CR300 Datalogger
Compact Datalogger
Ideal for small applications
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The CR300 is a multi-purpose, compact measurement and control datalogger. 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

  • Connects directly to a computer's USB port
  • Differentiates even slight changes in data values with higher resolutions measurements (24 bit Adc)
  • Provides simple serial sensor integration and measurement with SDI-12 and/or RS-232
  • Supports full PakBus networking
  • Includes embedded web page for direct connection via web browser


CR300 front tilt view
CR300 front tilt view
CR300 front tilt view
CR300 glam view
CR300 front tilt view
CR300 front view
CR300 front view
CR300 front tilt view
CR300 with Ships With parts
CR300 back view
CR300 left view
CR300 right view
CR300 top view
CR300 bottom view
CR300 and CR300-RF407
CR300 Datalogger attached to a TX321-G GOES Transmitter (sold separately)
CR300 Datalogger cabled to a TX321-G GOES Transmitter (sold separately)
CR300-RF407 glam view
CR300-RF407 front view
CR300-RF407 front view
CR300-RF407 front tilt view
CR300-RF407 front tilt view
CR300-RF407 with antenna (sold separately)
CR300-RF407 with antenna (sold separately)
CR300-RF407 with antenna (sold separately)
CR300-RF407 with antenna (sold separately)
CR300-RF412 glam view
CR300-RF412 front view
CR300-RF422 glam view
CR300-RF422 front view
CR300-WIFI glam view
CR300-WIFI front view

Detailed Description

The CR300 is a low-powered datalogger 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 dataloggers—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 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
  • RS-485
Switched 12 Volt 1
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 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, SNMPv3, NTP, Telnet, HTTP(S), FTP(S), SMTP/TLS, POP3/TLS
Communication Protocols PakBus, Modbus, DNP3, SDI-12, TCP, UDP, and others
Warranty 3 years (against defects in materials and workmanship)
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 option selected


CPU Drive 80 MB serial flash
Data Storage 30 MB serial flash

CR300-RF407 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Output Power 5 to 250 mW (user-selectable)
Frequency 902 to 928 MHz (US, Canada)
RF Data Rate 200 kbps
Antenna Connector RPSMA (External antenna required; see for Campbell Scientific antennas.)

CR300-RF412 Option

Radio Type Frequency Hopping Spread Spectrum (FHSS)
Output Power 5 to 250 mW (user-selectable)
Frequency 915 to 928 MHz (Australia, New Zealand)
RF Data Rate 200 kbps
Receive Sensitivity -101 dBm
Antenna Connector RPSMA (External antenna required; see for Campbell Scientific antennas.)

CR300-RF422 Option

Radio Type 868 MHz SRD 860 with Listen Before Talk (LBT) and Automatic Frequency Agility (AFA)
Output Power 2 to 25 mW (user-selectable)
Frequency 863 to 870 MHz (European Union)
RF Data Rate 10 kbps
Antenna Connector RPSMA (External antenna required; see for Campbell Scientific antennas.)

CR300-WIFI Option

Operational Modes Client or Access Point
Operating Frequency 2.4 GHz, 20 MHz bandwidth
Antenna Connector Reverse Polarity SMA (RPSMA)
Antenna pn 16005 unity gain (0 dBd), 1/2 wave whip, omnidirectional with articulating knuckle joint for vertical or horizontal orientation
Transmit Power 7 to 18 dBm (5 to 63 mW)

CR300-CELL200 Option

Cell Technologies
  • 3G (UMTS/HSPA+)
2G Frequency Bands 850, 900, 1800, and 1900 MHz
3G Frequency Bands 800, 850, 900, 1900, and 2100 MHz



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. 

Datalogger 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


2G Frequency Bands 850, 900, 1800, 1900

3G Frequency Bands 800, 850, 900, 1900, 2100




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.6.01 (3.82 MB) 10-18-2017

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.

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 Update History

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

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