Modbus is a serial communication protocol that was developed by Modicon. It is a method used for transmitting information over serial lines between electronic devices. Modbus master is the device that requests information and the devices supplying information are known as Modbus Slaves. It is free for manufacturers to build into their equipment without having to pay royalties. Modbus cables have now become the most commonly available means of connecting industrial electronic devices and is widely used.
Uses of Modbus Cable
- It is used to transmit signals from instrumentation and control devices back to the main controller or data gathering system.
- It is used to connect a supervisory computer with a remote terminal unit in supervisory control and data acquisition systems.
How do Modbus Cable works?
Modbus is transmitted over serial lines between devices. A single serial cable connecting the serial ports on two devices, a Master and a Slave can be the simplest setup connection. Data is sent as bits and each bit is sent as a voltage.
3. Main Rules that must be followed for the cabling of Modbus Cables:
- Connection port
- The connection between the devices
- Maximum distance and maximum number of devices
- Use of repeaters
- Type of cable to use
- Connecting to the terminals
- Earth connection of the shield
- Termination resistance
- Connection to a personal computer.
4. Modbus Map
A Modbus map is a list for an individual slave device that defines what the data is, where the data is stored and how the data is stored. Some devices are built with a fixed map that is defined by the manufacturer while other devices allow the operator to configure or program a custom map to fit in their needs. Cables marking would become much more easier and simpler with the launch of Modbus Cables.
5. What is Enron Modbus?
Enron Modbus is a modification to the standard Modicon Modbus communication protocol. This is developed by Enron Corporation. It generally includes commands for moving events and historical data.
In short, Modbus cable developed by Modicon, provides communication between intelligent automation devices. It is one of the best cables for industrial applications.
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