Overview

This example runs a Modbus master protocol stack over TCP.

Behavior

The device communicates with Slave 1 (see modbus_slave example):

• Master writes DIP switch values to coils 0-7.
• Master writes the logical OR of DIP switch values to coil 8.
• Master reads input registers 0-1 and displays the result as text.
• Master writes holding register 0 with digital input values.
• Master reads discrete inputs 0-7 and applies them to digital outputs.
• Master reads discrete inputs 8-11 and uses them to control display LEDs.

Setup

The board is assigned static IP address 192.168.1.222.