Rain Bird WS-PRO, Installation, Maintenance And Troubleshooting Manual

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Page
54
CHECKING THE
COMMUNICATIONS
WIRE PATH:
Before initially connecting a direct
connect or phone line weather station,
or when troubleshooting the weather
station and the communication wiring is
suspect, check the communication wires
for their integrity.
LOOP RESISTANCE
Connect the pair of wires, you will be
checking, together at the far end.
Using a volt/ohm meter, measure across
the wire loop. A
“GOOD” wire path
has less than 600 OHMS resistance
across the loop.
GROUND RESISTANCE
Disconnect the communication wires at
the MSP-1 pipe surge arrestor, located
at the Weather Station. Using a
volt/ohm meter, set the dial to
R x 1K
and measure from each wire to earth
ground. A
“GOOD” wire path has a
high resistance to earth ground, of at
least
750,000 OHMS or greater.
A “WS-PRO-SH” DIRECT
CONNECT WEATHER STATION
Weather Station will not answer.
Test the wire path using a known
“Good” RAD SRM-5A Short Haul
Modem.
First: Check that the RAD Short Haul
Modem, at the central computer
location, is working correctly.
This can be easily done by using
the following method.
•
Jumper the output terminals of the
RAD SRM-5A Short Haul Modem,
located at the computer, as shown in
FIGURE 26 below.
•
Using a working (“Good”) RAD
SRM-5A Short Haul Modem connect
the communication wires together at
the weather station end as shown in
FIGURE 26 below.
•
With the Rain Bird Weather
Software, go to the Main Menu and
set the “capital lock” on the
keyboard of the computer.
•
Be sure to configure a direct connect
weather station.
•
Press a capital [ W ] from the Main
Menu screen.
•
If a security number is asked for use
[
6275 ].
•
Choose a direct connect station and
the screen will go “BLANK”.
•
Assuming you have connected the
output terminals of the modem as
shown in FIGURE 25 below, what
you type will be echoed back to the
computer screen. Testing the short
haul modem in this way will verify
that it is working properly. If you
do not see the characters, that you