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INSTRUCTION MANUAL

CS650 and CS655 Water
Content Reflectometers
Revision: 6/17

C o p y r i g h t © 2 0 1 1 - 2 0 1 7
C a m p b e l l S c i e n t i f i c , I n c .

Limited Warranty
“Products manufactured by CSI are warranted by CSI to be free from defects in
materials and workmanship under normal use and service for twelve months
from the date of shipment unless otherwise specified in the corresponding
product manual. (Product manuals are available for review online at
www.campbellsci.com.) Products not manufactured by CSI, but that are resold
by CSI, are warranted only to the limits extended by the original manufacturer.
Batteries, fine-wire thermocouples, desiccant, and other consumables have no
warranty. CSI’s obligation under this warranty is limited to repairing or
replacing (at CSI’s option) defective Products, which shall be the sole and
exclusive remedy under this warranty. The Customer assumes all costs of
removing, reinstalling, and shipping defective Products to CSI. CSI will return
such Products by surface carrier prepaid within the continental United States of
America. To all other locations, CSI will return such Products best way CIP
(port of entry) per Incoterms ® 2010. This warranty shall not apply to any
Products which have been subjected to modification, misuse, neglect, improper
service, accidents of nature, or shipping damage. This warranty is in lieu of all
other warranties, expressed or implied. The warranty for installation services
performed by CSI such as programming to customer specifications, electrical
connections to Products manufactured by CSI, and Product specific training, is
part of CSI's product warranty. CSI EXPRESSLY DISCLAIMS AND
EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. CSI hereby disclaims,
to the fullest extent allowed by applicable law, any and all warranties and
conditions with respect to the Products, whether express, implied or
statutory, other than those expressly provided herein.”

Assistance
Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs
for customers within their territories. Please visit www.campbellsci.com to
determine which Campbell Scientific company serves your country.
To obtain a Returned Materials Authorization (RMA) number, contact
CAMPBELL SCIENTIFIC, INC., phone (435) 227-9000. Please write the
issued RMA number clearly on the outside of the shipping container. Campbell
Scientific’s shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a “Statement of Product Cleanliness
and Decontamination” form and comply with the requirements specified in it.
The form is available from our website at www.campbellsci.com/repair. A
completed form must be either emailed to repair@campbellsci.com or faxed to
(435) 227-9106. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
customer’s expense. Campbell Scientific reserves the right to refuse service on
products that were exposed to contaminants that may cause health or safety
concerns for our employees.

Safety
DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND
TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES,
ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS,
TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS
INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS.
CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits.
Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or by
telephoning (435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety
regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation
sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or
maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
Prior to performing site or installation work, obtain required approvals and permits. Comply
with all governing structure-height regulations, such as those of the FAA in the USA.
Use only qualified personnel for installation, use, and maintenance of tripods and towers, and
any attachments to tripods and towers. The use of licensed and qualified contractors is highly
recommended.
Read all applicable instructions carefully and understand procedures thoroughly before
beginning work.
Wear a hardhat and eye protection, and take other appropriate safety precautions while
working on or around tripods and towers.
Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take
reasonable precautions to secure tripod and tower sites from trespassers.
Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are
installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with
overhead or underground utility lines.
Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the distance
required by applicable law, whichever is greater, between overhead utility lines and the
structure (tripod, tower, attachments, or tools).
Prior to performing site or installation work, inform all utility companies and have all
underground utilities marked.
Comply with all electrical codes. Electrical equipment and related grounding devices should be
installed by a licensed and qualified electrician.
Elevated Work and Weather
Exercise extreme caution when performing elevated work.
Use appropriate equipment and safety practices.
During installation and maintenance, keep tower and tripod sites clear of un-trained or nonessential personnel. Take precautions to prevent elevated tools and objects from dropping.
Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks,
frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions.
Periodically (at least yearly) check electrical ground connections.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS,
THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR
MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS,
ENCLOSURES, ANTENNAS, ETC.

Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.

1. Introduction ................................................................ 1
2. Precautions ................................................................ 1
3. Initial Inspection ......................................................... 1
4. QuickStart ................................................................... 2
5. Overview ..................................................................... 4
6. Specifications............................................................. 5
6.1

Electrical Specifications ....................................................................... 6
6.1.1 Current .......................................................................................... 7
6.2
Operational Specifications ................................................................... 8

7. Installation .................................................................. 9
7.1
7.2
7.3
7.4

Orientation and Placement ................................................................... 9
Proper Insertion .................................................................................... 9
Datalogger Wiring.............................................................................. 10
Programming...................................................................................... 11

8. Operation .................................................................. 11
8.1

A200 and Device Configuration Utility ............................................. 11
8.1.1 Using the A200 ........................................................................... 12
8.1.1.1 Driver Installation ............................................................ 12
8.1.1.2 RS-232 Wiring ................................................................. 12
8.1.1.3 Powering the Sensor ......................................................... 13
8.1.1.4 Determining which COM Port the A200 has been
Assigned ....................................................................... 13
8.1.2 Device Configuration Utility (DevConfig) ................................. 13
8.1.2.1 Settings Editor Tab ........................................................... 14
8.1.2.2 Send OS Tab..................................................................... 16
8.1.2.3 Terminal Tab .................................................................... 16
8.2
SDI-12 Measurements........................................................................ 17
8.2.1 M3! and M4! Commands ............................................................ 18
8.2.2 Use of Multiplexers .................................................................... 20
8.3
Water Content Reflectometer Method for Measuring Volumetric
Water Content ................................................................................. 20
8.3.1 Description of Measurement Method.......................................... 20
8.3.2 Topp Equation............................................................................. 21
8.3.3 Electrical Conductivity ............................................................... 21
8.3.3.1 Soil Electrical Conductivity ............................................. 21
8.3.3.2 Temperature Correction of Soil Electrical
Conductivity ................................................................. 22

Table of Contents
Error Sources in Water Content Reflectometer
Measurement .......................................................................... 22
8.3.4.1 Probe-to-Probe Variability Error ..................................... 22
8.3.4.2 Insertion Error ................................................................. 22
8.3.5 Temperature Dependence and Correction .................................. 23
8.3.5.1 Accurate Soil Temperature Measurement ....................... 23
8.4
Water Content Reflectometer User-Calibration ................................ 23
8.4.1 Need for Soil Specific Calibration Equation .............................. 23
8.4.2 User-Derived Calibration Equation ............................................ 24
8.4.3 Collecting Laboratory Data for Calibration ............................... 24
8.4.4 Collecting Field Data for Calibration ......................................... 27
8.4.5 Calculations ................................................................................ 28
8.3.4

9. Maintenance and Troubleshooting ......................... 29
10. References................................................................ 30
Appendices
A. Importing Short Cut Code Into CRBasic Editor ... A-1
B. Example Programs ................................................. B-1
B.1

CR1000 Programs ........................................................................... B-1
B.1.1 CR1000 with One CS650 Probe............................................... B-1
B.1.2 CR1000 with Two CS650 Probes on Same Control Port ......... B-2
B.1.3 CR1000 with 12 CS650 Probes on Multiplexer ....................... B-2
B.2
CR200X with Three CS650 Probes ................................................. B-4

C. Discussion of Soil Water Content ......................... C-1
D. SDI-12 Sensor Support .......................................... D-1
D.1
D.2

SDI-12 Command Basics ................................................................ D-1
Changing the SDI-12 Address Using Terminal Emulator and a
Datalogger .................................................................................... D-3
D.2.1 SDI-12 Transparent Mode........................................................ D-3
D.2.2 CR200(X) Series Datalogger Example .................................... D-4
D.2.3 CR1000 Datalogger Example ................................................... D-5

Figures
5-1.
6-1.
7-1.
8-1.
D-1.
D-2.

CS650 (left) and CS655 Water Content Reflectometers ..................... 4
CS650 and CS655 average current drain ............................................. 7
CS650G Insertion Guide Tool ........................................................... 10
A200 Sensor-to-PC Interface ............................................................ 12
SDI-12 transparent mode on CR200(X)-series datalogger using
control port C1/SDI12 and changing SDI-12 address from 0
to 1 ............................................................................................... D-4
SDI-12 transparent mode on CR1000 datalogger using control
port 1 and changing SD1-12 address from 3 to 1 ......................... D-5

Table of Contents

Tables
6-1.
6-2.
7-1.
8-1.
8-2.
8-3.
8-4.
9-1.
B-1.
B-2.
B-3.
B-5.
D-1.

Size Specifications ............................................................................... 6
Relative Dielectric Permittivity Specifications .................................... 8
Wire Color, Function, and Datalogger Connection for SDI-12 ......... 10
CS650 Wiring Code for RS-232 and A200 ........................................ 12
Real-Time Measurements .................................................................. 15
CS650 Terminal Commands .............................................................. 17
CS650 SDI-12 Commands ................................................................. 18
Symptom, Cause, and Solutions......................................................... 29
CR1000 Wiring for One Probe Example Program ........................... B-1
CR1000 Wiring for Two Probe Example Program .......................... B-2
CR1000 Wiring For Multiplexer Example Program ........................ B-3
CR200(X) Wiring for Example Program ......................................... B-4
CS650 SDI-12 Command and Response Set .................................. D-1

CRBasic Examples
B-1.
B-2.
B-3.
B-5.

CR1000 with One CS650 Probe ...................................................... B-1
CR1000 with Two CS650 Probes on Same Control Port ................. B-2
CR1000 with 12 CS650 Probes on Multiplexer ............................... B-3
CR200X with Three CS650 Probes ................................................. B-4

iii

Table of Contents

CS650 and CS655 Water Content
Reflectometers
1.

Introduction
The CS650 and CS655 are multiparameter smart sensors that use innovative
techniques to monitor soil volumetric water content, bulk electrical
conductivity, and temperature. They output an SDI-12 signal that many of our
dataloggers can measure.
The CS650 has 30 cm length rods, whereas the CS655 has 12 cm length rods.
This manual uses CS650 to reference model numbers CS650 and CS655.
Unless specifically stated otherwise, information in the manual applies equally
to both models.
NOTE

This manual provides information only for CRBasic dataloggers.
It is also compatible with most of our retired Edlog dataloggers.
For Edlog datalogger support, see an older manual at
www.campbellsci.com/old-manuals.

Precautions
READ AND UNDERSTAND the Safety section at the front of this
manual.
Although the CS650 is rugged, it should be handled as precision scientific
instrument.
External RF sources can affect the probe’s operation. Therefore, the probe
should be located away from significant sources of RF such as ac power
lines and motors.

Initial Inspection
Upon receipt of the CS650, inspect the packaging and contents for
damage. File damage claims with the shipping company.
The model number and cable length are printed on a label at the
connection end of the cable. Check this information against the shipping
documents to ensure the expected product and cable length are received.

CS650 and CS655 Water Content Reflectometers

QuickStart
Short Cut is an easy way to program your datalogger to measure the CS650 and
assign datalogger wiring terminals. Short Cut is available as a download on
www.campbellsci.com and the ResourceDVD. It is included in installations of
LoggerNet, PC200W, PC400, or RTDAQ.
The following procedure shows using Short Cut to program the CS650.

Open Short Cut. Click New Program.

Select Datalogger Model and Scan Interval (sensors that use SDI-12
typically require at least a 10-minute scan interval). Click Next.

CS650 and CS655 Water Content Reflectometers
3.

Under the Available Sensors and Devices list, select the Sensors |
Meterological | Soil Moisture | CS650/CS655 Water Content
Reflectometer. Four options are available that monitor different
parameters. In this tutorial, we’ll select CS650/CS655 Water Content
Reflectometer (VWC, EC, T, P, PA, and VR). Click
to move the
selection to the Selected device window. The soil temperature defaults to
degree C, and the sensor is measured hourly. These can be changed by
clicking the Temperature or Measure sensor box and selecting one of
the other options.

After selecting the sensor, click Wiring Diagram to see how the sensor is
to be wired to the datalogger. The wiring diagram can be printed now or
after more sensors are added.

CS650 and CS655 Water Content Reflectometers

Select any other sensors you have, then finish the remaining Short Cut
steps to complete the program. The remaining steps are outlined in Short
Cut Help, which is accessed by clicking on Help | Contents |
Programming Steps.

If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the
PC to datalogger connection is active, you can click Finish in Short Cut
and you will be prompted to send the program just created to the
datalogger.

If the sensor is connected to the datalogger, as shown in the wiring
diagram in step 4, check the output of the sensor in the datalogger support
software data display to make sure it is making reasonable measurements.

Overview
The CS650 measures volumetric water content, electrical conductivity,
dielectric permittivity, and temperature of soils or other porous media. These
values are reported through SDI-12 communication.

FIGURE 5-1. CS650 (left) and CS655 Water Content Reflectometers
Volumetric water content (VWC) information is derived from the probe’s
sensitivity to the dielectric permittivity of the medium surrounding the probe
stainless-steel rods. The CS650 is configured as a water content reflectometer,
with the two parallel rods forming an open-ended transmission line. A
differential oscillator circuit is connected to the rods, with an oscillator state
change triggered by the return of a reflected signal from one of the rods. The
two-way travel time of the electromagnetic waves that are induced by the
oscillator on the rod varies with changing dielectric permittivity. Water is the
main contributor to the bulk dielectric permittivity of the soil or porous media,
so the travel time of the reflected wave increases with increasing water content
and decreases with decreasing water content, hence the name water content
reflectometer. The average travel time of the reflected wave multiplied by a
scaling factor of 128 is called the period average. Period average is reported in

CS650 and CS655 Water Content Reflectometers
microseconds and is considered to be the raw output of a water content
reflectometer.
Electrical conductivity is determined by exciting the rods with a known nonpolarizing waveform and measuring the signal attenuation. Signal attenuation
is reported as a dimensionless voltage ratio, which is the ratio of the excitation
voltage to the measured voltage along the sensor rods when they are excited at
a fixed 100 kHz frequency. Voltage ratio ranges from 1 in non-conductive
media to about 17 in highly conductive media. Values greater than 17 are
highly unstable and indicate that the soil conditions are outside of the specified
operating range of the sensor.
Temperature is measured with a thermistor in contact with one of the rods.
It is well known that transmission line oscillators used for water content
measurements suffer from unwanted increases in oscillation period as
increasing electrical conductivity causes transmission line signal attenuation.
The CS650 handles this problem by making an electrical conductivity
measurement and then correcting the oscillator period accordingly. On-board
processing within the sensor head calculates electrical conductivity from the
signal attenuation measurement and combines the result with the oscillation
period measurement to calculate the dielectric permittivity of the media and
finally applies the Topp equation (Topp et al. 1980) to estimate volumetric
water content.
Probe electronics are encapsulated in the rugged epoxy probe head.
A five conductor cable including the drain or shield wire is used to provide
power and ground as well as serial communication with the CS650. The CS650
is intended to communicate with SDI-12 recorders, including Campbell
Scientific dataloggers. The orange Rx wire can be used to communicate by
means of RS-232 Tx/Rx. The A200 USB-to-Serial Module allows RS-232
serial communication between a computer and the CS650 by means of
Campbell Scientific’s Device Configuration Utility (DevConfig) software.

Specifications
Features:
Larger sample volume reduces error
Measurement corrected for effects of soil texture and electrical
conductivity
Estimates soil-water content for a wide range of mineral soils
Versatile sensor—measures dielectric permittivity, bulk electrical
conductivity (EC), and soil temperature
Compatible with Campbell Scientific CRBasic dataloggers:
CR200(X) series, CR300 series, CR6 series, CR800 series, CR1000,
CR3000, and CR5000

CS650 and CS655 Water Content Reflectometers
TABLE 6-1 compares the size of the CS650 and CS655 reflectometers.
TABLE 6-1. Size Specifications
CS650

CS655

300 mm long
3.2 mm diameter
32 mm spacing

120 mm long
3.2 mm diameter
32 mm spacing

L 85 mm
W 63 mm
D 18 mm

Probe Weight

280 g

240 g

Cable Weight

35 g m-1

Rods

Probe Head

Ingress Protection Rating:

6.1

IP68

Electrical Specifications
Sensor Output:

SDI-12
Serial RS-232

Warmup Time:

Measurement Time:

3 ms to measure
600 ms to complete SDI-12 command

Power Supply
Requirements:
Maximum Cable Length:

Electromagnetic
Compatibility:

6 Vdc to 18 Vdc
Must be able to supply 45 mA @ 12 Vdc
610 m (2000 ft) combined length for up to 25
sensors connected to the same datalogger
control port
View EU Declaration of Conformity
documentation at
www.campbellsci.com/cs650.
External RF sources can affect CS650
measurements. CS650 circuitry should be
located away from radio transmitter aerials
and cables, or measurements ignored during
RF transmissions.

CS650 and CS655 Water Content Reflectometers

6.1.1 Current
Active (3 ms):

45 mA typical @ 12 Vdc
(80 mA @ 6 Vdc, 35 mA @ 18 Vdc)

Quiescent:

135 A @ 12 Vdc

Average Current Drain:

I = 0.09n + [3.5 + 0.024(n-1)]n/s
I = average current in milliamps
n = number of CS650’s
s = number of seconds between
measurements
(see FIGURE 6-1)

FIGURE 6-1. CS650 and CS655 average current drain
FIGURE 6-1 shows average current drain for different measurement rates and
quantities of CS650 probes. If the time between measurements is five minutes
or longer, average current drain may be approximated at 0.15 milliamps per
sensor.

CS650 and CS655 Water Content Reflectometers

6.2

Operational Specifications
TABLE 6-2 provides the operational specifications.
TABLE 6-2. Relative Dielectric Permittivity Specifications
CS650

CS655

Relative Dielectric Permittivity
1 to 81

Range
Accuracy†
1 to 40:

40 to 80:

(2% of reading + 0.6)
for solution EC
3 dS/m
1.4 for solution EC
3 dS/m

(3% of reading + 0.8)
for solution EC
8 dS/m
2 for solution EC
2.8 dS/m

<0.02

Precision‡
Volumetric Water Content
Range
Accuracy†

0% to 100% (with M4 SDI-12 command)
±1% (with soil specific
calibration), ±3%
(typical with factory
VWC model) where
solution EC < 3 dS/m

±1% (with soil specific
calibration), ±3%
(typical with factory
VWC model) where
solution EC < 10 dS/m

<0.05%

Precision‡
Electrical Conductivity
Range Solution EC

0 to 3 dS/m

0 to 8 dS/m

Range Bulk EC

0 to 3 dS/m

0 to 8 dS/m

Accuracy†

(5% of reading + 0.05 dS/m)

Precision‡

0.5% of BEC

Temperature
–50 to 70 °C

Range
Resolution

0.001 °C

Accuracy†

±0.1 °C (for typical soil temperatures
[0 to 40 °C] when probe body is buried in soil),
±0.5 °C for full temperature range

Precision‡
Sensing Volume*

0.02 °C
3

7800 cm

3600 cm3

*Sensing Volume approximately 7.5 cm radius around each probe rod and 4.5 cm
beyond the end of the rods
†Accuracy specifications are based on laboratory measurements in a series of
solutions with dielectric permittivities ranging from 1 to 81 and solution electrical
conductivities ranging from 0 to 3 dS/m.
‡Precision describes the repeatability of a measurement. It is determined for the
CS650 by taking repeated measurements in the same material. The precision of
the CS650 is better than 0.05 % volumetric water content and 0.01 dS/m electrical
conductivity.

CS650 and CS655 Water Content Reflectometers

Installation
If you are programming your datalogger with Short Cut, skip Section 7.3,
Datalogger Wiring (p. 10), and Section 7.4, Programming (p. 11). Short Cut does
this work for you. See Section 4, QuickStart (p. 2), for a Short Cut tutorial.

7.1

Orientation and Placement
The CS650 measures the bulk dielectric permittivity, average volumetric water
content, and bulk EC along the length of the rods, which is 30 cm for the
CS650 and 12 cm for the CS655. The probe rods may be inserted vertically
into the soil surface or buried at any orientation to the surface. The probe may
be installed horizontal to the surface to detect the passing of wetting fronts or
other vertical water fluxes.
The sensitive volume depends on the surrounding media. In soil, the sensitive
volume extends approximately 7.5 cm (3 in) from the rods along their length
and 4.5 cm (1.8 in) beyond the end of the rods. Consequently, if the probe is
buried horizontally closer than 7.5 cm from the soil surface, it will include air
above the surface in its measurements and underestimate soil water content.
The thermistor used to measure temperature is in contact with one of the
stainless steel rods at the base of the epoxy probe body. Because of the low
thermal conductivity of stainless steel, the thermistor does not measure the
average temperature along the rod, but instead provides a point measurement of
the temperature within the epoxy. For a valid soil temperature reading, the
probe body must be in thermal equilibrium with the soil. If the probe is
installed vertically with the epoxy probe body above the surface, then the probe
body must be shielded from solar radiation and in direct contact with the soil or
media of interest.

7.2

Proper Insertion
The method used for probe installation can affect the accuracy of the
measurement. The probe rods should be kept as close to parallel as possible
when installed to maintain the design wave guide geometry. The probe is more
sensitive to permittivity close to the rods so probes inserted in a manner which
generates air voids around the rods will have reduced measurement accuracy.
In most soils, the soil structure will recover from the disturbance during probe
insertion.
In some applications, installation can be improved by using the CS650G
insertion guide tool (FIGURE 7-1). The CS650G is inserted into the soil and
then removed. This makes proper installation of the water content
reflectometer easier in dense or rocky soils.

CS650 and CS655 Water Content Reflectometers

FIGURE 7-1. CS650G Insertion Guide Tool

7.3

Datalogger Wiring
Our dataloggers typically use SDI-12 to measure the sensor because RS-232
communication requires more control ports per CS650 and RS-232
programming is more complicated than SDI-12 programming. SDI-12
communication also allows up to ten probes to be given different addresses and
then share a single control port.
TABLE 7-1 shows the SDI-12 wiring for the CS650 water content
reflectometer. SDI-12 data is transmitted to a CRBasic datalogger odd
numbered control port or U terminal. Wiring information for RS-232
communications is provided in Section 8.1.1.2, RS-232 Wiring (p. 12).
TABLE 7-1. Wire Color, Function, and Datalogger Connection
for SDI-12
Color

Function

Datalogger Connection

Green

SDI-12 Data

Control Port1 or
U configured for SDI-122

Red

SDI-12 Power

12V

Black

SDI-12 Reference

Clear

Shield

Orange

Not Used

1Dedicated
2U

SDI-12 port on CR5000
channels are automatically configured by the measurement instruction.

CS650 and CS655 Water Content Reflectometers

NOTE

7.4

The orange Rx wire is only used for RS-232 Tx/Rx
communication, and should be grounded when using SDI-12.

Programming
Short Cut is the best source for up-to-date datalogger programming code.
Programming code is needed when:
Creating a program for a new datalogger installation
Adding sensors to an existing datalogger program
If your data acquisition requirements are simple, you can probably create and
maintain a datalogger program exclusively with Short Cut. If your data
acquisition needs are more complex, the files that Short Cut creates are a great
source for programming code to start a new program or add to an existing
custom program.
NOTE

Short Cut cannot edit programs after they are imported and edited
in CRBasic Editor.
A Short Cut tutorial is available in Section 4, QuickStart (p. 2). If you wish to
import Short Cut code into CRBasic Editor to create or add to a customized
program, follow the procedure in Appendix A, Importing Short Cut Code Into
CRBasic Editor (p. A-1). Programming basics for CRBasic dataloggers are
provided here. Complete program examples for select CRBasic dataloggers can
be found in Appendix B, Example Programs (p. B-1). Programming basics and
programming examples for Edlog dataloggers are provided at
www.campbellsci.com\old-manuals.
The SDI12Recorder() measurement instruction programs CRBasic
dataloggers to measure the sensor. This instruction sends a request to the
sensor to make a measurement and then retrieves the measurement from the
sensor. See Section 8.2, SDI-12 Measurements (p. 17), for more information.
When using a CR200(X), the SDI12Recorder() instruction has the following
syntax:
SDI12Recorder(Destination,OutString,Multiplier,Offset)

For the other CRBasic dataloggers, the SDI12Recorder() instruction has the
following syntax:
SDI12Recorder(Destination, SDIPort, SDIAddress, “SDICommand”,
Multiplier, Offset)

Operation
8.1

A200 and Device Configuration Utility
The A200 Sensor-to-PC Interface allows communication between a CS650 and
a PC, allowing sensor settings to be changed through Device Configuration
Utility (DevConfig) software.

CS650 and CS655 Water Content Reflectometers

8.1.1 Using the A200
8.1.1.1 Driver Installation
If the A200 has not been previously plugged into your PC and your PC
operating system is not Windows 7, the A200 driver needs to be loaded onto
your PC.
NOTE

Drivers should be loaded before plugging the A200 into the PC.
The A200 drivers can be downloaded, at no charge, from:
www.campbellsci.com/downloads.

8.1.1.2 RS-232 Wiring
One end of the A200 has a terminal block while the other end has a type B
female USB port. The terminal block provides 12V, G, Tx, and Rx terminals
for connecting the sensor (see FIGURE 8-1 and TABLE 8-1).

FIGURE 8-1. A200 Sensor-to-PC Interface
A data cable, pn 17648, ships with the A200. This cable has a USB type-A
male connector that attaches to a PC’s USB port, and a type B male connector
that attaches to the A200’s USB port.
TABLE 8-1. CS650 Wiring Code
for RS-232 and A200

Color

Function

A200 Terminal

Orange

RxD

Green

TxD

Red

Power

+12 Vdc

Black

Reference

Clear

Shield

CS650 and CS655 Water Content Reflectometers
8.1.1.3 Powering the Sensor
The A200 provides power to the sensor when it is connected to a PC’s USB
port. An internal DC/DC converter boosts the 5 Vdc supply from the USB
connection to a 12 Vdc output that is required to power the sensor.
8.1.1.4 Determining which COM Port the A200 has been Assigned
When the A200 driver is loaded, the A200 is assigned a COM port number.
This COM port number is needed when using DevConfig. Often, the assigned
COM port will be the next port number that is free. However, if other devices
have been installed in the past (some of which may no longer be plugged in),
the A200 may be assigned a higher COM port number.
To check which COM port has been assigned to the A200, you can monitor the
appearance of a new COM port in the list of COM ports offered in your
software package such as LoggerNet before and after the installation, or look in
the Windows Device Manager list under the ports section (access via the
control panel).

8.1.2 Device Configuration Utility (DevConfig)
DevConfig may be downloaded from the Campbell Scientific website,
www.campbellsci.com/downloads.
Connect the CS650 to the A200 as shown in TABLE 8-1. Connect the PC to
the A200 USB port with the supplied USB cable.
Launch DevConfig and select CS650 Series from the Device Type menu on
the left. Select 9600 from the Baud Rate drop-down menu.

CS650 and CS655 Water Content Reflectometers
Select the appropriate PC serial port from the list of available COM ports
shown when the browse button on the lower left is selected (see Section
8.1.1.4, Determining which COM Port the A200 has been Assigned (p. 13)).

Select Ok and then Connect to begin communication with the CS650.
8.1.2.1 Settings Editor Tab
The Settings Editor tab shows settings stored in the CS650 firmware. Settings
that may be modified include User Name, SDI-12 Address, and RS-232 Baud
Rate. Attempts to change any of the other settings will result in a “Commit
failed. Unrecognized error condition” error message. DevConfig polls the
CS650 every two seconds while connected and the results are displayed in the
Real-Time Measurements field (TABLE 8-2). This is useful for verifying
probe performance.

CS650 and CS655 Water Content Reflectometers
Default communication settings are 9600 baud, no parity, 1 stop bit, 8 data bits,
and no error checking. After any changes to CS650 settings, select Apply to
write the changes to the CS650 firmware. A configuration summary is then
shown. The summary may be printed or saved electronically for future
reference.

TABLE 8-2. Real-Time Measurements
Measurement Field Name

Meaning

VWC

Volumetric Water Content

EC (dS/m)

Bulk Electrical Conductivity

TS (°C)

Soil Temperature

Bulk Dielectric Permittivity

PA ( S)

Period Average

Voltage Ratio

CS650 and CS655 Water Content Reflectometers
8.1.2.2 Send OS Tab
The Send OS tab is used to update the firmware in the CS650. The firmware is
available at www.campbellsci.com/downloads. The file to send will have a
filename extension of .a43, such as CS65X.Std.04.36.a43. Sending a new
operating system will not affect any of the user-modified settings or probe
specific multiplier and offset settings.
To download a new operating system, follow the Operating System
Download Procedure listed on the Send OS tab.

8.1.2.3 Terminal Tab
The Terminal tab may be used to send serial commands directly to the CS650.
See TABLE 8-3 for a list of serial interface commands.
To send a command from the Terminal tab, left click in the field to get a
flashing black cursor, then press several times until the CS650>
prompt is shown. At the prompt, type in the command then .

CS650 and CS655 Water Content Reflectometers

TABLE 8-3. CS650 Terminal Commands
Command

Units

1) Volumetric Water Content,
2) Electrical Conductivity,
3) Temperature

m3/m3
dS/m
°C

1) Permittivity,
2) Electrical Conductivity,
3) Temperature

dS/m
°C

1) Period,
2) Voltage Ratio,
3) Temperature

H or h

8.2

Values Returned

1)
2)
3)
4)
5)
6)

Volumetric Water Content,
Electrical Conductivity,
Temperature
Permittivity,
Period,
Voltage Ratio,

1)
2)
3)
4)
5)

Sec
°C
m3/m3
dS/m
°C
Sec

Help Menu

SDI-12 Measurements
The CS650 responds to SDI-12 commands M!, M1!, M2!, M3!, M4!, ?!, and
I!. TABLE 8-4 shows the values returned for each of these commands.
See Section 7.3, Datalogger Wiring (p. 10), for SDI-12 wiring details.
NOTE

This section briefly describes using the SDI-12 commands.
Additional SDI-12 information is available at Appendix D, SDI(p.
D-1),
www.sdi-12.org,
or
12
Sensor
Support
www.youtube.com/user/CampbellScientific.

CS650 and CS655 Water Content Reflectometers

TABLE 8-4. CS650 SDI-12 Commands
SDI-12 command
(“a” is the sensor
address)

Values Returned

Units

aM!

1) Volumetric Water Content,
2) Electrical Conductivity,
3) Temperature

m3/m3
dS/m
°C

aM1!

1) Permittivity,
2) Electrical Conductivity,
3) Temperature

dS/m
°C

aM2!

1) Period,
2) Voltage Ratio,
3) Temperature

aM3!

aM4!

aM5! .. aM9!

Sec
°C

1)
2)
3)
4)
5)
6)

Volumetric Water Content,
Electrical Conductivity,
Temperature
Permittivity,
Period,
Voltage Ratio,

m3/m3
dS/m
°C

1)
2)
3)
4)
5)
6)

Volumetric Water Content,
Electrical Conductivity,
Temperature
Permittivity,
Period,
Voltage Ratio,

m3/m3
dS/m
°C

Sec

No Values Returned

Returns the SDI-12 Address

aI!

CampbellSci, OS version, Product
Serial Number

Up to 10 CS650 probes may be connected to the same datalogger control port
as long as each one has a unique SDI-12 address. The CS650 ships with a
default SDI-12 address of 0 unless otherwise specified at the time of ordering.
The SDI-12 address may be changed through DevConfig software (see Section
8.1, A200 and Device Configuration Utility (p. 11)) or with a terminal emulator
in SDI-12 transparent mode (see Appendix D, SDI-12 Sensor Support (p. D-1)).
SDI-12 communication is established using the SDI12Recorder() CRBasic
instruction. See Appendix D, SDI-12 Sensor Support (p. D-1), for more detail on
SDI-12 communication.

8.2.1 M3! and M4! Commands
Typically, the M4! command is used to report volumetric water content,
electrical conductivity, temperature, permittivity, period, and voltage ratio. The
M4! command reports the sensor’s calculated values even if those values are
likely to be erroneous.
The M3! command uses several logical tests built into the firmware to ensure
that the sensors do not report a number that is likely to be erroneous. Erroneous

CS650 and CS655 Water Content Reflectometers
readings are either outside the sensor’s operational limits or outside of
published accuracy specifications. When one of the following conditions
occurs, the logical test replaces the calculated value with another value such as
9999999.
Permittivity < 0 or > 88
The equation used to convert period average and electrical conductivity values
to permittivity is a three-dimensional surface with two independent variables
and eleven coefficients, plus an offset. Some rare combinations of period and
electrical conductivity result in a permittivity calculation that is less than zero
or greater than 88. These rare combinations are not expected when the sensor is
in soil, but if they do occur, the M3! command will report NAN for
permittivity.
Permittivity < 1
If the CS650 calculates a permittivity value greater than zero but less than 1,
the M3! command reports a permittivity value of 1.
Permittivity too low for the Topp et al equation
The Topp et al (1980) equation used by the CS650 to estimate volumetric
water content works well for most mineral soils. However, at low water
contents, the Topp equation may report a negative value for volumetric water
content. When the estimated permittivity is greater than 1 but less than 1.881,
the M3! command reports a volumetric water content value of zero.
Permittivity more than 42
The Topp et al (1980) equation used by the CS650 to estimate volumetric
water content works well for most mineral soils up to a maximum water
content of about 0.45. If the CS650 estimates the soil permittivity to be more
than 42, which calculates to a volumetric water content of 0.52, then the M3!
command will report 9999999 or NAN for volumetric water content.
Calculated permittivity is less than 80% of the permittivity limit
A permittivity limit based on the bulk electrical conductivity (EC) reading is
used to determine whether the bulk EC at saturation exceeds the sensor’s
operational limit. That permittivity limit is calculated and compared to the
permittivity reading. If the measured permittivity is more than 20% beyond the
permittivity limit, the M3! command will report NAN or 9999999 for both
permittivity and volumetric water content. This is the most common cause of
NAN values with the CS650-series sensors, and it occurs because of soil
properties and not because of a sensor malfunction.
Bulk electrical conductivity (EC) is too high
When bulk electrical conductivity is greater than 1.14 dS/m, the solution EC is
greater than 3 dS/m, which is the upper limit for accurate readings with the
CS650. For the CS655, the upper limit for bulk EC is 3.04 dS/m,
corresponding to a solution EC of 8 dS/m. When this bulk EC condition
occurs, the soil is considered out-of-bounds and the M3! command will report
a value of NAN or 9999999 for both permittivity and volumetric water content.

CS650 and CS655 Water Content Reflectometers

Voltage ratio is too high
When the voltage ratio is greater than 17, bulk electrical conductivity readings
become unstable. When this bulk EC condition occurs, the M3! command will
report a value of NAN or 9999999 for both permittivity, volumetric water
content, and bulk EC.

8.2.2 Use of Multiplexers
Multiplexers such as Campbell Scientific’s AM16/32B may be used to connect
up to 32 CS650 probes to a single control port. When using multiplexers, the
simplest configuration is for all probes to have the same SDI-12 address.
When multiplexing CS650 probes, the switched 12V channel should be used so
that power to the sensor may be turned off under program control before the
multiplexer switches to the next channel.
CAUTION

Failure to turn off the switched 12 volt channel before
clocking the multiplexer will result in damage to the
multiplexer relays.
The proper sequence in the datalogger program for measuring CS650 probes
on a multiplexer is:
1.

Set RES control port high to enable multiplexer

Pulse CLK control port to advance to next multiplexer channel

Set switched 12 volt channel high to supply power to CS650

Send SDI-12 command(s) to CS650

Set switched 12 volt channel low to remove power from CS650

Repeat steps 2 through 5 for each CS650 connected to the multiplexer

Set RES control port low to disable multiplexer

Program examples in Appendix B, Example Programs (p. B-1), show the
commands used in CRBasic.

8.3

Water Content Reflectometer Method for Measuring
Volumetric Water Content

8.3.1 Description of Measurement Method
For the water content measurement, a differential emitter-coupled logic (ECL)
oscillator on the circuit board is connected to the two parallel stainless steel
rods. The differentially driven rods form an open-ended transmission line in
which the wave propagation velocity is dependent upon the dielectric
permittivity of the media surrounding the rods. An ECL oscillator state change
is triggered by the return of a reflected signal from the end of one of the rods.

CS650 and CS655 Water Content Reflectometers
The fundamental principle for CS650 water content measurement is that the
velocity of electromagnetic wave propagation along the probe rods is
dependent on the dielectric permittivity of the material surrounding the rods.
As water content increases, the propagation velocity decreases because of
increasing dielectric permittivity. Therefore, the two-way travel time of the rod
signal is dependent upon water content, hence the name water content
reflectometer. Digital circuitry scales the high-speed oscillator output to an
appropriate frequency for measurement by an onboard microprocessor.
Increases in oscillation period resulting from signal attenuation are corrected
using an electrical conductivity measurement. A calibration equation converts
period and electrical conductivity to bulk dielectric permittivity. The Topp
equation is used to convert from permittivity to volumetric water content.

8.3.2 Topp Equation
The relationship between dielectric permittivity and volumetric water content
in mineral soils has been described by Topp et al. (1980) in an empirical
fashion using a 3rd degree polynomial. With v the volumetric water content
and Ka the bulk dielectric permittivity of the soil, the equation presented by
Topp et al. is
v

= –5.3•10–2 + 2.92•10–2Ka – 5.5•10-4Ka2 + 4.3•10–6Ka3

It has been shown in numerous research efforts that this equation works well in
most mineral soils, so a soil specific calibration of the CS650 probe is usually
not necessary. If a soil specific calibration is desired, the user can generate an
equation relating Ka to v following the methods described in Section 8.4,
Water Content Reflectometer User-Calibration (p. 23).

8.3.3 Electrical Conductivity
8.3.3.1 Soil Electrical Conductivity
The quality of soil water measurements which apply electromagnetic fields to
wave guides is affected by soil electrical conductivity. The propagation of
electromagnetic fields in the configuration of the CS650 is predominantly
affected by changing dielectric permittivity due to changing water content, but
it is also affected by electrical conductivity. Free ions in soil solution provide
electrical conduction paths which result in attenuation of the signal applied to
the waveguides. This attenuation both reduces the amplitude of the highfrequency signal on the probe rods and reduces the bandwidth. The attenuation
reduces oscillation frequency at a given water content because it takes a longer
time to reach the oscillator trip threshold.
It is important to distinguish between soil bulk electrical conductivity and soil
solution electrical conductivity. Soil solution electrical conductivity refers to
the conductivity of the solution phase of soil. Soil solution electrical
conductivity, solution can be determined in the laboratory using extraction
methods to separate the solution from the solid and then measuring the
electrical conductivity of the extracted solution.
The relationship between solution and bulk electrical conductivity can be
described by (Rhoades et al., 1976)
bulk

solution v

solid

CS650 and CS655 Water Content Reflectometers

with bulk being the electrical conductivity of the bulk soil; solution, the soil
solution; solid, the solid constituents; v, the volumetric water content; and , a
soil-specific transmission coefficient intended to account for the tortuosity of
the flow path as water content changes. See Rhoades et al., 1989 for a form of
this equation which accounts for mobile and immobile water. This publication
also discusses soil properties related to CS650 operation such as clay content
and compaction. The above equation is presented here to show the relationship
between soil solution electrical conductivity and soil bulk electrical
conductivity.
Most expressions of soil electrical conductivity are given in terms of solution
conductivity or electrical conductivity from extract since it is constant for a
soil. Bulk electrical conductivity increases with water content so comparison of
the electrical conductivity of different soils must be at the same water content.
The calibration equation in the CS650 firmware corrects the oscillation
frequency for the effects of solution up to 3 dS m–1 for the CS650 and up to
10 dS m–1 for the CS655. This is equivalent to bulk values of approximately
0.8 dS m–1 and 2.7 dS m–1 respectively. If bulk exceeds these limits, the CS650
probe will return 99999 for dielectric permittivity and volumetric water
content. The measured period average and voltage ratio values will continue to
be reported even if the bulk EC is outside the operational range of the probe.
8.3.3.2 Temperature Correction of Soil Electrical Conductivity
The EC value reported by the CS650 is bulk electrical conductivity. This value
is temperature dependent, changing by 2% per degree Celsius. To compensate
for the effect of temperature, EC readings may be converted to a standard
temperature, such as 25 °C using the following equation:
EC25 = ECT / (1 + 0.02•(Tsoil–25)
where EC25 is the bulk value at 25 °C and ECT is the bulk value at soil
temperature Tsoil (°C).

8.3.4 Error Sources in Water Content Reflectometer Measurement
8.3.4.1 Probe-to-Probe Variability Error
All manufactured CS650s/CS655s are checked in standard media to develop a
probe specific span and offset value for electrical conductivity and dielectric
permittivity measurements. These probe specific values are written to the
probe’s firmware and minimize probe-to-probe variability.
8.3.4.2 Insertion Error
The method used for probe insertion can affect the accuracy of the
measurement. The probe rods should be kept as close to parallel as possible
when inserted to maintain the design wave guide geometry. The sensitivity of
this measurement is greater in the regions closest to the rod surface than at
distances away from the surface. Probes inserted in a manner that generates air
voids around the rods will indicate lower water content than actual. In some
applications, installation can be improved by using insertion guides or a pilot
tool. Campbell Scientific offers the CS650G insertion tool.

CS650 and CS655 Water Content Reflectometers

8.3.5 Temperature Dependence and Correction
The two temperature dependent sources of error in CS650 water content
measurements are the effect of temperature on the operation of the probe
electronics and the effect of temperature on the dielectric permittivity of the
soil.
The effect of temperature on probe electronics is minimal with period average
readings varying by less than 0.5% of the 20 °C reading over the range of 10 to
30 °C and less than 2% of the 20 °C reading over the range of –10 to 70 °C.
The larger error is caused by the change in dielectric permittivity of soil with
temperature. This is mostly due to the high temperature dependence of the
permittivity of water, which varies from a value of 88 at 0 °C to 64 at 70 °C.
Since water is the major contributor to bulk dielectric permittivity of soil,
temperature related changes to the permittivity of water will lead to
overestimation of volumetric water content at temperatures below 20 °C and
underestimation of volumetric water content at temperatures above 20 °C.
The Topp equation does not account for soil temperature. The effect of
temperature on the soil permittivity is related to soil specific properties such as
porosity and the permittivity of the soil solid phase with temperature.
Consequently, a general equation that corrects volumetric water content for
temperature for all soils is not available.
A temperature correction equation that works well in quartz sand is given by:
Corr

– 0.0044•T

+ 0.0014•T 2 + 0.0029•T – 0.0002•T + 2.4•
+ 0.32• – 0.046

– 1.6•

where Corr is the temperature corrected volumetric water content, T is soil
temperature in °C, and is the volumetric water content value at soil
temperature T.
8.3.5.1 Accurate Soil Temperature Measurement
The thermistor used for measuring soil temperature is located in the probe head
and is in contact with one of the stainless steel rods. In order to make an
accurate soil temperature measurement, the probe head should be buried in the
soil so that it is insulated from diurnal temperature fluctuations.

8.4

Water Content Reflectometer User-Calibration

8.4.1 Need for Soil Specific Calibration Equation
While the Topp equation has been determined to work well in a wide range of
mineral soils, there are soils for which a user-derived calibration will optimize
accuracy of the volumetric water content measurement. The Topp equation
underestimates the water content of some organic, volcanic, and fine textured
soils. Additionally, porous media with porosity greater than 0.5 or bulk density
greater than 1.55 g cm–3 may require a media-specific calibration equation.
In these cases, the user may develop a calibration equation to convert CS650
permittivity to volumetric water content over the range of water contents the
probe is expected to measure.

CS650 and CS655 Water Content Reflectometers

8.4.2 User-Derived Calibration Equation
The relationship between soil permittivity and volumetric water content may be
described by a quadratic equation or a third order polynomial. In many
applications, a linear equation similar to Ledieu et al (1986) gives required
accuracy.
Quadratic form:
v(Ka)

= C0 + C1•Ka + C2•Ka2

with v the volumetric water content, Ka the bulk dielectric permittivity of the
soil, and Cn, the calibration coefficient.
3rd degree polynomial form:
v(Ka)

= C0 + C1•Ka + C2•Ka2 + C3•Ka3

with v the volumetric water content, Ka the bulk dielectric permittivity of the
soil, and Cn, the calibration coefficient.
Linear form:
v(Ka)

= C0 + C1•Ka0.5

with v the volumetric water content, Ka the bulk dielectric permittivity of the
soil, and Cn, the calibration coefficient.
Two data points from careful measurements can be enough to derive a linear
calibration. A minimum of three data points are needed for a quadratic
calibration. With three evenly spaced water contents covering the expected
range, the middle water content data point will indicate whether a linear or
polynomial calibration equation is needed.
A minimum of four data points are required for derivation of a 3rd degree
polynomial. Data points should be spaced as evenly as practical over the
expected range of water content and include the wettest and driest expected
values.

8.4.3 Collecting Laboratory Data for Calibration
Water content reflectometer data needed for CS650 calibration are the CS650
permittivity reading and an independently determined volumetric water
content. From this data, the probe response to changing water content can be
described by a linear or polynomial function as described in Section 8.4.2,
User-Derived Calibration Equation (p. 24).
Required equipment:
CS650 connected to datalogger programmed to measure permittivity
Cylindrical sampling devices to determine sample volume for bulk
density, such as copper tubing with diameter of 1 inch and length at
about 2 inches.

CS650 and CS655 Water Content Reflectometers

Containers and scale to measure soil sample mass
Oven to dry samples (microwave oven can also be used)
The calibration coefficients are derived from a curve fit of known water
content and probe permittivity output. The number of data sets needed to
derive a calibration depends on the form of the calibration equation. At least
three data sets should be generated to determine whether the linear form is
valid. If a polynomial is to be used, four data sets will determine whether the
function is a quadratic or third order polynomial. Accuracy requirements may
require additional data sets. Consider the expected range of soil water content
and include data sets from the highest and lowest expected water contents.
The measurement sensitive volume around the probe rods must be completely
occupied by the calibration soil. Only soil should be in the region within
10 cm (4 in) of the rod surface. The probe rods can be buried in a tray of soil
that is dry or nearly dry. The soil will be homogeneous around the probe rods if
it is poured around the rods while dry. Also, a 20 cm diameter PVC pipe with
length about 35 cm can be closed at one end and used as the container.
It is important that the bulk density of the soil used for calibration be similar to
the bulk density of the undisturbed soil. Using dry soil without compaction will
give a typical bulk density, 1.1 to 1.4 g cm–3. This is especially important when
bulk density is greater than 1.55 g cm–3. Compaction of the calibration soil to
similar bulk density at the field site is necessary for an accurate calibration.
The typically used method for packing a container of soil to uniform bulk
density is to roughly separate the soil into three or more equal portions and add
one portion to the container with compaction. Evenly place the first loose soil
layer in the bottom of the container. Compact by tamping the surface to a level
in the container that is correct for the target bulk density. Repeat for the
remaining layers. Prior to placing successive layers, scarify (loosen) the top of
the existing compacted layer.
The container to hold the soil during calibration should be non-metal and large
enough that the rods of the probe are no closer than about 10 cm from any
container surface.
Pack the container as uniformly as possible in bulk density with relatively dry
soil (volumetric water content <10%).
Probe rods can be buried in a tray or inserted into a column. When using a
column, insert the rods carefully through surface until rods are completely
surrounded by soil. Movement of rods from side-to-side during insertion can
form air voids around rod surface and lead to measurement error.
Collect the probe permittivity output. Repeat previous step and this step three
or four times.
Determine volumetric water content by subsampling soil column after
removing probe or using mass of column. If subsampling is used, remove soil
from column and remix with samples used for water content measurement.
Repack column.

CS650 and CS655 Water Content Reflectometers
Water can then be added to the top of the container. It must be allowed to
equilibrate. Cover the container during equilibration to prevent evaporation.
The time required for equilibration depends on the amount of water added and
the hydraulic properties of the soil. Equilibration can be verified by frequently
observing the CS650 permittivity output. When permittivity is constant,
equilibration is achieved. Collect a set of calibration data values and repeat the
water addition procedure again if needed.
With soil at equilibrium, record the CS650 permittivity.
Take subsamples of the soil using containers of known volume. This is
necessary for measurement of bulk density. Copper tubing of diameter 1 inch
and length about 2 inch works well. The tubes can be pressed into the soil
surface.
It is good to take replicate samples. Three carefully handled samples will
provide good results.
The sample tubes should be pushed evenly into the soil. Remove the tube and
sample and gently trim the ends of excess soil. Remove excess soil from
outside of tube.
Remove all the soil from tube to a tray or container of known mass that can be
put in oven or microwave. Weigh and record the wet soil mass.
Water is removed from the sample by heating with oven or microwave. Oven
drying requires 24 hours at 105 °C. Microwave drying typically takes 20
minutes depending on microwave power and sample water content. ASTM
Method D4643-93 requires heating in microwave for 3 minutes, cooling in
desiccator then weighing and repeating this process until measured mass is
constant.
Gravimetric water content is calculated after the container mass is accounted
for.
m dry

m wet
g

m dry

For the bulk density
m dry
bulk

volume cylinder

the dry mass of the sample is divided by the sample tube volume.
The volumetric water content is the product of the gravimetric water content
and the bulk density
v

bulk

The average water content for the replicates and the recorded CS650
permittivity are one datum pair to be used for the calibration curve fit.

CS650 and CS655 Water Content Reflectometers

8.4.4 Collecting Field Data for Calibration
Required equipment:
CS650 connected to datalogger programmed to measure probe
permittivity
Cylindrical sampling devices to determine sample volume for bulk
density, such as copper tubing with diameter of 1 inch and length
about 2 inches.
Containers and scale to measure soil sample mass
Oven to dry samples (microwave oven can also be used)
Data needed for CS650 calibration are the CS650 permittivity output and an
independently determined volumetric water content. From this data, the probe
response to changing water content can be described by a function as described
in Section 8.4.2, User-Derived Calibration Equation (p. 24).
The calibration coefficients are derived from a curve fit of known water
content and probe permittivity output. The number of data sets needed to
derive a calibration depends on the form of the calibration equation. At least
three data sets should be generated to determine whether the linear form is
valid. If a polynomial is to be used, four data sets will determine whether the
function is a quadratic or third order polynomial. Accuracy requirements may
require additional data sets. Consider the expected range of soil water content
and include data sets from the highest and lowest expected water contents.
Collecting measurements of CS650 permittivity and core samples from the
location where the probe is to be used will provide the best on-site soil-specific
calibration. However, intentionally changing water content in soil profiles can
be difficult.
A vertical face of soil can be formed with a shovel. If the CS650 is to be used
within about 0.5 meters of the surface, the probe can be inserted into the face
and water added to the surface with percolation. After adding water, monitor
the CS650 permittivity to determine if the soil around the rods is at
equilibrium.
With soil at equilibrium, record the CS650 permittivity.
Soil hydraulic properties are spatially variable. Obtaining measurements that
are representative of the soil on a large scale requires multiple readings and
sampling. The average of several core samples should be used to calculate
volumetric water content. Likewise, the CS650 should be inserted at least 3
times into the soil recording the permittivities following each insertion and
using the average.
Remove the CS650 and take core samples of the soil where the probe rods
were inserted. This is necessary for measurement of bulk density. Copper
tubing of diameter 1 inch and length about 2 inch works well. The tubes can
be pressed into the soil surface.
It is good to take replicate samples at locations around the soil surface. Three
carefully handled samples will provide good results.

CS650 and CS655 Water Content Reflectometers
The sample tubes should be pushed evenly into the soil surface. Remove the
tube and sample and gently trim the ends of excess soil. Remove excess soil
from outside of tube.
Remove all the soil from tube to a tray or container of known mass that can be
put in oven or microwave. Weigh and record the wet soil mass. If samples must
be stored prior to weighing, seal the container with tape or inside a plastic bag
to prevent water loss and store away from direct sunlight.
Water is removed from the sample by heating with oven or microwave. Oven
drying requires 24 hours at 105 °C. Microwave drying typically takes 20
minutes depending on microwave power and sample water content. ASTM
Method D4643-93 requires heating in microwave for 3 minutes, cooling in
desiccator then weighing and repeating this process until mass is constant.
Gravimetric water content is calculated after the container mass is accounted
for.
m wet
g

m dry

For the bulk density,
m dry
bulk

volume cylinder

the dry mass of the sample is divided by the sample tube volume.
The volumetric water content is the product of the gravimetric water content
and the bulk density
v

bulk

The average water content for the replicates and the recorded CS650 period are
one datum pair to be used for the calibration curve fit.

8.4.5 Calculations
The empty cylinders used for core sampling should be clean and both empty
mass and volume are measured and recorded. For a cylinder, the volume is
volume

d
2

where d is the inside diameter of the cylinder and h is the height of the
cylinder.
During soil sampling it is important that the cores be completely filled with soil
but not extend beyond the ends of the cylinder.
Once soil core samples are obtained, place the soil-filled cylinder in a small
tray of known empty mass. This tray will hold the core sample during drying in
an oven.

CS650 and CS655 Water Content Reflectometers
To obtain mwet, subtract the cylinder empty mass and the container empty mass
from the mass of the soil filled cylinder in the tray. Remove all the soil from
the cylinder and place this soil in the tray. Dry the samples using oven or
microwave methods as described above.
To obtain mdry, weigh the tray containing the soil after drying. Subtract tray
mass for mdry. Calculate gravimetric water content, g, using
m wet
g

m dry

To obtain soil bulk density, use
m dry
bulk

volume cylinder

Volumetric water content is calculated using
v

bulk

Maintenance and Troubleshooting
The CS650 does not require periodic maintenance. TABLE 9-1 provides
troubleshooting information.
TABLE 9-1. Symptom, Cause, and Solutions
Symptom
All CS650 output
values read 0

Possible Cause

Solution

No SDI12Recorder
instruction in
datalogger program

Add SDI12Recorder
instruction to datalogger
program

Conditional statement
that triggers reading is
not evaluating as true

Check logic of
conditional statement that
triggers readings

First value reads
NAN and all other
values read 0* or
never change from
one measurement to
another

CS650 SDI-12 address
does not match
address specified in
datalogger program

Change probe address or
modify program so that
they match

(*or all values read
NAN if the program
examples in this
manual are followed)

CS650 green wire not
attached to SDI port
specified in datalogger
program

Connect wire to correct
control port or modify
program to match wiring

CS650 and CS655 Water Content Reflectometers

TABLE 9-1. Symptom, Cause, and Solutions
Symptom

Possible Cause
CS650 not being
powered

Solution
Make sure red wire is
connected to 12V or
SW12V and black wire to
G.
If using SW12 to power
sensor, make sure red
wire is connected and
datalogger program
switches SW12 on.

VWC reading is
9999999

Soil bulk permittivity
is outside probe’s
operational range

Modify program to
collect permittivity value
and try soil specific
calibration

EC reading is
9999999

Soil bulk electrical
conductivity is outside
probe’s operational
range

If using CS650, try
CS655

Readings erratic,
including NAN’s and
9999999’s

Multiple probes with
same SDI-12 address
sharing same control
port

Give probes unique
addresses or put on
separate control ports

10. References
Ledieu, J., P. De Ridder, P. De Clerck, and S. Dautrebande. 1986. “A method
of measuring soil moisture by time-domain reflectometry,” J. Hydrol.
88:319-328.
Rhoades, J.D., P.A.C. Raats, and R.J. Prather. 1976. Effects of liquid-phase
electrical conductivity, water content and surface conductivity on bulk soil
electrical conductivity. Soil Sci. Soc. Am. J., 40: 651-653.
Rhoades, J.D., N.A. Manteghi, P.J. Shouse, W.J. Alves. 1989. Soil electrical
conductivity and soil salinity: New formulations and calibrations. Soil Sci.
Soc. Am. J., 53:433-439.
Topp, G.C., J.L. Davis & A.P. Annan. 1980. “Electromagnetic determination
of soil water content: measurements in coaxial transmission lines,” Water
Resources Research, v. 16, No. 3:574-582.

Appendix A. Importing Short Cut Code
Into CRBasic Editor
This tutorial shows:
How to import a Short Cut program into a program editor for
additional refinement
How to import a wiring diagram from Short Cut into the comments of
a custom program
Short Cut creates files, which can be imported into CRBasic Editor. Assuming
defaults were used when Short Cut was installed, these files reside in the
C:\campbellsci\SCWin folder:
.DEF (wiring and memory usage information)
.CR2 (CR200(X)-series datalogger code)
.CR300 (CR300-series datalogger code)
.CR6 (CR6-series datalogger code)
.CR8 (CR800-series datalogger code)
.CR1 (CR1000 datalogger code)
.CR3 (CR3000 datalogger code)
.CR5 (CR5000 datalogger code)
Use the following procedure to import Short Cut code and wiring diagram into
CRBasic Editor.

NOTE

Create the Short Cut program following the procedure in Section 4,
QuickStart (p. 2). Finish the program and exit Short Cut. Make note of the
file name used when saving the Short Cut program.

Open CRBasic Editor.

Click File | Open. Assuming the default paths were used when Short Cut
was installed, navigate to C:\CampbellSci\SCWin folder. The file of
interest has the .CR2, .CR300, .CR6, .CR8, .CR1, .CR3, or .CR5
extension. Select the file and click Open.

Immediately save the file in a folder different from
C:\Campbellsci\SCWin, or save the file with a different file name.

Once the file is edited with CRBasic Editor, Short Cut can no
longer be used to edit the datalogger program. Change the name
of the program file or move it, or Short Cut may overwrite it next
time it is used.
5.

The program can now be edited, saved, and sent to the datalogger.

Import wiring information to the program by opening the associated .DEF
file. Copy and paste the section beginning with heading “-Wiring for
CRXXX–” into the CRBasic program, usually at the head of the file. After
pasting, edit the information such that an apostrophe (') begins each line.
This character instructs the datalogger compiler to ignore the line when
compiling.

A-1

Appendix B. Example Programs
B.1 CR1000 Programs
B.1.1 CR1000 with One CS650 Probe
This CRBasic example program measures one CS650 probe on a CR1000
every 15 minutes, storing hourly averages of volumetric water content,
electrical conductivity, and soil temperature and samples of permittivity, period
average and voltage ratio. The CS650 has an SDI-12 address of 0. Wiring for
the example is shown in TABLE B-1.
TABLE B-1. CR1000 Wiring for One Probe Example Program
CR1000

CS650

12V

Red

Green

Black, Orange, Clear

CRBasic Example B-1. CR1000 with One CS650 Probe
Public CS650(6)
'Assign aliases to the public array
Alias CS650(1)=VWC: Alias CS650(2)=EC: Alias CS650(3)=TSoil
Alias CS650(4)=Perm: Alias CS650(5)=PerAvg: Alias CS650(6)=VoltR
Units VWC = m^3/m^3: Units EC = dS/m: Units TSoil = deg C
DataTable (DatoutCS650,1,-1)
DataInterval (0,60,Min,2)
Average (3,CS650(1),FP2,False)
Sample(3,CS650(4),IEEE4)
EndTable
BeginProg
Scan (15,Min,0,0)
SDI12Recorder (CS650(),1,0,"M4!",1.0,0)
CallTable DatoutCS650 'Call Data Table
NextScan
EndProg

B-1

Appendix B. Example Programs

B.1.2 CR1000 with Two CS650 Probes on Same Control Port
This CRBasic example program measures two CS650 probes on a CR1000
every 15 minutes, storing hourly averages of volumetric water content,
electrical conductivity, and soil temperature and samples of permittivity, period
average and voltage ratio. The first CS650 has an SDI-12 address of 0 and the
second has an address of 1. Wiring for the example is shown in TABLE B-2.
Assignment of aliases and units is not shown in this example.
TABLE B-2. CR1000 Wiring for Two Probe Example Program
CR1000

CS650’s (wiring same for both)

12V

Red

Green

Black, Orange, Clear

CRBasic Example B-2. CR1000 with Two CS650 Probes on Same Control Port
Public CS650(6)
Public CS650_2(6)
DataTable (DatoutCS650,1,-1)
DataInterval (0,60,Min,2)
Average (3,CS650(1),FP2,False)
Sample(3,CS650(4),IEEE4)
Average (3,CS650_2(1),FP2,False)
Sample(3,CS650_2(4),IEEE4)
EndTable
BeginProg
Scan (15,Min,0,0)
SDI12Recorder (CS650(),1,0,"M4!",1.0,0)
SDI12Recorder (CS650_2(1),1,1,"M4!",1.0,0)
CallTable DatoutCS650 'Call Data Table
NextScan
EndProg

B.1.3 CR1000 with 12 CS650 Probes on Multiplexer
This CRBasic example program measures 12 CS650 probes 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 probes are addressed with SDI-12 address of 0. In this
example, the probes are powered through the switched 12V channel and
require 3 seconds warm-up time per probe. Total time to measure all 12 probes
is more than 36 seconds. Alternately, all of the red wires for the probes 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.

B-2

Appendix B. Example Programs

TABLE B-3. CR1000 Wiring For Multiplexer Example Program
CR1000

AM16/32B (2x32 mode)

12V

GND

RES

CLK

SW12

COM ODD H

COM ODD L

COM Ground

CS650

High Channels 1H – 12H

Red

Low Channels 1L – 12L

Green

Ground Channels to Left of
Low Channels

Black, Orange, Clear

CRBasic Example B-3. CR1000 with 12 CS650 Probes on Multiplexer
Dim LCount
Public CS650(12,6)
DataTable (DatoutCS650,1,-1)
DataInterval (0,60,Min,2)
Average (72,CS650(),IEEE4,False)
EndTable
BeginProg
Scan (15,Min,0,0)
PortSet(2,1)
'Turn AM16/32 Multiplexer On
Delay(0,150,mSec)
LCount=1
SubScan(0,uSec,12)
PulsePort(3,10000)
'Switch to next AM16/32 channel
SW12 (1 )
'Apply power to CS650
Delay (0,3,Sec)
'Wait three seconds for probe to warm up
SDI12Recorder (CS650(LCount,1),1,0,"M4!",1.0,0)
LCount=LCount+1
SW12 (0)
'Remove power from CS650
NextSubScan
PortSet(2,0)
'Turn AM16/32 Multiplexer Off
Delay(0,150,mSec)
CallTable DatoutCS650
'Call Data Table
NextScan
EndProg

B-3

Appendix B. Example Programs

B.2 CR200X with Three CS650 Probes
This CRBasic example program measures three CS650 probes on a CR200X
every 15 minutes, storing hourly averages of volumetric water content,
electrical conductivity, soil temperature, permittivity, period average, and
voltage ratio. The CS650s have SDI-12 addresses of 0, 1, and 2, respectively.
Sensors are powered with the SWBatt channel, which requires a 3 second
warm-up time. Alternately, the red wires may be connected to Battery + for
continuous power which would reduce measurement time. Wiring for the
example is shown in TABLE B-4. Assignment of aliases and units is not shown
in this example.
TABLE B-4. CR200(X) Wiring for Example Program
CR200(X)

CS650’s (Wiring same for all)

SW Battery

Red

C1/SDI-12

Green

G channels

Black, Orange, Clear

CRBasic Example B-4. CR200X with Three CS650 Probes
Public CS650(18)
DataTable (CS650,1,-1)
DataInterval (0,60,Min)
Average (18,CS650(),False)
EndTable
BeginProg
Scan (15,Min)
SWBatt (1 )
Delay (3,sec)

'Apply power to CS650's
'Warm-up time of 3 seconds

'CS650 #1
SDI12Recorder (CS650(1),"0M4!",1,0)
'CS650 #2
SDI12Recorder (CS650(7),"1M4!",1,0)
'CS650 #3
SDI12Recorder (CS650(13),"2M4!",1,0)
SWBatt (0 )
CallTable CS650
NextScan
EndProg

B-4

'Remove power from CS650's
'Call Data Table

Appendix C. Discussion of Soil Water
Content
The water content reflectometer measures volumetric water content. Soil water
content is expressed on a gravimetric and a volumetric basis. To obtain the
independently determined volumetric water content, gravimetric water content
must first be measured. Gravimetric water content ( g) is the mass of water per
mass of dry soil. It is measured by weighing a soil sample (mwet), drying the
sample to remove the water, then weighing the dried soil (mdry).

m water
m soil

m wet

m dry

Volumetric water content ( v) is the volume of liquid water per volume of soil.
Volume is the ratio of mass to density ( b) which gives:

m water
v

volume water
volume soil

water

m soil

soil

water

soil

The density of water is close to 1 and often ignored.
Soil bulk density ( bulk) is used for soil and is the ratio of soil dry mass to
sample volume.
m dry
bulk

volume sample

Another useful property, soil porosity ( ), is related to soil bulk density as
shown by the following expression.

bulk
solid

The term solid is the density of the soil solid fraction and is approximately
2.65 g cm–3.

C-1

Appendix D. SDI-12 Sensor Support
D.1 SDI-12 Command Basics
SDI-12 commands have three components:
Sensor address (a) – a single character, and is the first character of the
command. CS650 sensors are usually assigned a default address of zero unless
option –VS is selected at the time of ordering. Sensors with the –VS option are
addressed with the last digit of the probe’s serial number. This allows for
multiple CS650’s to be connected to a single control port without requiring the
user to change the SDI-12 addresses from zero.
Command body (e.g., M1) – an upper case letter (the “command”) followed by
alphanumeric qualifiers.
Command termination (!) – an exclamation mark.
An active sensor responds to each command. Responses have several standard
forms and terminate with (carriage return – line feed).
SDI-12 commands supported by the CS650 are listed in TABLE D-1.
Continuous and concurrent measurements are not supported.
TABLE D-1. CS650 SDI-12 Command and Response Set
Name

Command

Response

Acknowledge
Active

Send Identification

aI!

allccccccccmmmmmmvvvxxx...xx

Change Address

aAb!

Address Query

Start Measurement

aM!

atttn

Send Data

aD0!
aD1!

Additional
Measurements

aM1!
aM2!
aM3!
aM4!

atttn

Address Query Command (?!)
Command ?! requests the address of the connected sensor. The sensor replies
to the query with the address, a.

D-1

Appendix D. SDI-12 Sensor Support
Change Address Command (aAb!)
Sensor address is changed with command aAb!, where a is the current address
and b is the new address. For example, to change an address from 0 to 2, the
command is 0A2!. The sensor responds with the new address b, which in this
case is 2.
Send Identification Command (aI!)
Sensor identifiers are requested by issuing command aI!. The reply is defined
by the sensor manufacturer, but usually includes the sensor address, SDI-12
version, manufacturer’s name, and sensor model information. Serial number or
other sensor specific information may also be included.
An example of a response from the aI! command is:
313CampbellCS65X 000Std.00.35=2196405
where:
Address = 3
SDI-12 version =1.3
Manufacturer = Campbell
Sensor model = CS65X
OS version = 000Std.00.35
Sensor serial number = 2196405
Start Measurement Commands (aM!)
A measurement is initiated with M! commands. The response to each
command has the form atttnn, where
a = sensor address
ttt = time, in seconds, until measurement data are available
nn = the number of values to be returned when one or more subsequent D!
commands are issued.
Start Measurement Command (aMv!)
Qualifier v is a variable between 1 and 3 that requests variant data. Variants
include different subsets of the CS650 probe output:

D-2

M0!

Volumetric Water Content ( ), Bulk Electrical Conductivity ( ),
Temperature (°C)

M1!

Permittivity ( ), Bulk Electrical Conductivity ( ), Temperature (°C)

M2!

Period ( ), Voltage Ratio ( ) Temperature (°C)

M3!

Volumetric Water Content ( ), Bulk Electrical Conductivity ( ),
Temperature (°C), Permittivity ( ), Period ( ), Voltage Ratio ( )

M4!

Volumetric Water Content ( ), Bulk Electrical Conductivity ( ),
Temperature (°C), Permittivity ( ), Period ( ), Voltage Ratio ( )

Appendix D. SDI-12 Sensor Support
Aborting a Measurement Command
A measurement command (M!) is aborted when any other valid command is
sent to the sensor.
Send Data Command (aDv!)
This command requests data from the sensor. It is normally issued
automatically by the datalogger after measurement commands aMv!. In
transparent mode, the user asserts this command to obtain data. If the expected
number of data values are not returned in response to an aD0! command, the
data logger issues aD1!. The limiting constraint is that the total number of
characters that can be returned to an aD0! command is 35 characters. If the
number of characters exceed the limit, the remainder of the response are
obtained with the subsequent aD1! command.

D.2 Changing the SDI-12 Address Using Terminal
Emulator and a Datalogger
Up to ten CS650’s or other SDI-12 sensors can be connected to a single
datalogger control port. Each SDI-12 device on the same control port must
have a unique SDI-12 address. The CS650 supports addresses of 0-9, a-z, and
A-Z.
The factory-set SDI-12 address for the CS650 is 0 when the probe is ordered
with the –DS option or the last digit of its serial number when ordered with the
–VS option. The CS650 SDI-12 address is changed by issuing the aAb!
command where a is the current address and b is the new address. The current
address can be found by issuing the ?! command.
The easiest way to change the address on a CS650 sensor is with DevConfig
and an A200 Sensor to PC Interface as described in Section 8.1, A200 and
Device Configuration Utility (p. 11). However, if an A200 is not available, it is
possible to change the address by connecting a single CS650 to an SDI-12
compatible control port on a datalogger and utilizing SDI-12 transparent mode
to send commands directly to the sensor.

D.2.1 SDI-12 Transparent Mode
System operators can manually interrogate and enter settings in probes using
transparent mode. Transparent mode is useful in troubleshooting SDI-12
systems because it allows direct communication with probes. Datalogger
security may need to be unlocked before transparent mode can be activated.
Transparent mode is entered while the PC is in telecommunications with the
datalogger through a terminal emulator program. It is easily accessed through
Campbell Scientific datalogger support software, but is also accessible with
terminal emulator programs such as Windows HyperTerminal. Datalogger
keyboards and displays cannot be used.
The terminal emulator is accessed by navigating to the Datalogger menu in
PC200W, the Tools menu in PC400, or the Datalogger menu in the Connect
screen of LoggerNet.

D-3

Appendix D. SDI-12 Sensor Support
The following examples show how to use LoggerNet software to enter
transparent mode and change the SDI-12 address of a CS650 sensor. The same
steps are used to enter transparent mode with PC200W and PC400 software
after accessing the terminal emulator as previously described.

D.2.2 CR200(X) Series Datalogger Example
1.

Connect a single CS650 to the datalogger as follows:
Green to Control Port C1/SDI12
Black, Orange, Clear to G
Red to Battery +

In the LoggerNet Connect screen navigate to the Datalogger menu and
select Terminal Emulator. The “Terminal Emulator” window will open. In
the Select Device menu, located in the lower left-hand side of the window,
select the CR200Series station.

Click on the Open Terminal button.

Press the key until the datalogger responds with the “CR2XX>”
prompt. At the “CR2XX>” prompt, make sure the All Caps Mode box is
checked and enter the command SDI12 . The response “SDI12>”
indicates that the CS650 is ready to accept SDI-12 commands.

To query the CS650 for its current SDI-12 address, key in ?! and
the CS650 will respond with its SDI-12 address. If no characters are typed
within 60 seconds, then the mode is exited. In that case, simply enter the
command SDI12 again and press .

FIGURE D-1. SDI-12 transparent mode on CR200(X)-series datalogger
using control port C1/SDI12 and changing SDI-12 address from 0 to 1
6.

D-4

To change the SDI-12 address, key in aAb! where a is the
current address from the above step and b is the new address. The CS650
will change its address and the datalogger will respond with the new
address. To exit SDI-12 transparent mode select the Close Terminal
button.

Appendix D. SDI-12 Sensor Support

D.2.3 CR1000 Datalogger Example
1.

Connect a single CS650 to the datalogger as follows:
Green to Control Port C1
Black, Orange, Clear to G
Red to 12V

Click on the Open Terminal button.

Press the key until the datalogger responds with the “CR1000>”
prompt. At the “CR1000>” prompt, make sure the All Caps Mode box is
checked and enter the command SDI12 . At the “Enter Cx Port 1,
3, 5, or 7” prompt, key in the control port number where the CS650 green
lead is connected and . The response “Entering SDI12 Terminal”
indicates that the CS650 is ready to accept SDI-12 commands.

FIGURE D-2. SDI-12 transparent mode on CR1000 datalogger using
control port 1 and changing SD1-12 address from 3 to 1
6.

D-5

Appendix D. SDI-12 Sensor Support

D-6

Campbell Scientific Companies
Campbell Scientific, Inc.
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UNITED STATES
www.campbellsci.com info@campbellsci.com

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CANADA
www.campbellsci.ca dataloggers@campbellsci.ca

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Somerset West 7129
SOUTH AFRICA
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Santo Domingo, Heredia 40305
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THAILAND
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