TBSL1/RFB-4GWW

Multi-sensors LTE RTU

The TBSL1/RFB-4GWW is a rugged outdoor multi-sensor Remote Telemetry Unit (RTU) equipped with a global triple-mode GSM/WCDMA/LTE cellular modem for wide-area connectivity. It serves as a flexible wireless data bridge for environmental and industrial IoT applications by supporting multiple sensor types (SDI-12, analog, pulse) and transmitting collected measurements to a remote server using cellular networks. The unit includes internal storage and configurable settings for measurement and transmission behavior, making it suitable for reliable remote monitoring where long-range cellular coverage is available.

Datasheet

Features

Key capabilities and advantages

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Supports multiple sensor types in a single RTU.
Simultaneous SDI-12, analog, and pulse sensor connectivity.
Embedded data storage for measurement retention.
Real-time retained data: Yes.
Real-time synchronization: Connection to NTP server.
Designed for outdoor and harsh environments.
Compatible with solar-powered remote installations.

Specification

Technical specifications and parameters

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Modem	Triple mode LTE / WCDMA / GSM.
Frequencies
GSM	850 / 900 / 1800 / 1900 MHz. WCDMA: B1 / B2 / B4 / B5 / B6 / B8 / B19. LTE-FDD: B1 / B2 / B3 / B4 / B5 / B7 / B8 / B12 / B13 / B18 / B19 / B20 / B25 / B26 / B28. LTE-TDD: B38 / B39 / B40 / B41.
Communication protocols	MQTT(S), HTTP(S), FTP(S).
Supported sensor types	Multi.
SDI-12	v1.4.
Analog inputs	2 × configurable inputs/Voltage: 0–2.5 /Current: 4–20 mA.
Pulse input	1 × 0–3 V.
Max frequency	1 Hz.
Connectors	2 × LLT-M14BMC07 (SDI-12 / analog / pulse multiplexed).
Power supply	Rechargeable battery & external solar panel.
Solar panel MPP voltage	5 V, 2–5 W.
Idle current	400 µA.
Battery type	1 × 3.7 V Li-Ion or Li-Po with safety PCB & 10k NTC.
Battery	JST B3B-XH-A (LF)(SN).
Solar panel	LLT-M14BMC05.
Configuration interface	USB.
Configuration port	USB-B.
Measurement storage	128 Mbits embedded flash.
Housing	IP67 aluminium housing.
Operating enclosure	SP-AG-FA3-1 family, Single piece gasket, TNC antenna connector, Gore-Tex vent, IP67 circular panel connector.