CR300 Datalogger
Compact Data logger
Ideal for small applications
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 measurement and control data logger. This small, low-cost, high-value datalogger offers fast communications, low power requirements, built-in USB, and excellent analog input accuracy and resolution. The CR300 can measure most hydrological, meteorological, environmental, and industrial sensors. It concentrates data, makes it available over varied networks, and delivers it using your preferred protocol. It 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.

The CR300 series includes Wi-Fi, cellular, or the following radio options for different regions:

  • CR300-RF407: US and Canada
  • CR300-RF412: Australia and New Zealand
  • CR300-RF422: Europe
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Benefits and Features

  • Set up easily with PC software and USB connectivity
  • Connects directly to a computer's USB port
  • First Campbell Scientific datalogger to measure 4 to 20 mA sensors natively
  • Differentiates even slight changes in data values with higher resolutions measurements (24 bit Adc)
  • Measure with confidence analog and digital sensors
  • Internet ready–email, FTP, HTTP/web, TCP
  • Almost all of the CR1000 functionality in a small form
  • Provides simple serial sensor integration and measurement with SDI-12 and/or RS-232
  • Faster processor than the one used in the CR200X or CR1000
  • Trust in the Campbell Scientific quality, including integral surge and ESD protection
  • 24 bit ADC for incredible analog measurement accuracy
  • Supports full PakBus networking
  • Network wirelessly to another node or Internet gateway with integrated radio option
  • Communicate from anywhere when using cellular or satellite peripheral
  • USB port for simplified setup and PC connection
  • Includes embedded web page for direct connection via web browser
  • 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)

Technical Description

The CR300 is a low-powered data logger designed to measure sensors, analyze data, and store data and programs. A battery-backed clock assures accurate timekeeping. The on-board, BASIC-like programming language—common to all Campbell Scientific data loggers—supports data processing and analysis routines.

The CR300 wiring panel includes a switchable 12 V terminal, and analog grounds dispersed among six analog terminals.


-NOTE- Additional specifications are listed in the CR300-Series Specifications Sheet.
Operating Temperature Range -40° to +70°C (standard)
Analog Inputs 6 single-ended or 3 differential (individually configured)
Pulse Counters 8 (P_SW, P_LL, C1, C2, and SE1 to SE4)
Voltage Excitation Terminals 2 (VX1, VX2)
Communications Ports
  • USB
  • RS-232
Switched 12 Volt 1 terminal
Digital I/O 7 terminals (C1, C2, P_SW, and SE1 to SE4) configurable for digital input and output. Includes status high/low, pulse width modulation, external interrupt, and communication functions.
Input Limits -100 mV to +2500 mV
Analog Voltage Accuracy
  • Accuracy specifications do not include sensor or measurement noise.
  • ±(0.04% of measurement + offset) at 0° to 40°C
  • ±(0.1% of measurement + offset) at -40° to +70°C
ADC 24-bit
Power Requirements 10 to 18 Vdc; 16 to 32 Vdc
Real-Time Clock Accuracy ±1 min. per month
Internet Protocols Ethernet, PPP, RNDIS, ICMP/Ping, Auto-IP(APIPA), IPv4, IPv6, UDP, TCP, TLS, DNS, DHCP, SLAAC, NTP, Telnet, HTTP(S), FTP(S), SMTP/TLS, POP3/TLS
Communication Protocols PakBus, Modbus, DNP3, SDI-12, TCP, UDP, and others
CPU ARM Cortex M4, running at 144 MHz
Warranty 3 years (against defects in materials and workmanship)
Battery-backed SRAM for CPU Usage & Final Storage 80 MB serial flash
Data Storage 30 MB serial flash
Internal Memory
  • 30 MB flash for data storage
  • 80 MB flash for CPU drive / programs
  • 2 MB flash for operating system
Idle Current Drain, Average 1.5 mA (@ 12 Vdc)
Active Current Drain, Average
  • 5 mA (@ 12 Vdc for 1 Hz scan with 1 analog measurement)
  • 23 mA (@ 12 Vdc with processor always on)
Dimensions 13.97 x 7.62 x 4.56 cm (5.5 x 3.0 x 1.8 in.)
Additional clearance required for cables and leads.
Weight 242 to 249.5 g (0.53 to 0.55 lb) depending on communication option selected
Best Analog Accuracy ±(0.04% of reading ± 6 µV) at 0° to 40°C

CR300-RF407 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Frequency 902 to 928 MHz (US, Canada)
RF Data Rate 200 kbps
Receive Sensitivity -101 dBm
Idle Current Drain, Average 12 mA (@ 12 Vdc)
Active Current Drain, Average < 80 mA (@ 12 Vdc)

CR300-RF412 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Frequency 915 to 928 MHz (Australia, New Zealand)
RF Data Rate 200 kbps
Idle Current Drain, Average 12 mA (@ 12 Vdc)
Active Current Drain, Average < 80 mA (@ 12 Vdc)

CR300-RF422 Option

Radio Type 868 MHz SRD 860 with Listen Before Talk (LBT) and Automatic Frequency Agility (AFA)
Frequency 863 to 870 MHz (European Union)
RF Data Rate 10 kbps
Receive Sensitivity -106 dBm
Idle Current Drain, Average 9.5 mA
Active Current Drain, Average 20 mA
Antenna Connector Reverse Polarity SMA (RPSMA)

CR300-CELL200 Option

-NOTE- The CR300-CELL200 option is not compatible with a Verizon cellular network.
Cell Technologies
  • 3G (UMTS/HSPA+)
2G Frequency Bands 850, 900, 1800, and 1900 MHz
3G Frequency Bands 800, 850, 900, 1900, and 2100 MHz
Antenna Connector SMA (External antenna required; see for Campbell Scientific antennas.)

CR300-CELL205 Option

-NOTE- The CR300-CELL205 option is not compatible with a Verizon cellular network.
Cell Technologies
  • 3G (UMTS/HSPA+)
  • 4G (LTE CAT-1)
3G Frequency Bands 850, 1700/2100 (AWS), and 1900
4G Frequency Bands 700, 850, 1700/2100 (AWS-1), 1900
Antenna Connector SMA (External antenna required; see for Campbell Scientific antennas.)



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 RS-232 port and C1 and C2 as a Tx/Rx pair. The CR300 does not directly support RS-485 sensors.

Measurement & Control Peripherals

The CR300 is compatible with low current and voltage solid-statey relays but not with SDM or CDM devices.


The CR300 can communicate with a PC directly via its USB port. Compatible telemetry devices include our RS-485 converters, digital cellular gateways, RF telemetry, and satellite transmitters (HDR GOES, Argos, Meteosat, Iridium, and Inmarsat). Data can be viewed on an iOS or Android device (requires our free LoggerLink app), CD295 DataView II Display, or other third-party devices. 

Data Logger Option Communications Type Integrated Communications Are Compatible with


2.4 GHz, 20 MHz bandwidth

Most other Wi-Fi devices, such as the CR310-WIFI, CR6-WIFI, NL240


902 to 928 MHz Frequency Hopping Spread Spectrum

RF407, CR6-RF407, CRVW3-RF407


915 to 928 MHz Frequency Hopping Spread Spectrum

RF412, CR6-RF412, CRVW3-RF412


868 MHz SRD860 LBT+AFA

RF422, CR6-RF422, CRVW3-RF422


The CR300 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
  • Charge 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)


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:



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.7.0 (5.17 MB) 12-02-2018

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.

An issue was found in operating systems previous to 6.0 that could cause the datalogger to become unresponsive in some systems after 50 days. This operating system resolves that issue. It is strongly recommended that all CR300s and CR310s be upgraded to this operating system.

Un problème a été détecté dans les systèmes d'exploitation, ce qui pourrait entraîner un disfonctionnement de la centrale de mesure dans certaines applications après 50 jours. Ce système d'exploitation résout ce problème. Il est fortement recommandé que toutes les CR300 et CR310 soient mises à niveau avec cet OS.

View Revision History

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

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