UHF/VHF电台 / AL200
AL200 ALERT2 Encoder, Modulator, and Sensor Interface
ALERT2 Ready
Improved accuracy and performance for flood warning systems
气象 应用支持 水资源 应用支持 能源 应用支持 湍流通量 应用支持 基础结构/工业设施 应用支持 土壤 应用支持


The AL200 is an ALERT2 encoder and modulator that supports ALERT2 and ALERT-concentration services. It meets the ALERT2 standards maintained by National Hydrologic Warning Council (NHWC) and ALERT Users Group (AUG). ALERT2 improves the accuracy and performance of flood warning systems and software, by providing you with faster data transfer, forward error correction, and a TDMA architecture.

With integrated sensor inputs, the AL200 allows you to create a minimal ALERT2 transmitter/station, decreasing the cost of a typical flood warning system. Combining the AL200 with a Campbell Scientific data logger provides enhanced sensor support, user-defined logic and control, and data logging capabilities.

Note: Portions of the AL200 embedded code were developed and copyrighted by Blue Water Design LLC and are used under license.


3D/CAD 文件:


Channels Available and Their Functions

  • P1: Tipping Bucket / Switch Closure Count Accumulator
  • SE1: Single-ended Analog Input, millivolt or milliamp
  • C1: Digital for limited SDI-12 or High/Low State
  • SW12: Switched power for powering sensors
  • G: Ground

ALERT2 Reporting

When used standalone, the AL200 can generate time and event driven reports for Battery, Clock Status, Tipping Bucket, Analog Input (mV or mA), Digital (SDI-12 or High/Low State).


Power Connector Two-wire, 0.15-in. pitch removable terminal (reverse polarity protected)
Power Requirements 9 to 18 Vdc
Configuration Device Configuration Utility over USB (settable modulation levels using Device Configuration Utility)
LEDs GPS, Serial, Radio (RS-232 and CS I/O share serial activity LED.)
CS I/O Port SDC 7, 8,10, or 11 (multiplexed with on-board sensor interface)
RS-232 Port DCE
USB Port Micro-B
Temperature Range -40° to +60°C
Communication Rate
  • 1200 to 57,600 bps (RS-232 DCE Port)
  • 9600 to 460.8 kbps (CS I/O Port)
Current Drain
  • 1.5 mA (@ 12 Vdc when idle)
  • 40 mA (@ 12 Vdc during GPS fix)
  • 35 mA (@12 Vdc during transmit)
Timekeeping Setting via GPS ±1 μs
Drift ±0.17 s/day (without GPS sync, 40°C temperature change)
Analog Input (SE1) Sensor Interface 0 to 5 Vdc (16-bit ADC; millivolt or 4 to 20 mA selectable)
Protocols Supported ALERT1 and ALERT2
SMA Connector Active GPS antenna
Test Button Test transmit and tone
Dimensions 16 x 7.7 x 2.2 cm (6.3 x 3.0 x 0.9 in.)

Sensor Interface

Channels Available Switch closure (P1), single-ended analog (SE1), limited SDI-12 (C1), switched 12 V, ground
Analog input (SE1) 0 to 5 Vdc, 16-bit Adc (millivolt or 4 to 20 mA selectable)

Radio Interface

Channels Available TX, PTT, switched battery, ground
RCFSK Modulation 100 to 1000 mV, ±50 mV (software selectable)


Compliance RoHS and CE
Product Standard EN 61326-1:2013
Test Standards
  • IEC 61000-4-2, Electrostatic Discharge Immunity
  • IEC 61000-4-3, Radiated RF Immunity
  • IEC 61000-4-4, Electrical Fast Transients Immunity
  • IEC 61000-4-5, Surge Immunity
  • IEC 61000-4-6, Conducted RF Immunity
  • CIPSR 11, Class B Emission


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
21X (retired)
CR10 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR295X (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR9000 (retired)

Additional Compatibility Information

The AL200 supports ALERT1 and ALERT2 protocols.

A standalone AL200 can measure:

  • Analog sensors with 0 to 5 V or 0 to 20 mA output
  • SDI-12 sensors
  • Float / contact switch sensors
  • CS451 and CS456 Pressure Transducers
  • CS475, CS476, and CS477 Radar Water-Level Sensors
  • CS460 Pressure Transducer
  • SR50A Sonic Ranging Sensor
  • CS11 AC Current Sensor


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