Introduction to Modbus
Modbus protocol is a master-slave communications Industrial architecture (RTU), created to be implemented Modicon PLCs.
Why use this protocol and consider that it is better than other industrial protocols, implementation is easy and simple network configuration dropping down is defined (RTU) by way compact binary data concerning the device connection with a PC supervisory computer with a remote unit (RTU) RTU Modbus variations exist which apply and ASCII version which I consider less efficient in handling and size of records.
1 1 ESP8266
2 1 Converter FTDI Serial USB
3 1 Regulator de 5 a 3.3v for supply ESP8266