700- LT1-SYS-IG Rev 2 22 Oct 2018
Page 9/22
CONNECTING SDI-12 SENSORS
Connect the SDI-12 power wire (+) to the
SP
pin, the SDI-12 data wire to the
SD
pin, and the ground wire to either the
GD
or the
G
pin.
CONNECTING A TIPPING BUCKET (RAIN GAUGE)
Connect the signal input wire to the
RN
pin, and the ground wire to either the
GD
or the
G
pin.
FT742 RS-485 WIND SENSOR HEATER OPTION
If using the heater option on an attached FT742 RS-485 wind sensor a power
source capable of at least 3 A must be attached to both the PW and HT pins.
Details of connecting an FT7X2 RS-485 wind sensor are found in App Note 162
(700-AN-162) and posted to the FTS Support site.
Figure 2-5: 8 Pin Terminal Block Wiring Guide
B
RS485/NMEA negative
A
RS485/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
