Modbus Rtu Cable Type

In modbus protocol one master communication with many devices approx 240 device.

Modbus rtu cable type.

Modbus is a data communications protocol originally published by modicon now schneider electric in 1979 for use with its programmable logic controllers plcs. 30 m in electrically quiet environments the type of cable used is usually not a concern but when you need to run long distances in noisy environments at higher baud rates the type of. Modbus cable interface quickly and easily with most existing plant control architectures by using belden cabling for modbus. One example of such cable is belden 3105a.

Go back to modbus rs485 cabling rules 5. Modbus protocol is a messaging structure developed by modicon in 1979 used to establish client server communication between intelligent devices. But any cable with similar characteristics can be used to connect all the devices together. Modbus has been a standard for interfacing remote i o and plcs into the process dlc system for over 20 years allowing most legacy control systems to interface easily with modbus.

Type of cable to use. Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices. The twin consists of two conductors that are twisted together. The cable to be used is a shielded twisted pair telephone type.

Modbus is popular in industrial environments because it is openly published and royalty free. With its open and simple specifications the modbus protocol is widely used to control device communications in industrial applications. The 3 most common modbus type used today. For modbus communications a shielded and twisted pair cable is used.

For example belden 3105a cable can be specified but different types of cable with equivalent characteristics can be used. Here describe a difference between modbus ascii vs modbus rtu vs modbus tcp ip below. As indicated in the following table modbus modes and functions differ depending on cable type. 1 modbus ascii 2 modbus rtu based on serial communication like rs485 rs422 rs232 3 modbus tcp ip based on ethernet.

The protocol interconnects field equipment such as sensors. Modbus rtu is an open serial rs 232 or rs 485 protocol based on master slave or client server architecture.