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Hardware Installation

Configuring The Heidelberg Wallbox

Disconnect the wallbox from the power supply.
Open the housing.
Set DIP switch S4 pin 4 to 1 (this sets the Modbus ID to 1).
Set DIP switch S6 pin 2 to 1 (this enables the 120 Ohm termination).

Connecting the Hardware Components

The hardware connections are very simple:

ESP32's GND to MAX485-board GND
ESP32's 3.3 V to MAX485-board VCC
ESP32 pin 18 to MAX485-board RO pin
ESP32 pin 19 to MAX485-board DI pin
ESP32 pin 21 to MAX485-board DE+RE pins
MAX485-board A terminal to Heidelberg wallbox A terminal
MAX485-board B terminal to Heidelberg wallbox B terminal