TBSL1/RFB-4GQJ-DC

Multi-sensors LTE RTU

TBSL1/RFB-4GQJ-DC is a rugged outdoor multi-sensors Remote Telemetry Unit (RTU) with integrated LTE communication designed for reliable remote data acquisition and telemetry. It supports multiple sensor types (SDI-12, analog, pulse) and uses standard IoT protocols (MQTT(S), HTTP(S), FTP(S)) to transmit sensor data over cellular networks. This DC-powered version (no internal battery) is ideal for installations with available external DC power, offering embedded data storage and operating in harsh outdoor environments.

Datasheet

Features

Key capabilities and advantages

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LTE cellular connectivity for wide-area telemetry.
Standard IoT data protocols: MQTT(S), HTTP(S), FTP(S).
Multi-sensor support (SDI-12, analog, pulse).
Flexible sensor input configuration.
PC configuration via USB-B interface.
Embedded flash memory for data retention during communication outages.
Real-time timekeeping via NTP support.
Designed for outdoor use with IP67 rugged enclosure.
External power operation for continuous field deployment.

Specification

Technical specifications and parameters

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Modem	LTE.
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	External DC power (6–18 V).
Idle current	400 µA.
Battery	None (DC-only model).
Power connectors	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 gasket. IP67 rating. TNC antenna connector. Gore-Tex vent. IP67 circular panel connector.