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GLOSSARY
MODBUS RTU
An open protocol for the serial communications developed by Modicon Inc. (AEG Schneider Automation
International S.A.S.). Simple and robust, it has since become a de facto standard communication protocol.
For more info http://www.modbus.org/specs.php
MODBUS TCP-IP
The Modbus RTU protocol with a TCP interface that runs on Ethernet.
For more info http://www.modbus.org/specs.php
MODBUS ASCII
A variant of the Modbus RTU protocol that makes use of ASCII characters for protocol communication.
MODBUS ETHERNET TO SERIAL
A device that translates, in real time, from Modbus TCP-IP ethernet protocol to Modbus RTU/ASCII serial
protocol.
MODBUS SERIAL TO ETHERNET
A device that translates, in real time, from Modbus RTU/ASCII serial protocol to Modbus TCP-IP ethernet
protocol.
MODBUS RTU/ASCII MASTER-SLAVE
The Master is connected with one or more slaves, the slave waits for an incoming register(s) request from the
master. In a serial modbus bus only one master is allowed.
MODBUS TCP-IP CLIENT-SERVER
The Client (called Master in Modbus RTU/ASCII) establishes a connection with the Server (called Slave in
Modbus RTU/ASCII). The Server waits for an incoming connection from the Client. Once a connection is
established, the Server then responds to the registers queries from the Client.
WEBSERVER
A software that store, process and deliver web pages to clients. Clients web can be PCs, Smartphones,
Tablets with a browser (Chrome, Internet Explorer, Firefox etc…).
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