Gateway EG

The EG-200 is an open Linux gateway, with RS485 Modbus RTU, Modbus TCP and MQTT, HTTP & SNMP interfaces.

Contact us to learn more

Product details

Any Modbus device can be read from or written to via plugins, and all collected data is published to an onboard MQTT message broker as well as logged to uSD card. Live readings or aggregations (1/5/15/60 minutes) can be securely pushed to any third party cloud service of your choice, or pulled from the data logger, entirely on premises.

A simple plugin development kit, complete with an integrated onboard test environment, makes it easy to add support for new Modbus devices. Plugins already exist for all eTactica hardware, plus a wide variety of third party devices.

A complete Linux (OpenWrt) SDK is also provided for running your own scripts, third party packages or further customizing the firmware.

The EG-200 can also function in simple Modbus TCP/RTU bridge mode, connecting existing Modbus/RTU infrastructure via ethernet or wireless.

  • Compact size at 2 DIN rail units (34x86x60mm)
  • Device Bus: 9-24V DC
  • Ethernet / WiFi
  • Interface Protocol: Modbus RTU – 19200, 8, E, 1 (default settings)
  • Supports up to 32 Modbus devices
  • Extra data storage via a micro SD card
  • Built in webserver for device configuration and live measurements
  • Built in overload alerts for measured breakers/devices

Frequently Asked Questions

How many devices can be connected to a single EG-200?

You can connect up to 32 Modbus devices to a single EG-200. For example, you can connect 1 eTactica EM and 31 eTactica EB-312 and receive power measurements from 372 circuits.

Is it possible to connect third party to the EG-200?

Yes, the EG-200 can connect to any Modbus RTU/TCP device and includes plugins for almost 20 third-party devices out of the box. A plugin environment is provided for adding extra devices.

Does the EG-200 support the MQTT/MQTTS protocols?

Yes, the EG-200 supports both MQTT and MQTTS, and can be configured to send to multiple concurrent MQTT destinations.

How much space does EG-200 take inside an electrical cabinet?

The EG-200 takes 2 DIN rail units (34x86x60mm).

Can you store data on the EG-200?

With an SD card inserted, the EG-200 will buffer MQTT messages while offline. More extensive data storage options are under development and available as a prototype.

Is the set-up process difficult?

The set-up process is very simple. You can watch a demonstration video here

Cloud dashboard

Our software doesn’t require a dedicated installation with additional hardware for hosting, and there are no hidden costs or maintenance costs.

Gateway EG

The EG-200 is an open Linux gateway, with RS485 Modbus RTU, Modbus TCP and MQTT, HTTP & SNMP interfaces.

Power Meter EM

Use the Power Meter to measure branches up to 3000A, using a standard Modbus-RTU to provide voltage, current, power factor and frequency data for 1-3 phases, as well as temperature.

Power Bar EB

The EB is a compact AC current and power measurement device that enables accurate monitoring of every breaker of interest, without taking up any DIN-rail space.

Split Core CT

For use with EM power meters. Our Split Core CTs are available in three window sizes and rated from 80A to 500A.

Flexible Coils

The flexible coil current transformers are based on the Rogowski principle and have been designed for accurate, non-invasive measurement of AC current.


The premade Modbus cables by eTactica are designed to make it easier to set up Modbus devices that use Molex connectors.