T107 Weather Station
2. Connect the modem 9-pin port to the ET Enclosure CS I/O port with the
pn 10588 ribbon cable supplied with the ET Enclosure (see FIGURE 2-23
and FIGURE 2-24).
3. Connect the modem RJ-11 jack to the ET Enclosure RJ-11 jack with the
RJ-11 patch cord (see FIGURE 2-24).
4. Connect the modem ground terminal block (GND) to the ET Enclosure
ground with the 14 AWG ground wire.
2.5.2.2 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 connector marked COM on the external
back panel, under the protective cover.
It’s very important that each plug is completely seated on to the
connector and the locking ring turned 1/4 revolution clockwise.
Failure to seat the plug completely could cause corrosion and
water damage to both the enclosure and the sensor cable.
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.
The splice and wire nut must be completely immersed into the
silicon gel inside the splice tube to be waterproof.
2.5.3 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
maximum cable length is 6.0 miles using 19 AWG cable. DCE / DTE switches
on the modems are set to DCE.
It’s critical to use at least a two twisted-pair cable with a shield
wire. Shield wire(s) and/or any additional unused conductors must
connect to an earth ground at one end or the other of the cable run.
NOTE
NOTE
NOTE
33
Summary of Contents for T107
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Page 78: ...T107 Weather Station 70...
Page 93: ...Appendix C Exploded Views C 1 Enclosure C 1...
Page 94: ...Appendix C Exploded Views C 2 Crossarm C 2...
Page 102: ...Appendix D Default Programs D 8...
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