#ARDUINO MODBUS RTU SLAVE EXAMPLE CODE#
In order to ensure the same code is compatible in both platforms (Arduino and Raspberry Pi) we use the ArduPi libraries which allows developers to use the same code. This library offers an simple-to-use open source system. The Modbus protocol counts with a C++ library that lets you manage the Modbus functions in a simple way. If a difference is detected, the slave will not construct a response to the master.
The checksum is re-calculated by the slave and compared to the value sent by the master.
Modbus RTU is the most common implementation available for Modbus. The RTU format follows the commands/data with a cyclic redundancy check checksum as an error check mechanism to ensure the reliability of data.
#ARDUINO MODBUS RTU SLAVE EXAMPLE SERIAL#
This mode is used in serial communication and makes use of a compact, binary representation of the data for protocol communication. Modbus for Arduino/RaspberryPi/Galileo uses RTU mode of transmission. This list includes some of the most common uses of the standard: Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.
Modbus allows communication between many devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer.