CR6 Measurement and Control Datalogger
One Datalogger, Countless Applications
Featuring advanced
vibrating-wire technology
weather applications supported water applications supported energy applications supported gas flux & turbulence applications supported infrastructure applications supported soil applications supported

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The CR6 measurement and control datalogger is a powerful core component for your data-acquisition system. We combined the best features of all our dataloggers and added faster communication, low power requirements, built in USB, compact size, and improved analog input accuracy and resolution. The CR6 also introduces our new universal (U) terminal, an ingenious way to allow virtually any sensor—analog, digital, or smart—to be connected to any U terminal. This is also our first multipurpose datalogger capable of doing static vibrating-wire measurements.

Benefits and Features

  • Powerfully versatile—multi-tool of data acquisition
  • U terminals configurable to what you want them to be: analog or digital, input or output
  • Static vibrating-wire measurements using our patented spectral analysis
  • Surge and overvoltage protection on all terminals
  • Flexible power input from solar panel, DC power supply, 12 V battery, or USB
  • Onboard communication via Ethernet 10/100
  • Wiring made easy through removable terminal block
  • Create or join a Wi-Fi network with the CR6-WIFI (option)
  • Medium- and long-range license-free radio compatibility for most countries (optional)
  • MicroSD card drive for extended memory requirements
  • Support for serial sensors with RS-232 and RS-485 native
  • CPI for hosting Campbell high-speed sensors and distributed modules (CDMs)
  • Programmable with CRBasic or SCWin program generator, completely PakBus compatible
  • Shared operating system (OS) with the popular CRBasic CR1000 and CR3000 dataloggers
  • Web server capability, including data display, configuration, diagnostics, and security


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  • CPU: 32 bit with hardware FPU, running at 100 MHz
  • Internal Memory: 4 MB SRAM for data storage and optional removable microSD for up to 16 GB, 1 MB flash for program, 6 MB flash for OS
  • Micro SD Drive for extended data storage up to 16 GB
  • Clock Accuracy: ±3 min per year, optional GPS correction to 10 µs
  • USB micro B for direct connection to PC (limited power source during configuration), 2.0 full speed, 12 Mbps
  • 10/100 Ethernet RJ-45 for LAN connection
  • CS I/O port for connection to Campbell Scientific modems and displays
  • CPI port for terminal expansion using Campbell Distributed modules (CDM)
  • Battery terminal pair for regulated 12 V power input or rechargeable 12 V VRLA (valve-regulated, lead-acid) for UPS mode, 2.5 A @ 20°C
  • Charge terminal pair for 16 to 32 V from dc power converter or 12 or 24 V solar panel,
    1.2 A @ 20°C
  • Two switched 12 V terminals for powering sensors or communication devices, 1.1 A @ 20°C
  • Continuous 12 V terminal
  • Best Analog Accuracy: ±(0.04% of reading + 2 µV), 0° to 40°C
  • Best Effective Resolution: 50 nV (±200 mV range, differential measurement, input reversal, 5 Hz fN1)
  • Weight: 0.42 kg (0.92 lb)
  • Dimensions: 20.3 x 10.2 x 6.1 cm (8.0 x 4.0 x 2.4 in)
  • RoHS approved

Temperature Range

  • Standard: -40° to +70°C
  • Extended: -55° to +85°C

Twelve Universal (U) Terminals

U terminals are software configurable for analog or digital functions.

  • Analog functions consist of:
    • Analog inputs: 12 single-ended or 6 differential with ±5000 mV, ±1000 mV, ±200 mV ranges 24 bit ADC
    • Analog outputs: ±2.5 V or ±2.5 mA ranges for bridge measurements 12 bit DAC
    • Static frequency-analyzed vibrating wire: terminal pair both excites to 12 V p-p and 100 Hz to 6.5 kHz and reads vibrating-wire transducers using our patented spectral-analysis technology (VSPECT™)
    • Thermistor: completion resistor internal 5 kΩ
    • Period average: up to 200 kHz, amplitude dependent
    • Low level ac: 1 Hz to 20 kHz, amplitude dependent
  • Digital I/O functions consist of 5 V or 3.3 V logic levels for:
    • General status/control
    • Voltage source 5 V, 3.3 V, 20 mA @ 3.5 V
    • Timer I/O
    • Switch closure (150 Hz) or high frequency counter (1 MHz)
    • Pulse width modulation
    • Interrupts
    • SDI-12 and SDM
    • Serial asynchronous communication Tx/Rx pairs

Four control (C) Terminals

C terminals are software configurable for digital functions. Digital I/O functions consist of 5 or 3.3 V logic levels for:

  • General status/control
  • Voltage source 5 V, 3.3 V: 11 mA @ 3.5 V
  • Timer I/O
  • Switched closure (150 Hz) or high frequency counter (1 MHz)
  • Pulse width modulation
  • Interrupts
  • SDI-12 and SDM
  • RS-232/RS-485: half or full duplex, Tx/Rx pairs



The CR6 has 12 U terminals and four C terminals that are programmable for a variety of functions. This allows the CR6 to measure virtually any sensor, including voltage, resistive bridge, static vibrating wire, pulse, switch closure, SDI-12, and serial RS-232/RS-485.

Measurement & Control Peripherals

The CR6 includes an interface that allows it to connect directly with our CDM device (the SC-CPI interface is not required). The CR6 is also compatible with all of our contemporary SDMs, multiplexers, terminal input modules, and relays. 


The CR6 has an on-board 10/100baseT port for Ethernet communication, a USB port for communication with a PC, and a slot to store data on a microSD card. Compatible telemetry devices include our multidrop modems, short-haul modems, phone modems (land line, digital cellular, and voice-synthesized), RF telemetry, and satellite transmitters (Argos, High Data Rate GOES, and Meteosat). Data can be viewed on the CR1000KD Keyboard Display, CD100 Mountable Display with Keyboard, or an iOS or Android device (requires LoggerLink).


The CR6 and its power supply can be housed in any of our standard enclosures.


The CR6 uses an external power source and has a built-in charger/regulator. Intelligent power sourcing autoselects the highest voltage from three input sources (Chg, Bat, or USB) to operate in one of the following four modes:

  • UPS (recommended) - A 16 to 32 Vdc source, solar panel or charge regulator, is used to charge a 12 Vdc battery, such as our BP7, BP12 or BP24.
  • 12 Vdc battery or other reliable 12 Vdc source
  • Chg only - DC power supply (16 to 32 Vdc)
  • USB - powered over 5 Vdc USB port for setup, programming, and testing (will not charge battery or boost USB power to provide 12 Vdc to SW12 or 12V Power Output terminals)  


CRBasic, the CR6's full programming language, supports simple or complex programming and many on-board data reduction processes. Compatible software includes:

  • LoggerNet (version 4.3 or higher)
  • DevConfig (version 2.10 or higher)
  • PC400 (version 4.3 or higher)
  • PC200W (version 4.3 or higher)
  • Short Cut (version 3.1 or higher)
  • CRBasic (version 3.5 or higher)
  • LoggerLink (version 1.3 or higher)
  • RTDAQ (version 1.2 or higher)
  • LNDB (version 1.2 or higher)


CR6 OS v.6.03 (5.99 MB) 28-04-2017

Execution of this download installs the CR6 Operating System and Compiler on your computer.  It also updates the CR6 support files for the CRBasic Editor. 

Note: Upgrading the Operating System will reset all the CR6’s settings back to the factory defaults.  Sending this OS remotely is not recommended.  To restore settings after the update, it is recommended that a backup be made of the current logger settings or take programmatic measures to ensure your settings can be restored. This can be done using the DevConfig backup utility or CRBasic instruction SetSetting.

Watch the Video Tutorial: Sending an OS to a Local Datalogger.

View Revision History

Device Configuration Utility v.2.14 (44.9 MB) 23-12-2016

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 10, 8, 7, Vista, and XP (Both 32 and 64 bit)

Known Windows XP Issue:

This software release includes Campbell Scientific USB drivers that will not install on Windows XP. To keep current with up and coming security requirements, the drivers have been signed with a SHA-256 encryption which is not supported by Windows XP. Windows XP users who have a need to install USB drivers for Campbell Scientific products can contact Campbell Scientific for an alternate solution.

View Revision History

CPI Calculator v.1.0 (2.49 MB) 06-07-2016

The CPI Calculator is a downloadable Microsoft Excel spreadsheet used to estimate the usage and capacity of a CPI network.  The calculator provides an overview on CPI devices including the CDM-A108, CDM-A116, CDM-VW300, CDM-VW305, and the CSAT3B.  The calculator can also estimate the measurement speed of the CDM-A108 and CDM-A116 based on the number of channels and measurement parameters.


The CPI Calculator is an estimation tool and will help you better understand and design CPI networks by considering the following:

  1. What is the capability of each CDM or CPI device
  2. What is the CPI network capacity
  3. How much of the CPI capacity are the CDMs or CPI devices using


Related FAQs

Number of FAQs related to CR6: 3

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  1. The CR6 can support up to 11 AM25T devices in ideal conditions. Typical systems generally use 3 to 5 AM25Ts per datalogger because of practical limitations including the location of the AM25T, the quantity of sensor wire, the wiring complexity, and the wire length. 

  2. Campbell Scientific sells, and embeds in their products, microSD cards that have single-level cell (SLC) memory. In contrast, many electronics retailers sell microSD cards that have multi-level cell (MLC) memory. The difference between these two types of memory is significant.

    • The SLC microSD cards from Campbell Scientific are better suited for industrial and environmental applications where wide operating temperatures, low power consumption, and longevity are very important. Most SLC memory cards are designed with industrial applications in mind and, therefore, often have additional perks such as enhanced protection from ESD (electrostatic discharge) and mechanical damage.
    • The MLC microSD cards commonly available at electronics retailers are less expensive, but they are generally not well suited for the majority of applications in which Campbell Scientific data acquisition products are used.
  3. The serial modem can be connected to a CR6 using any of the following methods:

    • Connect the modem to the RS-232/CPI port on the CR6 using cable pn 31055 (RS-232/CPI RJ45 to DB9 Male DTE).
    • Connect the modem to the RS-232/CPI port on the CR6 using cable pn 31056 (RS-232/CPI RJ45 to DB9 Female DCE).
    • Connect the modem to a C or U terminal pair on the CR6, where the pair has been configured for serial I/O.
    • Connect the modem to the CS I/O port on the CR6 using an SC105.

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