Best-Value Datalogger
Lower cost and small size
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The CR300 is a small, low-cost, high-value datalogger. It includes most of the features of our other dataloggers plus faster communications, low power requirements, built-in USB, and excellent analog input accuracy and resolution. Additionally, the CR300 is the first Campbell Scientific datalogger that can measure 4 to 20 mA sensors natively.

Benefits and Features

  • Small size, simplicity, and rugged construction for a quality instrument at a modest price
  • Charge on-site battery (solar or ac-dc power converter) with inbuilt power regulator
  • Create or join a Wi-Fi network with the CR300-WIFI (option)
  • Operate on a very modest power budget
  • Internet ready–email, FTP, HTTP/web, TCP–with required add-ons
  • Trust in the Campbell Scientific quality, including integral surge and ESD protection
  • Measure multiple analog voltage or current sensors
  • Measure multiple pulse output or serial/digital sensors
  • Network wirelessly to another node or Internet gateway with integrated radio option
  • Communicate from anywhere when using cellular or satellite peripheral
  • Connect via a wide variety of modems for remote telemetry
  • Save money and space using the integrated 12 V battery solar charge regulator
  • Communicate using PakBus, Modbus, DNP3 and other standard protocols
  • CR300-WIFI ideal for short-range, wireless IP communication
  • Measure smart sensors using RS-232 or SDI-12
  • Send encrypted/secure email messages and alarms (TLS-encrypted SMTP)
  • Connect with PakBus, Modbus, DNP3, GOES, and other standard communication protocols
  • Campbell quality surge and ESD protection
  • Simplified setup with PC connection using USB port
  • Analyze and control with programmability and multiple general purpose I/O
  • Notify with event-driven communications and physical outputs
  • Set up easily with PC software and USB connectivity
  • Available with integrated radio for wireless communication
  • Measure with confidence analog and digital sensors


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-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 5.1 cm (5.5 x 3.0 x 2.0 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])

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.


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 purchase our 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)
  • LoggerLink (version 1.5 or higher)
  • LNDB (version 1.3 or higher
  • LoggerNet Mobile Connect 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, 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.

Related Documents


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

Execution of this download installs the CR300 Operating System and Compiler on your computer.  It also updates the CR300 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.