A755 SDI12 / ModBus GPRS Telemetry Datalogger

  • 40 channel SDI12 / ModBus Channels Plus 2 Digital Inputs (ie Rain Gauge /Flow Meter)
  • Add telemetry capability to Campbell Scientific Dataloggers Using ModBus - any input into Campbell Scientific logger
  • Multiple power options Micro-Solar Panels, Lithium batteries, Rechargeable batteries, AC/DC mains power
  • Send commands from RTU to RTU GSM/GPRS or UHF Radio
Product Options


The A755 GSM/GPRS SDI12/ModBus telemetry data logger is an extremely compact, rugged and low-power RTU designed to provide users of SDI-12 and ModBus sensors with an inexpensive and reliable unit for logging and transmitting environmental data. It has a large memory, is extremely easy to install and setup, has IP-67 connectors, a quad-band Motorola GPRS modem, and much more.

Manufactured by: Adcon Telemetry
Model: A755 SDI12 / ModBus GPRS Telemetry Datalogger

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Weather stations
Soil moisture monitoring
Science, research and development
Water quality monitoring
Environmental monitoring
Accepts up to 40 ModBus parameters/sensors


Case Aluminum, powder coated
Protection Class IP-67
Dimensions and Weight 160 x 60 x 80 mm / 6.3 x 2.4 x 3.1 inches 1150g / 2.4lb.
Connectors for Sensors and Power Made in Germany by Binder
IP-67 protection class
Sockets: brass, nickel plated, with gold plated socket contacts
Protective cap
2 x M9 female 7-pin to sensor
1 x M9 female 5-pin to power
Antenna Connector TNC with external seal, water tight, Made in Germany
Mounting Mast mounting bracket integrated
Operating Temperature -20°C ... +65°C / -4°F ... 149°F
-30°C ... +75°C / -22°F ... 167°F extended temp. range upon request
Sensor Input 1 for standard SDI-12 sensors; up to 40 values can be addressed
Counter Inputs 2 for standard reed contacts; electronically debounced, e.g. for rain gauges; max frequency up to 30 pulses per second; min. pulse length 17ms, min. break time 17ms
Digital I/O Ports 1 x 3V TTL
1 x 5V TTL
Both I/Os can be configured as either inputs or outputs
Memory 2MB for up to 500.000 readings
Data Transmission:
Frequencies 900 & 1800 MHz (Europe) and
850 & 1900 MHz (Americas)
Modem Motorola G24L
Motorola G24 and H24 upon request
SIM-Cards Small footprint
Security SIM-Cards are PIN-Code protected
Connection Types - GSM: CSD Circuit Switched Data
GPRS Connect Frequency User selectable:
- permanent connection
- connect from 1 x per minute to 1 x per day
Antenna Omnidirectional, +2dBi, TNC, waterproof
Power Supply Internal 6.2V battery, charged by solar panel or mains adaptor;
optional: non-rechargeable Lithium-Thionyl battery (to operate the RTU w/o solar panel)
Battery Panasonic High-Temperature Industrial Grade NiMH battery, 3100mAh
Type Approvals FCC, R&TTE, CE, Industry Canada, ACMA Australia


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