CR300 Datalogger
Capable, Compact Datalogger
Low cost, high functionality
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 CR300 is a multi-purpose, compact, low-cost measurement and control datalogger. This entry level datalogger, with its rich instruction set, can measure most hydrological, meteorological, environmental and industrial sensors. It will concentrate data, making it available over varied networks and deliver it using your preferred protocol. The CR300 also performs automated on-site or remote decision making for control and M2M communications. The CR300 is ideal for small applications requiring long-term, remote monitoring and control.

Benefits and Features

  • Set up easily with PC software and USB connectivity
  • First Campbell Scientific datalogger to measure 4 to 20 mA sensors natively
  • Measure with confidence analog and digital sensors
  • Internet ready–email, FTP, HTTP/web, TCP
  • Almost all of the CR1000 functionality in a small form
  • Trust in the Campbell Scientific quality, including integral surge and ESD protection
  • Faster processor than the one used in the CR200X or CR1000
  • 24 bit ADC for incredible analog measurement accuracy
  • Network wirelessly to another node or Internet gateway with integrated radio option
  • USB port for simplified setup and PC connection
  • Communicate from anywhere when using cellular or satellite peripheral
  • Save money and space using the integrated 12 V battery solar charge regulator
  • Compliant with Modbus, PakBus, and DNP3 protocols
  • CR300-WIFI ideal for short-range, wireless IP communication
  • Measure smart sensors using RS-232 or SDI-12
  • Email services that require SMTPS (TLS-encrypted SMTP) supported
  • Connect with PakBus, Modbus, DNP3, GOES, and other standard communication protocols
  • Programmable with CRBasic or SCWin program generator, completely PakBus compatible
  • Similar operating system (OS) as the CR1000 OS
  • Analyze and control with programmability and multiple general purpose I/O
  • Notify with event-driven communications and physical outputs


Top tilt view
Top tilt view
Top tilt view
Top view
Top tilt view
Front view
Back view
Left view
Right view
Bottom view
CR300 Datalogger attached to a TX321-G GOES Transmitter (sold separately)
CR300 Datalogger cabled to a TX321-G GOES Transmitter (sold separately)


-NOTE- Note: Additional specifications are listed in the CR300 Specifications Sheet.
CPU ARM Cortex M4, running at 144 MHz
Internal Memory
  • 30 MB flash for data storage
  • 80 MB flash for CPU drive / programs
  • 2 MB flash for operating system
Clock Accuracy ±1 min per month
USB Micro B For direct connection to PC (limited power source during configuration), 2.0 full speed, 12 Mbps
Best Analog Accuracy ±(0.04% of reading ± 6 µV) at 0° to 40°C
Best Effective Resolution 0.23 μV (±34 mV range, differential measurement, input reversal, 50/60 Hz fN1)
Operating Temperature Range -40° to +70°C
Dimensions 14.0 x 7.6 x 4.6 cm (5.5 x 3.0 x 1.8 in.)
Weight 242 g (0.53 lb)

CR300-RF407 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Frequency 902 to 928 MHz (US, Canada)
Channel Capacity Eight 25-channel hop sequences sharing 64 available channels
RF Data Rate 200 kbps
Average Additional Current Contribution @ 12 Vdc
  • 45 mA (transmit)
  • 12 mA (idle on)
  • 4 mA (idle 0.5 s power mode)
  • 3 mA (idle 1 s power mode)
  • 1.5 mA (idle 4 s power mode)
Compliance Information
  • MCQ-XB900HP (United States FCC Part 15.247)
  • 1846A-XB900HP (Industry Canada [IC])
  • RCPDIXB15-0672-A2 (Mexico IF)

CR300-RF412 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Frequency 915 to 928 MHz (Australia, New Zealand)
Channel Capacity Eight 25-channel hop sequences sharing 31 available channels
RF Data Rate 200 kbps
Average Additional Current Contribution @ 12 Vdc
  • 45 mA (transmit)
  • 12 mA (idle on)
  • 4 mA (idle 0.5 s power mode)
  • 3 mA (idle 1 s power mode)
  • 1.5 mA (idle 4 s power mode)
Compliance Information
  • MCQ-XB900HP (United States FCC Part 15.247)
  • 1846A-XB900HP (Industry Canada [IC])

CR300-RF422 Option

Radio Type F868 MHz SRD 860 with Listen Before Talk (LBT) and Automatic Frequency Agility (AFA)
Frequency 863 to 870 MHz (European Union)
Channel Capacity 30 channels (default), software configurable for meeting local regulations; 10 sequences for reducing interference through channel hop
RF Data Rate 10 kbps
Average Additional Current Contribution @ 12 Vdc
  • 20 mA (transmit)
  • 9.5 mA (idle on)
  • 3.5 mA (idle 0.5 s power mode)
  • 2.5 mA (idle 1 s power mode)
  • 1.5 mA (idle 4 s power mode)
Compliance Information View the compliance information in the Documents section of the web page.
Antenna Connector Reverse Polarity SMA (RPSMA)
Compliance Information
  • Note: The user is responsible for emissions if changing the antenna type or increasing the gain.
  • XF6-RS9113SB (United States FCC ID)
  • 8407A-RS9113SB (Industry Canada [IC])


Measurement & Control Peripherals

The CR300 is typically not used with measurement and control peripherals because of its limited number of control ports. It could creatively be used with one or two multiplexers max or three terminal input modules. It is also compatible with low on current and voltage solid-state relays.

The CR300 is not compatible with SDM or CDM devices.


With several channel types, the CR300 is compatible with nearly every available sensor. This includes analog output voltage (0 to 2.5 V) and current (0 to 20 mA or 4 to 20 mA) sensors, thermistors, and RTDs to name a few. It is also compatible with pulse or frequency output sensors such as anemometers, rain gauges, and flow meters. SDI-12, Modbus, and other serial sensors are supported with the RS232 port and C1 and C2 as a Tx/Rx pair. The CR300 does not directly support RS485 sensors.


The CR300 can communicate with a PC via its USB port. Compatible telemetry devices include our multidrop modems, short-haul modems, digital cellular modems, RF telemetry, and satellite transmitter (GOES high data rate). Data can be viewed on an iOS device, an Android device, or CD295 DataView II Display. To use an iOS or Android device, go to the Apple Store or Google Play and download our free LoggerLink Mobile Apps.


For the CR300 series, compatible software includes:

  • LoggerNet (version 4.4 or higher)
  • DevConfig (version 2.12 or higher)
  • PC400 (version 4.4 or higher)
  • PC200W (version 4.4 or higher)
  • Short Cut (version 3.2 or higher)
  • CRBasic (version 3.6 or higher)
  • LNDB (version 1.3 or higher)
  • LoggerLink (version 1.5 or higher)
  • LoggerNet Mobile Connect (version 1.1 or higher)

The CR300 series is not compatible with:



The CR300 series 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 (SP10, SP20), or power converter (29796) is used to charge a 12 Vdc battery, such as our BP7 or BP12.
  • 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 the switched battery terminal SW12)


An ENC10/12 or ENC12/14 enclosure is adequate for most CR300-based systems. Applications with minimal power requirements can use the ENC200 enclosure to house the CR300 and the 16869 Sealed Rechargeable Battery. The ENC200 cannot house a barometer or a battery that is larger than the 16869.


CR300 Series OS v.5.01 (3.96 MB) 20-01-2017

This download is for the CR300 series of dataloggers including all CR300 and CR310 models. Execution of this download installs the CR300 series Operating System and Compiler on your computer.  It also updates the CR300 series support files for the CRBasic Editor.

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

View Revision History

CR300 QuickStart Program (569 KB) 15-03-2016

The CRBasic program referenced in the CR300 QuickStart videos and manual.

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