DCP48 Python Programming Tutorial

Dr. Michael Heidinger
CEO, Digital Power Systems

Introduction

This tutorial provides a step-by-step guide to mass-programming the DCP48M DC/DC converter using a Modbus connection via a Windows PC with a USB-to-RS485 adapter.

Required Material

• DCP48M DC/DC converter
• Windows PC
• USB-to-RS485 adapter (recommended: Waveshare FTDI USB-to-RS485)

Hardware Wiring

Connect the RS-485 adapter terminals: A to A, B to B. RS-485 does not strictly require a ground connection, but if needed, use the "-" terminal from the power input.

Installing Python on Windows

1. Download the programming script (ZIP file)
2. Unzip the file, right-click to open a terminal in the folder
3. Install required libraries:

   python -m pip install pymodbus pyserial

4. Verify the installation:

   python -c "import pymodbus; print(pymodbus.__version__)"

5. Modify the COM port in the configuration section of the script
6. Execute the script:

   python modbus_massprogramming.py

Setting Up Parameters

In the script, uncomment the parameters you want to modify. Set ENABLE_SAVE_PARAMETERS = True to persist changes. The script also supports hardware control pin modification (PCB version 5 and later).