Section 3. T.Weather 106 Instrumentation Installation
3-7
4.
Connect the modem ground port to the T.Weather 106 Enclosure ground
with the 14 AWG ground wire.
3.3.1.2 External Installation
The following modem kit components are used to make the external
connections:
(1) Direct Burial Splice Kit
(1) 20 foot Telephone Patch Cord with Connector
1)
Connect the 20 foot patch cord to the connector marked "comm" on the
external back panel, under the protective cover.
2)
Splice the labeled "Tip" and "Ring" lines of the patch cord to the telephone
service line. Use the direct burial splice kit when splices are in a valve
box or buried.
3.3.2 Short-Haul Modem
Short-haul modems enable communication between a datalogger and computer
over two twisted pairs of wires. The maximum distance between modems is
determined by baud rate and wire gauge. At 9600 baud, the approximate range
is 4.0 miles. DCE / DTE switches on the modems are set to DCE.
C
A
M
PB
EL
L
SC
IE
N
TI
FI
C
L
TD
SC
93
2
- S
/N
E
10
55
QC
FIGURE 3.3-2. Short-Haul Modem Mounting and Connection
3.3.2.1 Internal Installation
For installation inside the T.Weather 106 Enclosure, the following components
are provided in the short-haul modem kit:
(1) SC932C Interface
(1) Rad Modem
(1) Rad/SC932C Mounting Bracket
(4) Screws
(1) 12 inch 4-wire patch cable
Install the short-haul modems as shown in Figure 3.3-2 and 3.3-3.
