RSTAR Affinity Data Logger

The RSTAR Affinity data logger is a multi-sensor digital node that connects to different types of instruments with the innovative quick connect cable or conventional cable glands. Offering unprecedented modularity, scalability and flexibility, the RSTAR Affinity data logger is designed to be durable, quick to set up and versatile enough for any geotechnical monitoring application.


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Product Features

  • Five modules configurable for specific instrumentation signal types
  • Compartmentalized design makes maintenance simple
  • Self-locating via Bluetooth for easy set-up
  • Optional quick connect cable for faster instrument installations
  • IP67 rated to perform in -40˚C to 60˚C temperatures


The RSTAR Affinity data logger is designed to connect a variety of field analog and digital sensors to the RSTAR Affinity web-based dashboard. Each data logger can be configured to support up to five instruments of varying types.

Instrument and data logger configuration is mediated through secure and authenticated Bluetooth (BLE).

Instrument readings are communicated in real-time by low-power wide area network (LPWAN) through an RSTAR Affinity gateway. LPWAN protocols supported include LoRaWAN for long-range outdoor applications (up to 15 km).

Standalone data logging is supported by the synching of instrument data by local authenticated download in the RSTAR Affinity Field app.

RSTAR Affinity

Built by our team of seasoned instrumentation experts specifically for geotechnical monitoring projects, the RSTAR Affinity system comprises loggers, gateways, secure communications for data telemetry, and mobile and desktop applications. Forget the headaches of improvised monitoring solutions cobbled together from different third-party vendors. RSTAR Affinity represents your complete industrial internet of things (IIoT) solution for reliable, real-time data flow from your work site to your desktop—all from a single source.

RSTAR Affinity Data Logger Physical Specifications

Dimensions 159 mm (L) x 120 mm (W) x 87 mm (H) (enclosure only)

163 mm (L) x 185 mm (W) X 87 mm (H) (enclosure + wall

Total Mass 500 g to 550 g
Housing Material PBT
Ingress Protection Marking IP66 rated
Mounting Options Wall, pole, mounting kit available
Antenna Options External: +3 dBi and +5.8 dBi (N type connector)

Internal: ProAnt PRO-IS-573 PCB trace antenna


General Specifications

Temperature Operating Range From -40°C to 60°C
Temperature Operating Range From -40°C to 80°C
Lifespan 10-year service life.


USB Specifications

USB Power Requirements min 0.5 A @ 5 V from USB host
USB Cable Recommendations A to micro-B, shielded USB cable


BLE (Bluetooth Low Energy) Specifications

Bluetooth BT 5.0 single mode
Frequency 2.402 – 2.480 GHz
Antenna Internal
Raw Data Rates 125 kbps, 500 kbps, 1 Mbps, 2 Mbps
Maximum Transmit Power +8 dBm
Low Power Listen Mode Continuous


LORA (Long Range) Radio Specifications

Operating Regions LoRaWAN EU433 (Europe)
LoRaWAN EU868 (Europe)
LoRaWAN US915 (Americas)
LoRaWAN AU915 (Australia,Brazil)
LoRaWAN AS923-1/2/3/4 (Asia)
Protocols LoRaWAN® 1.0.1
Range Line of site: 7 km (min) / 15 km (max)

Urban environment: 2 km (min) / 5 km (max)


Power Specifications

Battery voltage 3.6V
Number of Cells 1 to 3 primary battery cells
Battery Cell Size D
Recommended Battery Cell Saft LSH20
Battery Nominal Capacity 13.0 Ah @ 20°C per cell


RS-485 Interface Specifications

Part ID IIM-RS-485
Supply Power 12 VDC up to 300 mA
Protocols Supported RS485
Serial Data Rate 9600 to 115200 Baud configurable through RSTAR Affinity digital suite.
Serial Port Half-duplex
Protection 1500 VDC isolation on the 12 V
3000 VDC isolation on TTL signals
Isolation ICs are EN62368-1 certified


Vibrating Wire Specifications

Vibrating Wire + Vibrating wire pair Part ID IIM-VW-VW
Vibrating Wire + Thermistor pair Part ID IIM-VW-TH
Excitation Voltage 5 V
Resonant Frequency Measurement Range 300 Hz to 7,000 Hz
Resonant Frequency Resolution 0.11 Hz (1 part in 65,000)
Resonant Frequency Accuracy ± 0.7 Hz (0.01% FS)
Protection Tran 1500 VDC isolation on the 5V
3000 VDC isolation on TTL signals
Isolation ICs are EN62368-1 certified
ESD protection to ±2KV silent protection for instrument ports


Thermistor Specifications

Vibrating Wire + Vibrating wire pair Part ID IIM-VW-VW
Vibrating Wire + Thermistor pair Part ID IIM-VW-TH
Measurement Range 0 Ohm to 196 mOhm
Measurement Resolution 0.183 Ohm
Accuracy ± 0.1°C
Protection 1500 VDC isolation on the 12 V
3000 VDC isolation on TTL signals
Isolation ICs are EN62368-1 certified

File Name

RSTAR Affinity Data Logger Brochure

Resource Type

Language Version Download

File Name

RST Affinity Data Logger Quick Start Guide

Resource Type

Quick Start Guide
Language Version Download

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd