WR-25 Instruction Manual
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. (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 |
15:15 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-232interfaces. 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.
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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
Texas Weather Instruments, Inc. | WR-25 Instruction Manual |
