Modbus is an openly published communications protocol based on master/slave or client/server architecture, designed by Modicon for use with its programmable logic controllers (PLCs). Versions of the Modbus protocol exist for serial port and Ethernet. Modbus remote terminal unit (RTU) is a compact, binary representation of the data. Modbus ASCII is human readable, and more verbose. Both of these protocols are serial based. Modbus/TCP is very similar to Modbus RTU, but is transmitted within TCP/IP data packets.
Communication protocol developed by Modicon; widely used in SCADA and process control applications. Operating systems and PROMs containing the MODbus protocol are available for many Campbell Scientific dataloggers.
This protocol provides the internal standard that Modbus ready devices use for parsing messages. During communications on a Modbus network, the protocol determines how each device will know it's address, recognize a message addressed to it, determine the kind of action to be taken and extract any data or other information contained in the message. If a reply is required, the device will construct the reply message and send it using Modbus protocol.
An industrial networking system that uses RS-232 serial master-slave communications at data transfer rate of up to 19.2 KBPS.
Protocol used for communications between electronic devices developed by Gould Modicon.
A widely used software protocol by which diverse products may communite over a serial network.
Protocol originally developed by Modicon, now part of Schneider Automation.
Industry standard telemetry protocol.
An industrial networking system that uses peer-to-peer communications. Developed by Modicon
A protocol developed by Modicon in 1979 and used for communicating between hardware devices. Based on a master/slave architecture, it defines a common message structure for devices to use. Opto 22 products can interface with Modbus devices in several ways. Modbus Integration Kits integrate ioProject and FactoryFloor controllers with third-party Modbus devices. ioProject controllers can communicate with hardware and software using Modbus/TCP. SNAP Ethernet brains can also communicate using Modbus/TCP. The SNAP-B3000-MODBUS serial brain can communicate with a Modbus master.
An industrial networking system that uses peer-to-peer communications. More details on Modbus are in Issue 32 of Monitor.
Modbus is a serial communications protocol published by Modicon in 1979 for use with its programmable logic controllers (PLCs). It has become a de facto standard communications protocol in industry, and is now the most commonly available means of connecting industrial electronic devices.
