TBSL1/RFB-4GQJ

Multi-sensors LTE RTU

TBSL1/RFB-4GQJ is a versatile outdoor multi-sensors Remote Telemetry Unit (RTU) with integrated LTE communication designed for reliable remote data collection. It supports multiple sensor types (SDI-12, analog, pulse) and uses standard IoT protocols (MQTT(S), HTTP(S), FTP(S)) to transmit data over cellular networks. The unit includes internal measurement storage and supports external solar power with battery backup, making it ideal for remote monitoring in environments with solar availability.

Datasheet

Features

Key capabilities and advantages

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LTE communication for wide-area cellular connectivity.
Standard IoT communication protocols: MQTT(S), HTTP(S), FTP(S).
Supports multiple sensor types (SDI-12, analog, pulse).
Configurable sensor measurement and reporting intervals.
Internal flash memory for data retention during communication outages.
PC configuration via USB-B interface.
Real-time clock synchronization via NTP.
Solar powered operation with battery backup for remote deployments.
Rugged outdoor design with IP67 waterproof housing.

Specification

Technical specifications and parameters

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Modem	LTE (single mode)
Frequencies	LTE-FDD: B1 / B3 / B8 / B18 / B19 / B26 (Japan only). Communication protocols: MQTT(S) / HTTP(S) / FTP(S). Supported sensor types: Multi (SDI-12 / Analog / Pulse).
SDI-12	v1.4.
Analog inputs	2 × configurable inputs (voltage: 0–2.5 V, current: 4–20 mA).
Pulse input	1 × 0–3 V input, max 1 Hz.
Connectors	2 × LLT-M14BMC07 (SDI-12 / analog / pulse signals multiplexed).
Power supply	Rechargeable battery and external solar panel.
Solar panel	MPP voltage 5 V and 2–5 W.
Idle current	400 µA.
Battery	1 × 3.7 V Li-Ion or Li-Po with safety PCB and 10k NTC.
Battery connector	JST B3B-XH-A (LF)(SN).
Solar panel connector	1 × LLT M14BMC05.
Configuration interface	USB.
Configuration port	USB-B.
Measurement storage	128 Mbits embedded flash.
Real-time retained	Yes.
Real-time synchronization	Connection to NTP server.
Housing	IP67 aluminium housing. SP-AG-FA3-1 family. Single piece gasketIP67 rating. TNC antenna connector. Gore-Tex vent. IP67 circular panel connector.