Modbus Rtu Software Free MODBUS ASCII/RTU master and slave simulation plugin operates as a MODBUSmaster or slave device in either RTU or ASCII transmission modes. The plugin may be used to access and modify data points contained in one or more MODBUS slave devices. File Name:MODBUS ASCII/RTU master andslave simulation. Witte Software products. Modbus Poll is the very popular Modbus master simulator for test and debug of your slave devices. Supports Modbus RTU/ASCII and Modbus TCP/IP. New version 9 with Real time Charting. This utility supports Modbus RTU using both RS232/485 and Ethernet. I included pseudo protocols as well, such as Modbus UDP, RTU Over UDP and RTU Over TCP. Other features include Byte Swapping, Multiple Writes with a single click and Floating Point Values.
What is Modbus?
Modbus is an open serial protocol derived from the Master / Slave architecture originally developed by Modicon now Schneider Electric.
It is a serial level protocol widely accepted for its ease of use and reliability.
Nowadays, the variant for IP networks is also widespread, called ModBus TCP in which the protocol information is encapsulated within the TCP / IPModbus package and is widely used within BMS (Building Management Systems) and industrial systems IAS (Industrial Automation Systems).
Simplicity is the reason why Modbus is so popular. The fact that it was developed by one of the largest PLC manufacturers at the time and made it open and widely available.
Modbus requires very few resources for its implementation and this factor has also contributed a lot to its diffusion when the processors were still using 8-bit technology and resources such as RAM and ROM were extremely expensive and scarce.
Message checking is another reason why Modbus has been so popular. CRC and LRC control means that transmission errors are checked with 99% accuracy.