Campbell CS230 User manual

CS 230/CS231
Temperature Profilers
Revision: 1/19
Copyright © 2016 – 2019
Campbell Scientific

Guarantee
This equipment is guaranteed against defects in materials and workmanship.
We will repair or replace products which prove to be defective during the
guarantee period as detailed on your invoice, provided they are returned to us
prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries

Any product which has been subjected to misuse, neglect, acts of God or
damage in transit.
Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred
in removing and/or reinstalling equipment. This guarantee and the Company’s
obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.
Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a
“Declaration of Hazardous Material and Decontamination” form will be
issued for completion.
When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.
Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.
Campbell Scientific Ltd,
80 Hathern Road,
Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North
American market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.
Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,
however, that when a power supply adapter is ordered it will be suitable for use in your country.
Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.
Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.
Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse but
sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX,
UK Tel: [phone] Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

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.eu or by telephoning [phone] (UK). 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, or 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 non-essential
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.

i
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 .................................................................. 1
5. Overview .................................................................... 3
6. Specifications ............................................................ 4
7. Installation ................................................................. 5
7.1 Siting ....................................................................................................5
7.2 Mounting..............................................................................................7
7.3 Wiring ..................................................................................................7
7.4 Programming........................................................................................7
7.4.1 SDI12Recorder() Instruction.........................................................8
7.4.2 Slow Sequence Program Instructions............................................8
8. Operation ................................................................... 8
8.1 Sensor Measurements...........................................................................8
8.1.1 SDI-12 Addressing........................................................................9
8.1.2 Metadata......................................................................................11
8.2 Long Cables .......................................................................................11
8.3 Power Conservation ...........................................................................11
9. Maintenance, Calibration, and Troubleshooting ... 12
Appendices
A. Importing Short Cut Code Into CRBasic Editor... A-1
B. Example Programs ................................................ B-1
B.1 CR1000X Program for Measuring 15 Temperature Sensors............B-1
B.2 CR1000X Slow Sequence Program .................................................B-2
B.3 CR1000X Program to Read Metadata of 15 Temperature Sensors..B-3
B.4 CR1000X Program to Read Metadata and Measurements of 15
Temperature Sensors ....................................................................B-5

Table of Contents
ii
C. SDI-12 Sensor Support.......................................... C-1
C.1 Introduction......................................................................................C-1
C.2 SDI-12 Command Basics.................................................................C-1
C.2.1 Acknowledge Active Command (a!).........................................C-2
C.2.2 Send Identification Command (aI!) ..........................................C-2
C.2.3 Start Verification Command (aV!)............................................C-2
C.2.4 Address Query Command (?!) ..................................................C-3
C.2.5 Change Address Command (aAb!) ...........................................C-3
C.2.6 Start Measurement Commands (aM!).......................................C-3
C.2.7 Stopping a Measurement Command .........................................C-4
C.2.8 Send Data Command (aD0! … aD9!).......................................C-4
C.2.9 Continuous Measurement Command (aR0! … aR9!) ...............C-4
C.3 SDI-12 Transparent Mode................................................................C-4
C.3.1 Changing an SDI-12 Address....................................................C-5
C.4 References........................................................................................C-5
D. SGB3 Electrical Surge Protector .......................... D-1
D.1 SGB3 3-Line Surge Protector Specifications .................................. D-1
D.2 SGB3 3-Line Surge Protector Mounting and Wiring...................... D-1
Figures
7-1. CS231 installation example with three external sensors and five
internal sensors .................................................................................6
7-2. Internal sensor label .............................................................................6
D-1. SGB3 3-line surge protector............................................................ D-1
Tables
7-1. Wire Colour, Function, and Data Logger Connections .......................7
8-1. SDI-12 Commands...............................................................................9
8-2. SDI-12 Addresses and Positions ........................................................10
8-3. Metadata Details.................................................................................11
C-1. Campbell Scientific Sensor SDI-12 Command and Response Set...C-1
C-2. Example aM! Sequence....................................................................C-3
D-1.Wire Colour, Function, and Connections tothe SGB3 and Data
Logger.......................................................................................... D-2
CRBasic Examples
B-1. CR1000X Program for Reading CS230/CS231 with 15 Sensors.....B-1
B-2. CR1000X Program Using Slow Sequence to Read CS230/CS231
with 20 Sensors.............................................................................B-2
B-3. CR1000X Program Reading Metadata of CS230/CS231 with
15 Sensors.....................................................................................B-4
B-4. CR1000X Program Reading Metadata and Measurements of
CS230/CS231 with 15 Sensors .....................................................B-5

1
CS230/CS231 Temperature Profiler
1. Introduction
The CS230/CS231 temperature profiler provides temperature measurements
both in a rigid probe assembly and external probes using digital sensor
technology. It uses the SDI-12 communication protocol to communicate with
an SDI-12 recorder simplifying installation and programming.
SGB3 Surge Protectors were shipped with older CS230
temperature profilers (serial numbers < 1162). Newer CS230s
(serial numbers ≥1162) and all CS231s include built-in surge
protection, and therefore do not need the SGB3. For more
information, refer to Appendix D, SGB3 Electrical Surge
Protector (p. D-1).
2. Precautions
•Although the CS230/CS231 is designed to be a rugged and reliable device
for field use, care should be taken when handling or moving it to avoid
damage.
•There are no user-serviceable parts and disassembling the device will void
the warranty.
•The black outer jacket of the cable is Santoprene® rubber. This compound
was chosen for its resistance to temperature extremes, moisture, and UV
degradation. However, this jacket will support combustion in air. It is rated
as slow burning when tested according to U.L. 94 H.B. and will pass
FMVSS302. Local fire codes may preclude its use inside buildings
3. Initial Inspection
•Upon receipt of the CS230/CS231, inspect the packaging and contents for
damage. File any damage claims with the shipping company. Immediately
check package contents against the shipping documentation. Contact
Campbell Scientific about any discrepancies.
•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.
4. QuickStart
Avideo that describes data logger programming using Short Cut is available
at: www.campbellsci.eu/videos/cr1000x-datalogger-getting-started-program-
part-3.Short Cut is an easy way toprogram your data logger to measure the
sensor and assign data logger wiring terminals. Short Cut is available as a
download on www.campbellsci.eu.It is included in installations ofLoggerNet,
PC200W, PC400, or RTDAQ.
NOTE

CS230/CS231 Temperature Profiler
2
The following procedure also shows using Short Cut to program the
CS230/CS231.
1. Open Short Cut and click Create New Program.
2. Double-click the data logger model.
3. In the Available Sensors and Devices box, type CS231 or locate the
sensor in the Sensors | Temperature folder. Double-click CS230/CS231
SDI-12 Temperature Profiler. Type the correct Starting SDI-12
Address for the first external probe or the top temperature point in the
rigid probe if no external probes are included (Section 8.1.1, SDI-12
Addressing (p. 9)). Type the Number of Result Sensors.
4. Click the Wiring tab to see how the sensor is to be wired to the data
logger. Click OK after wiring the sensor.
5. Repeat steps 3 and 4 for other sensors.

CS230/CS231 Temperature Profiler
3
6. In Output Setup, type the scan rate, meaningful table names, and Data
Output Storage Interval.
7. Select the measurement and its associated output option.
8. Click Finish and save the program. Send the program to the data logger if
the data logger is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor
in data display in LoggerNet, PC400, RTDAQ, or PC200W to make sure it
is making reasonable measurements.
5. Overview
The CS231 offers the same precise temperature profiling as our CS230 SDI-12
Temperature Profiler, but designed for easier use in borehole and road
applications. The two profilers have the same programming, wiring, and
measurement specifications.
The CS230/CS231 temperature profiler uses digital sensor technology allowing
for a simple 3-wire integration. The CS230/CS231 consists of a rigid probe

CS230/CS231 Temperature Profiler
4
assembly and up to four optional external temperature probes. The rigid probe
assembly maintains the precise position of the temperature points within the
profile, while protecting the temperature sensors in all mediums.
The CS230/CS231 is suited for a wide variety of applications and
environments. The completely sealed probe assembly and external probes
permits the CS230/CS231 to be used in roadbeds, soils, and water (snow and
ice).
Examples of some applications include spring load adjustment, frost and
permafrost monitoring, soil and water temperature profiling, and snowpack
temperature profiling.
6. Specifications
Features:
•Accurate and stable measurements
•Each sensor is individually addressed and referenced to its depth
•Low power consumption
•Digital SDI-12 output
•Compatible with the following data loggers: CR200(X) Series,
CR300 Series, CR6, CR800 Series, CR1000X, CR1000, CR3000,
CR5000
Operating Range: –55 to 85 °C
Accuracy
Typical:±0.2 °C over –40 to 85 °C,
Worst Case:±0.4 °C over –40 to 85 °C;
±0.5 °C over –55 to –40 °C
(includes lifetime drift of sensor)
Resolution: 0.0078 °C
Output Protocol: SDI-12 1.3
Measurement Update Interval: 1 s (automatic), occurs in quiescent mode
Warm-up Time: 10 s
Time Constant (Ice Bath)
External Probe:60 s
Tee Sensor:720 s
Second Sensor from Tee: 420 s
Remainder of Profiler: 300 s
Maximum Sensors per Probe: 32 sensors in rigid probe assembly,
4 external sensors
External Probe Length: 45 cm (18 in)
Supply Voltage: 9 to 28 Vdc

CS230/CS231 Temperature Profiler
5
Current Consumption
Quiescent: # sensors • 1.0 mA (max)
Active (during
SDI-12 communications): 20 mA + (# sensors • 1.0 mA)
Main Diameter: 2.13 cm (0.84 in)
Maximum Length: 3.0 m (118 in)
Maximum Cable Length: 152 m (500 ft)
Minimum Sensor Spacing: 5 cm (1.97 in) in rigid probe assembly
EU Declaration of Conformity: View at www.campbellsci.eu/cs230-l or
www.campbellsci.eu/cs231-l
7. Installation
7.1 Siting
Install the CS230/CS231 directly in the medium that is to be measured. The
types of medium that can be measured are varied, including soils, roadbeds,
and water. To make the most representative measurement, it is important that
consistent contact be made between the temperature profiler and the medium.
The location of the temperature profiler should be representative of the
intended application. Typically, the first measurement point in the rigid
assembly should have a minimum burial depth of 20 cm. This helps protect the
sensor from damage in roadbed applications, and helps secure the sensor
against frost heaving. Use the external probes for measurements at shallower
depths. The external probes are sheathed in a stainless-steel housing to protect
them against possible damage.
The installation depth of the rigid assembly is referenced at the first
measurement point in the assembly (shown in FIGURE 7-1, Internal Sensor
Position #4). This information needs be addressed as part of the sensor
configuration process.

CS230/CS231 Temperature Profiler
6
FIGURE 7-1. CS231 installation example with three external sensors
and five internal sensors
FIGURE 7-1 is an example configuration with three external
sensors and five internal sensors. Each profiler is custom built to
the user’s specific requirements.
FIGURE 7-2 shows the label for the first and last internal sensor locations.
FIGURE 7-2. Internal sensor label
NOTE

CS230/CS231 Temperature Profiler
7
7.2 Mounting
Orient and secure the CS230/CS231 in the measurement medium. Keep
materials removed during installation and use that material as backfill.
While installing the CS230/CS231, the depth must be referenced between the
surface of the medium and the first measurement point in the assembly (shown
in FIGURE 7-1, Internal Sensor Position #4). If the rigid assembly is not
placed at the correct depth, all measurement depths will be out of place.
Install the external probes horizontally in the measurement medium. This helps
ensure that the most representative measurement is taken at the given depth,
and will not interfere with other nearby measurements.
Orient the signal and power cable of the CS230/CS231 towards the data logger
to avoid loops or strain on the cable. Also use a suitable trench or conduit to
protect the signal and power cable from damage.
7.3 Wiring
TABLE 7-1 provides the connections for the CS230/CS231 and Campbell
Scientific data loggers. Refer to Appendix D, SGB3 Electrical Surge Protector
(p. D-1), if the CS230 serial number is less than 1162.
TABLE 7-1. Wire Colour, Function, and Data Logger Connections
Wire Colour Function Data Logger Connection Terminal
Red Power 12V
Green SDI-12 Signal C or U1terminal configured for SDI-12
Black Power Ground G
Clear Shield
⏚
1 U terminals are automatically configured by the measurement instruction.
If multiple SDI-12 sensors are connected to a data logger, Campbell Scientific
recommends using separate terminals when possible. For the CR6 and
CR1000X, triggering conflicts may occur when a companion terminal is used
for a triggering instruction such as TimerInput(), PulseCount(), or
WaitDigTrig(). For example, if the CS230/CS231 is connected to C3 on a
CR1000X, C4 cannot be used in the TimerInput(), PulseCount(), or
WaitDigTrig() instructions.
7.4 Programming
Short Cut is the best source for up-to-date data logger programming code. If
your data acquisition requirements are simple, you can probably create and
maintain a data logger 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.
Short Cut cannot edit programs after they are imported and edited in CRBasic
Editor.

CS230/CS231 Temperature Profiler
8
A Short Cut tutorial is available in Section 4, QuickStart (p. 1). 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 data loggers are
provided in the following section. Appendix B, Example Programs (p. B-1),
provides a complete CRBasic program that measures the CS230/CS231.
7.4.1 SDI12Recorder() Instruction
The SDI12Recorder() instruction is used to measure the temperature sensors
in the CS230/CS231. This instruction sends a request to the sensor to make a
measurement and then retrieves the measurement from the sensor. See Section
8.1, Sensor Measurements (p. 8), for more information.
For most data loggers, the SDI12Recorder() instruction has the following
syntax:
SDI12Recorder(Destination, SDIPort, SDIAddress, “SDICommand”,
Multiplier, Offset, FillNAN, WaitonTimeout)
Each temperature sensor in the CS230/CS231 needs a unique SDI-12 address.
For the SDIAddress, alphabetical characters need to be enclosed in quotes (for
example, “A”). Also enclose the SDICommand in quotes as shown. The
Destination parameter must be an array. The required number of values in the
array depends on the command (TABLE 8-1).
FillNAN and WaitonTimeout are optional parameters (refer to CRBasic Help
for more information).
7.4.2 Slow Sequence Program Instructions
Use the slow sequence program instructions when the CS230/CS231
measurements will exceed the program scan interval of the additional
instruments included in the station. For example, if a CS230/CS231 consists of
17 or more temperature sensors, the time required to poll all sensors and
receive data can be greater than 5 seconds based on the 300 ms execution time
for the aR0! command. For more details on the use of the slow sequence
program instructions, reference the related LoggerNet Help,data logger
manual, or Appendix B.2, CR1000X Slow Sequence Program (p. B-2).
8. Operation
8.1 Sensor Measurements
The CS230/CS231 responds to the SDI-12 commands shown in TABLE 8-1.
When power is supplied to the CS230/CS231, the internal electronics
continuously measure temperature at a rate of approximately once per second.
Every output measurement (aR0! or aM0!) obtained from the sensor is a
running average of 10 consecutive readings. The accuracy specification is
based on an average of 10 consecutive readings. Therefore, after initial power
up, a delay of 10 s is recommended to obtain the best accuracy.
As the sensor is obtaining a measurement every second, Campbell Scientific
recommends using the continuous measurement command (aR0!) to obtain the
temperature readings. Using the aR0! commands reduces the time taken in
comparison to the aM0! to obtain a reading via the SDI-12 protocol.

CS230/CS231 Temperature Profiler
9
Outputs of both lifetime and user resettable minimum and maximum
temperatures are also available during powered operation from each
temperature point in the CS230/CS231. The user-resettable minimum and
maximum temperatures can be used to monitor specific seasons or periods of
measure, without having to review the entire data set. The lifetime minimum
and maximum temperatures are used for maintenance and warranty records.
The lifetime and user-resettable minimum and maximum temperature values
are single 1-second readings.
TABLE 8-1. SDI-12 Commands
SDI-12
Command Variable Name Description
aR0! Temperature value Temperature – floating point (°C)
aR1! Serial number, location number, depth value
(in cm)
Serial number, location number, depth value
(in cm)
aR2! Read user resettable min temperature Min. temperature – floating point (°C)
aR3! Read user resettable max temperature Max. temperature – floating point (°C)
aR4! Read lifetime min temperature Min. temperature – floating point (°C)
aR5! Read lifetime max temperature Max. temperature – floating point (°C)
aR6! Read and reset user resettable
min temperature
Min.temperature – floating point (°C). This
value constitutes theminimum ofall
1-second measurements taken since the
previous aR6! command.
aR7! Read and reset user resettable
max temperature
Max. temperature – floating point (°C). This
value constitutes themaximum ofall
1-second measurements taken since the
previous aR7!command.
aV! Verification command S1 = BootRom Signature
S2 = Firmware Signature
aAb! Change Address command
Valid addresses in sequence are:
1–9 / A–Z / a–z (no Address 0)
Sending a broadcast message with the
address change “{” can correct units that
have conflicting addresses.
aI! SDI-12 Identification command X13CAMPBELLCS230 1.0 SN:XXXXX
8.1.1 SDI-12 Addressing
Each temperature sensor has a different default SDI-12 address. The starting
addresses is 1 and coincides with the first external probe or the top temperature
point in the rigid probe if an external probe is not included. The last address
coincides with the bottom sensor in the rigid probe assembly.
If multiple SDI-12 sensors are connected to the data logger, Campbell
Scientific recommends using separate terminals when possible. However,
multiple SDI-12 sensors or multiple CS230/CS231 sensors can connect to the

CS230/CS231 Temperature Profiler
10
same data logger control or Uterminal if they have different SDI-12 addresses.
If changing the SDI-12 addresses, Campbell Scientific recommends starting the
readdressing process with the largest temperature sensor address to avoid
duplicate addresses. TABLE 8-2 provides the SDI-12 addresses and positions.
Use the default SDI-12 addresses when possible. Inadvertently
giving multiple sensors the same SDI-12 address will prevent the
sensors from communicating. Use the aA{! command, where ais
the affected address to reset the affected sensors to their factory
configured address value.
TABLE 8-2. SDI-12 Addresses and Positions
Numeric Set
Uppercase Set
Lowercase Set
1 / 1 A / 10 a / 36
2 / 2 B / 11 b / 37
3 / 3 C / 12 c / 38
4 / 4 D / 13 d / 39
5 / 5 E / 14 e / 40
6 / 6 F / 15 f / 41
7 / 7 G / 16 g / 42
8 / 8 H / 17 h / 43
9 / 9 I / 18 i / 44
J / 19 j / 45
K / 20 k / 46
L / 21 l / 47
M / 22 m / 48
N / 23 n / 49
O / 24 o / 50
P / 25 p / 51
Q / 26 q / 52
R / 27 r / 53
S / 28 s / 54
T / 29 t / 55
U / 30 u / 56
V / 31 v / 57
W / 32 w / 58
X / 33 x / 59
Y / 34 y / 60
Z / 35 a / 61
{ –reset to factory address
NOTE