Campbell 012, Operator'S Manual

Page: 19 / 34

SECTION 2. WEATHER STATION INSTALLATION
2-9
2.6 DATA RETRIEVAL OPTION
INSTALLATION
The four options available for data collection are
the Rad Modem, DC112 Phone Modem, RF95
Radio Frequency modem, and storage modules.
Any modem ordered with the station is pre-
mounted in the canister. Refer to the specific
manuals of each device for technical information
on the modems and storage modules.
2.6.1 RAD MODEMS
Figure 2.6-1 shows the RAD modem terminal
block located inside the pedestal base. The
communication cable is connected between the
modem at the PC and the weather station
according to the labels shown in Table 2.6. The
communications cable connecting the station to
the computer must be two twisted pairs (4
conductors) and suitable for burial. Examples
are *Anixter part number F-02P22BPN (Rodent
Proof) or *Belden part number 1048A.
TABLE 2.6. Rad Modem Connections
SRM-6A at PC Base of Weather Station
+XMT +XMT
-XMT -XMT
+RCV +RCV
-RCV -RCV
*Anixter *Belden
4711 601 FRD P.O. Box 1980
Skokie, IL 60076 Richmond, IN 47375
708-677-2600 1-800-BELDEN1
2.6.2 DC112 PHONE MODEM
Figure 2.6-2 shows the phone modem terminal block
located inside the pedestal base. A copper shielded,
burial phone cable should enter the weather station
pedestal via the conduit. Strip 1 7/8 inches of the
insulation off the cable without cutting the copper
shield. Strip the shield 1 1/2", insert the cable into
the ground lug mounted on the center terminal, and
tighten it onto the copper shield.
CAUTION: Do not over tighten ground lug
or damage to the phone line will occur.
Connect the RING signal (orange or blue wires)
to the terminal labeled RING and the TIP signal
(white/orange or white/blue wires) to the
terminal labeled TIP.
2.6.3 RF MODEM
Mount the antenna to the mast of the weather
station as shown in Figure 2.6-3. Fish the
connecting COAX cable through the grommeted
hole in the bottom of the cross arm adjacent at
the mast. Connect the cable to the antenna.
Take care not to kink the COAX cable or
damage will occur.
The RF95 Modem must be removed from the
canister to set the station ID number if the
switches have not been preset. Directions for
setting the ID switches are described in the
Radiotelemetry Network Applications Manual.
2.6.4 STORAGE MODULE SM192/SM716
The CR10 is programmed to automatically
transfer data when it detects that a storage
module is connected. The storage module is
brought to the site and connected to the CR10
as shown in Figure 2.6-4. Data transfer begins
within 5 seconds after making connections, and
ends a maximum of 55 seconds later. If an
SC90 Line Monitor is used, an LED turns on
and off when data transfer starts and stops,
respectively. Disconnect the storage module
and proceed to the office for data playback.
Never leave the storage module connected
to the weather station.