This product is no longer available and has been replaced by: CR310,CR300. Some accessories, replacement parts, or services may still be available.
CR205 Datalogger with 915-MHz Spread-Spectrum Radio
Services Available
Repair No
Calibration No
Free Support No


In September 2005, the CR205 Datalogger was replaced by the CR206 Datalogger. The CR206 has improved communication capability. The CR205 can be used within a CR206(X) network, but the CR206(X) needs to be in the transparent mode. Contact one of our application engineers for details.

Benefits and Features

  • Ideal where only a few sensors will be measured
  • Stores 32,000 data points (nonvolatile)
  • Data format is table-based



  • A/D converter: 12 bit
  • Scan rate: once per second (max)
  • Single-ended analog channel: 5, individually configured
  • Analog voltage range: 0 to +2500 mV
  • Measurement resolution: 0.6 mV
  • Excitation channels: 2, programmable for either +2.5 or +5 volts
  • Switched battery port: 1
  • Pulse count channels: 2
  • Control ports: 2
  • Battery voltage range: 7 to 16 Vdc
  • On-board 12 Vdc lead acid battery charger
  • Communications: RS-232


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
05103-45-L (retired)
05103-45-L (retired)
05106-L (retired)
05106-L (retired)
110PV-L (retired)
237-L (retired)
CMP11-L (retired)
CMP6-L (retired)
CS15-L (retired)
CS215-L (retired)
CS300-L (retired)
CS410-L (retired)
CS431-L (retired)
CS431-L (retired)
CS450-L (retired)
CS455-L (retired)
CS460-L (retired)
CS460-L (retired)
CS470 (retired)
CS470 (retired)
CS471 (retired)
CS475-L (retired)
CS525-L (retired)
CS525-L (retired)
CS625 (retired)
CS625 (retired)
CSAT3 (retired)
ENVIROSCAN (retired)
HMP45C-L (retired)
HMP45C-L (retired)
LI190SB-L (retired)
LI200X-L (retired)
OBS-3+ (retired)
OBS300 (retired)
SEN12512 (retired)
SR50A-L (retired)
WXT520 (retired)


Product Compatible Note
LoggerNet Version 2.1 or higher
PC200W (retired)
PC400 Version 1.0 or higher
PCONNECT (retired) Version 3.0 or higher
PCONNECTCE (retired) Version 2.0 or higher
Short Cut
VISUALWEATHER Version 2 or higher

Additional Compatibility Information


The CR205's internal spread spectrum radio can transmit data to other CR205 loggers or RF400 radios. It can also communicate with CR206(X) loggers, RF401 radios, or RF430 radios if they are set to the transparent mode. Certain CR205 settings must match the radio's settings for communications between the data logger and radio to be successful. The factory default settings of these devices might not match; therefore, they may need to be reconfigured before communications can take place. 

The CR205 can communicate with a PC via direct connect, NL100 Ethernet interface, MD485 multidrop modem, and digital cellular modems. Data can be viewed on the CD295 DataView II display, Archer-PCon Field PC, or a user-supplied PDA (PConnect or PConnectCE software required).

Measurement & Control Peripherals

The CR205 is not compatible with SDM devices and multiplexers.


The CR205 can measure a variety of sensors including SDI-12 sensors and 4 to 20 mA sensors. It cannot make differential measurements and is not compatible with the freezing-rain/ice, fuel moisture/temperature, geographic position, present weather, soil heat flux, soil matric water potential, and strain sensors listed on our price lists.


Applications with minimal power requirements can use the ENC200 enclosure to house the data logger and the #16869 sealed rechargeable battery. The ENC200 cannot house a barometer or a battery that is larger than the #16869. However, an ENC10/12 or ENC12/14 enclosure is adequate for most CR205-based systems.

Power Supplies

The CR205 uses an external power supply and has a built-in regulator. When connected to the on-board charging circuit, the sealed rechargeable battery should be 7 Ahr or smaller. Using larger batteries with the data logger's built-in charger may result in excessive PC board heating. This is especially a concern when the battery is deeply discharged or failing with a shorted cell. Campbell Scientific also recommends that solar panels be 10 W or less and wall chargers be 1 A or smaller.


CR200 MODBUS OS v.10 (1.97 MB) 08-09-2010

Special operating system that supports ModBus communication and SDI-12 sensors .  Also included is the Compiler and CRBasic Editor support files for the CR2xx dataloggers.

Use of this file will update the datalogger compiler and CRBasic Editor support files.

Note: Not to be used with the CR200X series.

Includes: MODBUS Instructions, SDI12Sensor, WindVector
Excludes: GOES Instructions, SerialInput, ETO, SendData, & LoggerIdentify

CR200 Serial Input OS v.10 (1.97 MB) 08-09-2010

Special operating system that supports serial sensors, SDI-12 sensors, and sending data to another PakBus device.  Also included is the Compiler and CRBasic Editor support files for the CR2xx dataloggers.

Use of this file will update the datalogger compiler and CRBasic Editor support files.

Includes: SerialInput, SendData, SDI12Sensor, WindVector
Excludes: GOES Instructions, ETo, MODBUS Instructions, LoggerIdentify

Device Configuration Utility v.2.29 (54 MB) 15-11-2023

A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.

Supported Operating Systems:

Windows 11 or 10 (Both 32 and 64 bit)

View Update History

Short Cut v.4.5 (32.4 MB) 02-05-2024

Short Cut creates simple programs for our CR200-series, CR300-series, CR510, CR500, CR10(X), 21X, CR23X, CR6, CR800, CR1000(X), CR3000, CR5000, CR9000X and GRANITE dataloggers. Both mixed array and table data operating systems are supported. Short Cut also supports our ET106, ET107 and MetData1 weather stations. The newest version includes the latest sensor files.

View Update History

CR200 Default OS v.10 (1.97 MB) 08-09-2010

Default operating system loaded into the datalogger at the factory.  Also included is the Compiler and CRBasic Editor support files for the CR2xx dataloggers.

Use of this file will update the datalogger compiler and CRBasic Editor support files.

Includes: ETo, WindVector, LoggerIdentify
Excludes: GOES Instructions, SDI12Sensor, SerialInput, MODBUS Instructions, SendData

View Update History

Frequently Asked Questions

Number of FAQs related to CR205: 4

Expand AllCollapse All

  1. The CR200-series dataloggers vary in several ways from our other data loggers. The CR200-series, initially designed to work in the field as wireless sensors, do not provide the same level of accuracy as our other data loggers. The CR206, CR211, and CR216 have built-in spread-spectrum radios; other telemetry options are limited. The CR200-series dataloggers also have a one-year warranty, compared to the three-year warranty for our other data loggers.

  2. A practical maximum is to connect one multiplexer per every two control terminals on the data logger. Control terminals can be shared between multiplexers to increase the number of connected multiplexers. Sharing terminals, however, requires more complex wiring and programming. Users who would like to connect more than one multiplexer per every two control terminals are advised to contact a sales or support engineer at Campbell Scientific for assistance.

  3. The CR200X-series and the retired CR200-series dataloggers are NOT compatible with SDMs or multiplexers. If more channels are needed or may be needed in the future, consider purchasing a CR800, CR850, or CR1000 instead.

  4. The CR200-series datalogger is unique in that it does not have an on-board program compiler like other Campbell Scientific data loggers. This means that the CRBasic file (*.cr2) must be compiled on the computer first, and then the compiled binary file (*.bin) must be sent to the data logger. When a program is created in CRBasic, the last step is to compile the file and, therefore, create the program BIN file.

    It is very important that the compiler used to generate the BIN file match the operating system version in the data logger. If a BIN file is sent to the data logger and the compiled version does not match the current OS, the program send will fail and an "Incorrect OS Version" message will be displayed. 

    To help avoid issues with OS version mismatch, if the CR2 file is chosen as the file to download to the data logger, LoggerNet version 2.1b and greater will first query the data logger for its OS version and then attempt to find the matching compiler in the LoggerNet program files directory (by default, this is C:\Program Files\Campbellsci\LoggerNet). If the matching compiler exists, LoggerNet will compile the file and send that file to the data logger. Note that if the *.bin file is chosen, LoggerNet will not compile the file before sending it.

    The software CD that is shipped with each CR200-series datalogger contains the appropriate compiler for the data logger OS. Copy this file into the LoggerNet program files directory so that it is available for use by LoggerNet. In CRBasic, select this file as the compiler to be used when compiling CR2 files from the Options | Supported Loggers menu item.

Casos de estudio

Utah: Alarmed Water Monitoring System
The Duck Creek system consists of seven monitoring sites: two tanks, two chlorination buildings, more
Washington: Weather and Water Quality Station
The Poulsbo Marine Science Center is a non-profit educational facility located on Liberty Bay more