectors or will be marked with a green  
color on one of the cable connectors. Plug the wall transformer into a 120V wall socket  
to power up the unit.  
The optional solar sensor must be pointed to the South and must be free of shadows  
created by the other sensors (Near the top of the mast is normally 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 in the j-  
box. Run the red intermediate cable to the console and plug it into the j-box.  
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OPERATION  
Report  
Hold  
Date/Time  
Windchill  
Temperature  
Hold  
Comfort  
Hold  
Last  
Hold  
Barometer/Humidity  
Rainfall  
Average  
Scale  
Select Clear Min Max  
Weather Report  
FUNCTION KEYS  
Select  
The select key, when depressed at exactly 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  
depressed at exactly 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 depressed at exactly the same time the instrument enters  
rainfall history set. When select and time hold are pressed at exactly the same time the  
instrument enters logging mode. When the select key is held for 10 seconds, the unit will  
enter or exit protect mode. Once the instrument is in its respective mode, the select key is  
used to step through the different functions. If the unit is in protect mode, all of these  
functions are disabled  
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  
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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. If the  
unit is in protect mode, this function is disabled.  
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 that 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 depressed, displays the time and date of the last rainfall and its rainfall  
rate. When depressed at the same time as the clear key, the instrument clears the term  
rainfall register. When last is 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), indicates 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 depressing the average  
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 and the minimum button to  
retard the year. If the unit is in protect mode this function is disabled.  
.
Report  
Time/Date  
Hold  
Windchill  
Temperature  
90  
Hold  
Comfort  
Barometer/Humidity  
Rainfall  
Hold  
Last  
Hold  
Select  
Clear Minimum Maximum Scale  
WEATHER REPORT  
Press select a again and the month will be displayed (i.e., 1 = Jan. and 12 = Dec.). Press  
the maximum and minimum key to set the month.  
Report  
AM  
12 - -  
PM  
Hold  
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  
AM  
PM  
- -.25  
Hold  
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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  
AM  
04  
PM  
Hold  
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  
AM  
23:- -  
PM  
Hold  
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  
AM  
- -.42  
PM  
Hold  
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  
AM  
22  
PM  
Hold  
Press select an eighth time (Note: 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).  
Report  
AM  
12.- -  
PM  
Hold  
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Press select a ninth time (Note: 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  
AM  
- -.51  
PM  
Hold  
Press select a tenth time (Note: 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  
AM  
09'- -  
PM  
Hold  
Press select an eleventh time (Note: 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  
AM  
- -'31  
PM  
Hold  
Press select a twelfth time and the unit will return to normal display mode.  
Calibration mode  
See the calibration reference section for other details.  
Calibration Method  
Press select and scale at the same time, and the unit enters calibration mode. The unit first  
displays 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. When the unit is in protect mode, this function is disabled.  
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Report  
Hold  
Time/Date  
Windchill  
Hold  
76  
Temperature  
Comfort  
Hold  
Barometer/Humidity  
Rainfall  
Last  
Hold  
Select  
Clear Minimum Maximum Scale  
WEATHER REPORT  
Press select a second time; the unit displays the indoor temperature. Press the maximum  
or minimum key to enter the actual temperature.  
Windchill  
Indoor  
Outdoor  
- -.73  
Hold  
Press select a third time - the unit displays the outdoor temperature. Press the maximum  
or minimum key to enter the actual temperature.  
Windchill  
Indoor  
Outdoor  
- -.28  
Hold  
Press select a fourth time; the unit displays barometric pressure. Press the maximum or  
minimum key to enter the actual barometric pressure.  
Comfort  
29.92  
Hold  
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Press select a fifth time; the unit displays 0, 1, 2, or 3 in the rainfall window. 2 is the normal  
display. Press the maximum or minimum key to enter the proper number (see calibration  
reference for more information).  
Last  
Daily  
Monthly  
IInch  
Term  
2
Hold  
Press select a sixth time; the unit will display a reading ranging from .01 to .1 in the rainfall  
window. Press the maximum or minimum button to enter the proper number which is  
usually .01.  
Last  
Daily  
Monthly  
IInch  
Term  
.01  
Hold  
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. If the unit is in protect mode this function is disabled.  
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Logging Mode  
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).  
Report  
Time/Date  
Hold  
Windchill  
Hold  
10:23  
76  
Temperature  
Comfort  
.
29.92  
Hold  
Barometer/Humidity  
Rainfall  
Last  
Hold  
2.35  
Select  
Clear Minimum Maximum Scale  
WEATHER REPORT  
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 what  
interval of time you would like the data saved through the print set routine. Once in logging  
mode, press the minimum or maximum key to move forward or 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 the select  
button 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.  
Print Set Mode  
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  
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second, log interval, determines how often the unit saves data to its internal memory. If the  
unit is in protect mode this function is disabled.  
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
1
2
3
4
5
6
7
OFF  
ON  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
OFF  
ON  
OFF  
OFF  
OFF  
ON  
OFF  
OFF  
OFF  
OFF  
ON  
ON  
ON  
ON  
OFF  
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 which 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 appears in the  
pressure/humidity window. This number represents output options. Enter the proper  
option number by pressing the maximum or the minimum key. 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.  
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Protect Mode  
When the unit is in protect mode, scale, time setting, calibration and print set modes are  
disabled. To enter or exit protect mode, press the select key for more than 10 seconds.  
The WRL will display PPPP in the time and date window when the select key is depressed  
while in protect mode.  
Daylight Savings Mode  
When enabled through the print set routine, the unit will automatically adjust the time to  
correspond with daylight savings time. When daylight savings mode is enabled, two  
decimal points will be displayed in the time/date window when the select key is pressed.  
Operation via RS-232  
The WRL via its RS-232 interface can communicate with computers running either the  
TWICAL program, standard computer communication programs like Windows Hyperterm  
or dedicated weather applications like WeatherView32. The WRL 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 000F 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. (Note: use of the either c command will clear  
the logged min/max.)  
Sample  
MIN 07/24/90 SW 00MPH 000F 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.  
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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 term 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  
TI 04:15 075F  
TO 10:33 038F  
RH 15:44 033%  
BP 16:11 29.57”  
TA 09:32 056 F  
TI 15:03 080 F  
TO 16:10 056 F  
RH 01:40 060 %  
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). C is  
cleared every midnight. M is only cleared by pressing the clear and min buttons on the  
display or sending an upper case M via a computer.  
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.  
Q- Unit response with hi resolution time, wind, temperature and pressure (in hi-res  
models only).  
Sample  
96/01/15 09:21:44 SSE 004.3MPH 052.6F 069.2F 078.5F 069% 30.041F 002.19"  
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 sends data  
N- Data logger next, moves pointer to the next data record, then sends data.  
A- Data logger again, sends same data again.  
P- Data logger previous, moves pointer to the previous data record, then sends  
data.  
B- Data logger bottom, moves pointer to the bottom of the data records.  
Sample  
96/03/07 23:00 056.2F 053.2F 085.8F 070% 29.926I" 00.00"ID 007.5MPH 342D  
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date  
time  
temp  
humidity bp rain wind speed direction  
Note: if you have the optional solar sensor, all aux temperature data will be replaced  
with solar data followed by the letter K.  
Reference  
Control Options  
Control options can be changed via the console using the print set routine (see print set  
mode). These control options can also be changed using TWICAL software, which is  
enabled this option will make the weather station automatically change the weather station  
time in keeping with daylight savings time as recognize in the United States. The second  
control option is wind speed scale. When turned on, the wind speed is in knots instead of  
the normal mile per hour or kilometer per hour when in metric scale. The third control  
option selects the manner in which the time is displayed. 24-hour military style or the AM  
PM format. When enabled, the AM PM style is displayed. Aux display disable is the fourth  
option, when it is on the temperature display cycles between the indoor and outdoor values  
only. If you do not have options such as aux temperature or solar radiation aux display  
disable should be turned on. Instant wind speed output is the fifth option. When turned on  
the windspeed output to the RS-232 port is an instant reading rather than a one-minute  
average.  
To turn on the desired control options via the weather station display, refer to the table  
below, add up the values of the controls that should be turned on and enter that value into  
the weather instrument via the print set function (see page 12). The default value is 224.  
For example if you wanted AM PM turned on and instant wind speed output turned on you  
would add 32+128 which equals 192. Enter 192 into the weather instrument via the print  
set function.  
Option  
Daylight savings mode on  
Knots on  
Value  
8
16  
AM PM on  
32  
Aux disable on  
Instant wind speed on  
total  
64  
128  
You may also change these functions via the software program TWICAL.  
RS-232 Interface  
The pin out on the RS-232 interface is as follows:  
.DE 9 Plug  
Header  
Pin 1 . . .  
Pin 3 . . .  
Pin 1  
Pin 2  
Receive Data  
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Pin 3  
Pin 4  
Pin 5  
Pin 6  
Pin 7  
Pin 8  
Pin 9  
Pin 5 . . .  
Pin 7 . . . .  
Pin 9 . . .  
Pin 2 . . .  
Pin 4 . . .  
Pin 6 . . .  
Pin 8 . . .  
Transmit Data  
Data Set Ready  
Signal Ground  
Data Terminal Ready (must be true to send data)  
Clear to Send  
Request Send  
To communicate with a computer a null modem adapter or cable must be used.  
Modem Installation  
A modem may be used with the WRL for remote operations. A modem adapter 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.)  
Typical Output  
Temperature  
Aux Indoor Outdoor Humidity  
Daily  
Rain  
Monthly Rainfall  
Rain Rate  
Time  
Date  
Direction Speed  
Pressure  
15:00 07/24/90 127 03MPH 070F 069F 082F 090% 30.04" 00.01"D 01.20"M 00.00"R  
15:15 07/24/90 130 04MPH 052F 069F 078F 099% 30.04" 00.19"D 01.38"M 00.72"R  
15:30 07/24/90 122 02MPH 065F 068F 072F 089% 30.04" 00.19"D 01.38"M 00.00"R  
MIN 07/24/90 123 00MPH 070F 067F 067F 054% 30.00" 00.19"D 01.38"M 00.00"R  
MAX 07/24/90 135 25MPH 052F 071F 092F 099% 30.06" 00.19"D 01.38"M 00.72"R  
Computer Interface  
The WRL with the proper cable, may be plugged directly into computers equipped with RS-  
232 interfaces. Data may be captured using a communication program like hyperterminal  
or the TWICAL 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.  
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Calibration  
The Weather Report comes pre-calibrated from the factory, but it is possible to  
recalibrate most of the primary functions of the instrument using TWICAL 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 the temperature. Remember that the WRL will be  
most accurate near the temperature at which it was calibrated.  
Humidity Sensor Calibration  
The humidity sensor is calibrated by inputting two voltages found on the humidity sensor  
into the WRL. Humidity calibration factors can be entered by depressing select and  
humdity hold at exacty the same time. 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.  
Rainfall  
The WRL is compatible with most rain collectors on the market today. 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.  
The rain measurement value tells the WRL how much rainfall to display for each count.  
THE PROPER SETTING FOR THE TEXAS WEATHER INSTRUMENTS RAIN  
COLLECTOR IS "2" FOR THE COUNT AND ".01" FOR THE MEASUREMENT.  
Texas Weather Instruments, Inc.  
17  
WRL Instruction Manual  
 
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 calibration routine.  
Report Flag  
The report flag selects the format of the RS-232 output and may be changed via the the  
print set mode or the TWICAL program calibration  
SETTING MIN/MAX  
FORM FEED  
OFF  
RAIN RATE  
0
1
2
3
4
5
6
7
OFF  
ON  
OFF  
ON  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
OFF  
OFF  
ON  
ON  
ON  
ON  
OFF  
OFF  
ON  
OFF  
OFF  
OFF  
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.  
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. If you have the optional lighting sensor the lunar tide  
display does not function as it is replaced with lightning data.  
Clearing the Memories  
Texas Weather Instruments, Inc.  
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WRL Instruction Manual  
 
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 TWICAL.  
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.  
Texas Weather Instruments, Inc.  
19  
WRL Instruction Manual  
 
-
+
Texas Weather Instruments, Inc.  
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WRL 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, this equiment 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 RS-232 cables must be used with this equipment to maintain compliance with  
FCC regulations.  
Texas Weather Instruments, Inc.  
21  
WRL Instruction Manual  
 
lunar/tide cycle, 4  
A
M
ASCII characters, 13  
AT control signals, 16  
Average, 5  
Maximum, 5  
Minimum, 4  
Modem Installation, 16  
B
C
N
O
P
Barometric Pressure, 17  
Normal Operation, 1  
null modem adapter, 3  
Calibration, 17  
Calibration Method, 8  
Calibration mode, 8  
Clear, 4  
Operation, 13  
OPERATION, 4  
Clearing the Memories, 19  
Comfort, 5  
Command Characters, 13  
Computer Interface, 16  
Control Options, 15  
pagoda, 1, 2  
Print Set, 11  
Protect Mode, 13  
D
R
daylight savings mode, 15  
Daylight Savings Mode, 13  
Rainfall, 17  
Rainfall history mode, 19  
Reference, 15  
F
Report, 5  
FUNCTION KEYS, 4  
Report Flag, 18  
RS-232, 5, 11, 13, 15  
H
S
Hold, 5  
Humidity Sensor Calibration, 10, 17  
Scale, 5  
Select, 4  
I
T
Installation, 1  
Temperature, 17  
tide clock, 18  
Time Setting Mode, 6  
Trend indicators, 1  
Typical Output, 16  
J
junction box, 1, 2, 3  
L
W
Last, 5  
Logging Mode, 11  
lunar tide cycle, 18  
Lunar Tide Cycle, 18  
Windchill, 5, 14  
Texas Weather Instruments, Inc.  
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WRL Instruction Manual  
 

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