FTS LT1-CELL-VZ, Руководство оператора

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700- LT1-Man Rev 8 09 Feb 2021 Page 26/60
IMPORTANT! FTS recommends that you consult a qualified professional to ensure
adequate earth ground protection is installed for the site and to ensure all local
regulations and requirements are met.
•
Set up the earth-ground system (typically a copper or copper sheathed grounding rod driven
into the ground) and run the grounding wire from the system to the enclosure’s grounding
lug.
4.6 CONNECTING CELLULAR TELEMETRY
The LT1-Cell has a dual GPS and cellular antenna each with individual SMA connectors. Mount the
dual antenna in the desired position. If mounted inside an enclosure, ensure the materials will not
interfere with the GPS’ signal. The FTS enclosure has a built-in antenna mount. Attach the antenna
leads to their respective connectors.
4.7 CONNECTING SATELLITE TELEMETRY
Note that the LT1 only accepts SMA connectors for telemetry and GPS connections; therefore, an
SMA to N adapter has been provided for connecting GOES antennas. Mount the satellite and GPS
antennas in their desired locations and connect to their respective connectors on the LT1.
4.8 CONNECTING SENSORS
Sensors are connected via the 8-pin data terminal block. The LT1 can accommodate one FT7 RS485
or one NMEA device, two SDI-12 sensors (four if a V2), and a rain gauge. If two or more SDI-12
sensors are being connected, they must have their wires spliced and use the same pins designated
for SDI-12 sensors. Additionally, if more than two devices are being connected, a ground terminal
will have to be shared. Use the following pin layout as a reference.
NOTES:
• Only FT Tech FT7 RS-485 sensors are compatible with the LT1
• The Signal Ground (G) or Power Ground (GD) pins are not specific to any type
of sensor: either can be used for any sensor’s ground wire.
B FT Tech RS485/NMEA negative
A FT TechRS485/NMEA positive
G Signal ground
SD SDI-12 data
SP SDI-12 power out
GD Power ground
RN
Discrete counter in
(Rain Gauge)
P RS485/NMEA power out
Figure 3-2: Data Terminal Block