B.3 CR1000X with 12 CS650 sensors on
multiplexer
This CRBasic example program measures 12 CS650 sensors on a AM16/32B multiplexer every 15
minutes, storing hourly averages of volumetric water content, electrical conductivity, soil
temperature, permittivity, period average, and voltage ratio. All sensors are addressed with SDI-
12 address of 0. In this example, the sensors are powered through the switched 12V terminal and
require 3 seconds warm-up time per sensor. Total time to measure all 12 sensors is more than 36
seconds. Alternately, all of the red wires for the sensors could be connected to a bus separate
from the multiplexer with the bus connected to 12V for continuous power. This would decrease
measurement time. Wiring for the example is shown in TABLE B 3. Assignment of aliases and
units is not shown in this example.
Table B-3: CR1000X wiring for multiplexer example program
CR1000X
AM16/32B (2x32 mode)
CS650
12V
12V
G
GND
C2
RES
C3
CLK
SW12
COM ODD H
C1
COM ODD L
G
COM Ground
High terminals 1H – 12H
Red
Low terminals 1L – 12L
Green
Ground terminals to left of low terminals
Black, orange, clear
CS650 and CS655 Water Content Reflectometers
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