RS485 Modbus Gateway
Natively reads RS485 Modbus RTU and Modbus ASCII registers from connected devices — energy meters, sensors, PLCs — and relays data to MQTT or HTTPS endpoints on the cloud platform.
IoT Gateway
TRB145 RS485 IoT Gateway
A compact industrial 4G LTE gateway with RS485 Modbus RTU support — built to connect energy meters, sensors, and industrial devices to the cloud for real-time remote monitoring.
4G/3G/2G
RS485 Modbus RTU
-40°C to +75°C
DIN Rail Mount
Connectivity
4G LTE Cat 1
Interface
RS485
Connectivity
4G LTE Cat 1 3G / 2G fallback
Interface
RS485 Modbus RTU/ASCII
Input Voltage
9–30V DC
Operating Temp
-40 to +75 °C
Why it is useful
The link between your industrial sensors and the cloud
TRB145 takes RS485 Modbus data from energy meters, sensors, and industrial devices and transmits it to the cloud over 4G LTE — with no local server or wired network required.
4G LTE Cat 1 / 3G / 2G
Primary 4G LTE Cat 1 connectivity with automatic 3G and 2G fallback — keeps data flowing in areas with limited coverage, critical for remote industrial sites.
Industrial-Grade Reliability
Rated for -40°C to +75°C operation with 9–30V DC input — suitable for panel installation in DG rooms, electrical substations, and outdoor enclosures without additional power conditioning.
Use Cases
Where TRB145
Where TRB145
fits well
TRB145 is deployed wherever industrial RS485 devices need to send data to the cloud without a local server — from energy monitoring panels to genset rooms and remote sensor installations.
- Energy meter gateway — reads LG6400P Modbus registers (kWh, kW, V, A, PF) over RS485 and pushes data to the cloud dashboard.
- DG set and genset monitoring — connects to panel-mounted energy meters in generator rooms for real-time load, runtime, and fuel consumption visibility.
- Multi-meter deployments — multiple Modbus devices on a single RS485 bus, with TRB145 polling each meter address sequentially.
- Remote industrial sites — where wired LAN or Wi-Fi is unavailable, TRB145 provides cellular uplink for continuous data delivery to the cloud.
- Solar and renewable energy systems — monitoring inverter output, grid import/export, and generation data from Modbus-enabled inverters.
Features and Specifications
Product Specifications
TRB145 specifications relevant to energy monitoring and industrial IoT deployments.
Cellular
| Technology | 4G LTE Cat 1 / 3G / 2G |
| LTE speed | Up to 10 Mbps DL / 5 Mbps UL (Cat 1) |
| LTE bands (EU) | B1, B3, B7, B8, B20, B28 |
| 3G bands (EU) | B1, B8 |
| 2G bands (EU) | B3, B8 |
| SIM | 1× Mini SIM (2FF), 1.8V / 3V |
| Antenna | 1× SMA for LTE (external antenna) |
| Data protocols | MQTT, HTTPS, HTTP, TCP, UDP, SMS |
Cloud & Protocols
| IoT protocols | MQTT (broker publish), HTTPS POST |
| Modbus mode | Modbus TCP client, TCP server, RTU server, RTU gateway, Modbus over MQTT |
| Data collection | Configurable polling interval per register group |
| Remote management | RMS (Teltonika Remote Management System) |
| Firmware update | OTA (over-the-air) via RMS or HTTPS |
| IoT integration | Pushes Modbus register data to cloud platform via MQTT/HTTPS |
RS485 Interface
| Type | RS485 — 2-wire or 4-wire interface |
| Protocol | Modbus RTU / Modbus ASCII (server & client), DNP3 |
| Connector | 6-pin terminal block (screw type) |
I/O & Other Interfaces
| Digital I/O | 2× configurable I/O — input: 0–5V low / 8–30V high; output: open collector, max 30V 300mA |
| USB | 1× Micro USB (virtual network interface) |
| LED indicators | 3× connection type, 5× signal strength, 1× power |
| Reset | Reboot / user default / factory reset button |
Physical
| Dimensions (W × H × D) | 74.5 × 25 × 64.4 mm |
| Weight | 130 g |
| Housing | Aluminium, IP30 |
| Mounting | DIN rail, wall mount, flat surface (additional kit required) |
| Power connector | 4-pin industrial DC power socket |
| RS485 connector | 6-pin terminal block |
Power & Environment
| Input voltage | 9–30V DC (reverse polarity & surge protection) |
| Power consumption | < 5W |
| CPU | ARM Cortex-A7, 1.2 GHz |
| RAM | 128 MB DDR2 |
| Flash storage | 512 MB SPI Flash |
| Operating temp | -40°C to +75°C |
| Humidity | 10–90% non-condensing |
| Certifications | CE, UKCA, EAC, RoHS, REACH, RCM, E-mark, MTCTE |
Platform Integration
TRB145 as the cellular bridge for energy monitoring
TRB145 sits between LG6400P energy meters and the cloud dashboard — enabling real-time kWh tracking, demand alerts, and multi-panel visibility from a single gateway.
- Polls LG6400P energy meters over RS485 Modbus RTU — collecting kWh, kW, voltage, current, and PF registers on a configurable interval.
- Transmits data via MQTT or HTTPS over 4G LTE to the cloud dashboard — no local server or wired network needed.
- Remote firmware updates and configuration changes via Teltonika RMS — no physical site visit required for parameter adjustments.
FAQ
Common questions about TRB145
TRB145 acts as the cellular IoT gateway between RS485 Modbus devices — primarily LG6400P energy meters — and the cloud dashboard. It polls Modbus registers from connected meters and transmits the data (kWh, kW, voltage, current, PF) via MQTT or HTTPS over 4G LTE.
A single TRB145 can poll multiple Modbus devices sequentially on one RS485 bus, making it practical for monitoring multiple feeders, distribution panels, or DG sets from one gateway — reducing hardware cost and SIM overhead on multi-panel sites.
Yes. TRB145 uses 4G LTE Cat 1 as its primary uplink with automatic 2G fallback — no LAN, Wi-Fi, or local server is required. This makes it suitable for electrical panels in generator rooms, substations, remote site offices, and any location with cellular coverage.
TRB145 accepts 9–30V DC input, consuming approximately 3W typically (5W max). It can be powered directly from a DG control panel auxiliary supply, a 12V or 24V DC bus, or a dedicated DIN rail power supply unit — all common in industrial panel environments.
Yes. TRB145 supports Teltonika RMS (Remote Management System) for OTA firmware updates, configuration changes, and device monitoring without a site visit. Polling intervals, register maps, and MQTT endpoints can also be reconfigured remotely — useful when adding meters to an existing bus.
Ready to connect your energy meters to the cloud?
Share your panel count, site layout, and energy monitoring goals. Aether will design the TRB145 + LG6400P gateway solution and connect it to the energy monitoring platform.