Weather Station - Model “PRO”
Model “PRO” - Weather Station
Page
57
Nov., 2001
GT27145B Cozz
A “WS-PRO-PH” PHONE
CONNECT WEATHER STATION
Weather Station will not answer.
• Check the weather station for
operation on it’s own to be sure it is
functioning properly. This will
verify the proper voltage coming into
the weather station and also if the
datalogger checks out O.K.
• Connect a telephone to the phone
line at the weather station and call
out, or have someone call in. Listen
for any noise on the line. Refer to
NOTE below.
NOTE ! A phone line going to the
computer or to the weather station itself
MUST BE DATA QUALITY. You can
talk over a phone line that will NOT
allow data communication.. Listen for
any fuzzy noises and any disturbance at
all. You must be sure the phone line is
“Good”. Time and time again we have
set up stations and the phone line is NOT
good enough for communication. Make
sure the phone company knows this will
be for data communication. Have
Phone Company check line ALL the way
back to the weather station.
• If the station is still not answering,
get your volt/ohm meter and measure
across the phone line. It should read
approximately 48 Volts DC, with
the Ring as the positive side and the
Tip the negative side.
• Have someone call in and then
measure the voltage across the phone
line. It should read 90 to 110 Volts
AC. The answer modem switch
circuit requires 40 Volts to activate
and allow the signal to pass to the
datalogger.
• The Datalogger detects the ring and
raises the modem enable line high
(pin 5), to +5 Volts DC. (Measure
pin 5 to ground).
CAUTION ! Connect a volt/ohm meter
to the phone line only in extreme cases.
It is recommended to use FCC approved
equipment only - while measuring
current on a telephone line.
USE NO MSP-1, pipe surge arrestor
on the telephone communication wires.
If an MSP-1 pipe surge arrestor is used
in the line, the Weather Station will
usually answer and then hang up right
away. The MSP-1 is for low voltage
applications and the telephone line is
excited to well over the 50 volt limit of
the MSP-1 surge arrestor so will shunt
the line to earth ground.
• Test the phone modem, at the
weather station by dialing out to the
weather station. It is working and is
O.K. if you can hear a dial tone and
the dialing. This also verifies the
communication path and most
modem settings.
• If telephone line appears to be O.K. -
then change the phone modem at the
weather station, to a known “Good”
phone modem and try again.
• If the station still does not answer,
then have the telephone company
check the phone line again, even if
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