Modbus Rtu Cable Type

As indicated in the following table modbus modes and functions differ depending on cable type.

Modbus rtu cable type.

But any cable with similar characteristics can be used to connect all the devices together. With its open and simple specifications the modbus protocol is widely used to control device communications in industrial applications. For example belden 3105a cable can be specified but different types of cable with equivalent characteristics can be used. Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices.

In modbus protocol one master communication with many devices approx 240 device. One example of such cable is belden 3105a. 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. Go back to modbus rs485 cabling rules 5.

1 modbus ascii 2 modbus rtu based on serial communication like rs485 rs422 rs232 3 modbus tcp ip based on ethernet. Here describe a difference between modbus ascii vs modbus rtu vs modbus tcp ip below. Modbus is popular in industrial environments because it is openly published and royalty free. Type of cables to use.

The wattnode bacnet and modbus meters communicate using rs 485 tia eia 485 a half duplex differential signaling at 9600 19200 38400 and 76 800 baud. Modbus cable interface quickly and easily with most existing plant control architectures by using belden cabling for modbus. Type of cable to use. Over short distances 100 ft.

Modbus is a data communications protocol originally published by modicon now schneider electric in 1979 for use with its programmable logic controllers plcs. The cable to be used is a shielded twisted pair telephone type. The 3 most common modbus type used today. The twin consists of two conductors that are twisted together.

For modbus communications a shielded and twisted pair cable is used. The protocol interconnects field equipment such as sensors.