ET107 Weather Station
33
4.
Connect the modem ground terminal block (GND) to the enclosure ground
by using the 14 AWG ground wire.
5.6.2.2 External Installation of Phone Modem
The following modem kit components are used to make the external
connections:
(1) Direct Burial Splice Kit
(1) 20 ft Telephone Patch Cord with Connector
1.
Connect the 20-foot patch cord to the
COM
connector on the external
back panel, under the protective cover. Ensure that the plug is completely
seated.
2.
Splice the
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
silicone gel inside the splice tube to be waterproof.
5.6.3 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 gage. At 9600 bps, 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.
5.6.3.1 Internal Installation of Short Haul Modem
If the short haul modem was ordered with the ET107, skip this
section and go directly to Section
(p. 35)
For installing inside the ET107 enclosure, the following components are
provided in the short-haul modem kit:
(1) SC932C 9-pin to RS-232 DCE Interface
(1) Rad Modem
(1) Rad/SC932C Mounting Bracket
(1) 12 inch 4-wire patch cable
Use the following procedure to install the short-haul modems (FIGURE
and FIGURE
).
NOTE
CAUTION
NOTE
