Modbus is an open protocol, meaning that it's free for manufacturers to build into their equipment without having to pay royalties. The official Modbus specification can be found at The M aster can also write information to the Slaves. In a standard Modbus network, there is one Master and up to 247 Slaves, each with a unique Slave Address from 1 to 247. The device requesting the information is called the Modbus Master and the devices supplying information are Modbus Slaves. In simple terms, it is a method used for transmitting information over serial lines between electronic d evices. Modbus is a serial communication protocol developed by Modicon published by ModiconĀ® in 1979 for use with its programmable logic controllers (PLCs). This document describes how modbus works and what needs to be done for proper installation.
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