Texas Instruments WRL-10 instruction manual Modem Installation, Typical Output, Computer Interface

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 . . .

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		Daily	Monthly	Rainfall
Time	Date	Direction Speed	Aux Indoor Outdoor Humidity	Pressure	Rain	Rain	Rate

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.

Texas Weather Instruments, Inc. 16 WRL Instruction Manual