TBSL1/RFB-4GWW-DC

Multi-sensors LTE RTU

TBSL1/RFB-4GWW-DC is a rugged outdoor Remote Telemetry Unit (RTU) designed for remote sensor monitoring over wide-area cellular networks. It integrates a triple-mode LTE/WCDMA/GSM modem to communicate sensor data to remote servers using standard IoT protocols such as MQTT(S), HTTP(S), and FTP(S). This model is the DC-powered version and supports a variety of environmental sensors (SDI-12, analog, pulse) with flexible scheduling and built-in storage for reliable data transmission in field deployments.

Datasheet

Features

Key capabilities and advantages

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Triple-mode cellular connectivity (LTE / WCDMA / GSM).
Supports standard IoT protocols (MQTT(S), HTTP(S), FTP(S)).
Compatible with SDI-12, analog, and pulse sensors.
Flexible sensor input configurations.
PC configuration via USB-B interface.
Embedded flash memory for data retention during outages.
Real-time clock synchronization via NTP.
Designed for rugged outdoor use (IP67 waterproof housing).
Ideal for remote monitoring and telemetry deployments.

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 / Analog / Pulse).
SDI-12	v1.4.
Analog inputs	2 × configurable (0–2.5 V, 4–20 mA).
Pulse input	1 × 0–3 V input, max 1 Hz.
Connectors	2 × LLT-M14BMC07 (SDI-12 / analog / pulse multiplexed).
Power supply	External power (6–18 V DC).
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.