Texas Weather Instruments, Inc.
21
WR-25 Instruction Manual
(Modems pre-programmed in non-volatile memory are available from Texas
Weather Instruments.)
Typical Output
Temperature
Daily Monthly Rainfall
Time Date Direction Speed Aux Indoor Outdoor Humidity Pressure Rain Rain Rate
15:00 07/24/90 SE 03MPH 070F 069F 082F 090% 30.04S 00.01"D 01.20"M 00.00"R
15:15 07/24/90 SSE 04MPH 052F 069F 078F 099% 30.04S 00.19"D 01.38"M 00.72"R
15:30 07/24/90 SE 02MPH 065F 068F 072F 089% 30.04S 00.19"D 01.38"M 00.00"R
MIN 07/24/90 SW 00MPH 070F 067F 067F 054% 30.00" 00.19"D 01.38"M 00.00"R
MAX 07/24/90 SSE 25MPH 052F 071F 092F 099% 30.06" 00.19"D 01.38"M 00.72"R
Computer Interface
The WR-25 may be plugged directly into computers equipped with RS-232
interfaces. Data may be captured to disk by using a communication program
(i.e., Crosstalk or Procomm for the IBM-PC) or the TWI_LOG program. The
WR-25 sends data in a serial format at 300 to 19.2 baud rate, 8 data bits, no
parity and one stop bit.
Note: The WR-25 has two separate minimum and maximum memories.
Clearing the M command minimum and maximum memory will not affect the
C command minimum and maximum memory and vice-versa. The
printer/computer memories clear at 12:00 midnight every day and/or when
the
c
key is pressed on the computer console.
Calibration Reference
The Weather Report comes pre-calibrated from the factory, but it is possible to
recalibrate most of the primary functions of the instrument using the
F5
function
of the TWI_LOG program.
Barometric Pressure
Normally, barometric pressure is the only item that needs to be recalibrated
(adjusting for altitude). The proper local barometric pressure can be obtained
from the local news. Set the barometric pressure reading you obtained from the
local media by using the calibration mode function.
Temperature
If for some reason you suspect that the temperature is not calibrated properly,
use a quality bulb thermometer with which to calibrate. Remember, the WR-25
will be most accurate near the temperature at which it was calibrated.
