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DSE Modbus Simulator

This repository contains a Python script simulating the Modbus TCP server of a generator equipped with a DSE 4620 controller + DSE 855 "USB to Ethernet Communications Device".

Features

Modbus:

  • Telemetry Start/Stop
  • Setting into Remote start mode
  • Power production value simulation (randomized)
  • Alerts

Web interface:

  • Read and set register values
  • Set via web interface

DSE Modbus Simulator Web Interface

Get started

Follow these steps to run the simulator on your machine:

# Install virtualenv
pip3 install virtualenv

# Create venv
python3 -m venv venv

# Activate venv
source venv/bin/activate

# Install dependencies
pip install -r requirements.txt

# Run Webserver at http://localhost:8000 and Modbus server on 0.0.0.0:502
python3 main.py

After that, you can enter your machine's IP address on the GX device at Settings > Modbus TCP/UDP devices > Saved Devices via the Add button. Use TCP, port 502 and unit id 1. After that, the simulated generator should show up in the Device list.

Helper relay mode

Some DSE controllers, esp. the DSE 4520 MKII model, do not support starting and stopping via Modbus. This can also be simulated using -hr flag, by which the controller does not advertise the capability of being remotely started or stopped via Modbus. If the dbus Python dependency is available, it will watch for the value of the /Relay/0/State path of com.victronenergy.system and trigger a start or stop of the simulated genset based on its value change, simultating the physical controller start/stop IO input to be wired to Relay 1 of a GX device.