Modbus gateway ESP8266 NodeMCU V3 + RS485
Description
Modbus gateway consists of ESP8266 (NodeMCU v3) and RS485 (3.3V). It is based from https://www.thingiverse.com/thing:4921700 with additional spaces for soldering on TX, RX, 3.3V, GND pins. Plug to modbus device is depends of your device. Connection A+ and B- are mandatory, but VCC 5V and GND are optional. Depends of how you want to power ESP by USB or by 5V from Modbus plug.
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