DURAG D-R 290, Operating Manual

Page: 110 / 202

6 | Commissioning
110 D-R 290
Information on the DURAG Modbus protocol
This information is intended for operating and maintenance personnel who already
have the necessary basic information technology and networking knowledge:
●
The Modbus protocol is a communications protocol. Since 1979, because of its
open structure, Modbus has become a de facto standard in the industry.
●
The data are transmitted in binary form. This form of the Modbus is designated as
RTU.
●
The DURAG Modbus is based on the Modbus protocol, and also defines
additional
information, such as register assignments.
●
The D‑ISC 100 uses a RS-485 serial interface [
}
196] to the DURAG Modbus
specification.
We have summarised in the appendix the most important technical data that you re­
quire for the D‑ISC 100 - Universal control unit in relation to the Modbus (see Setting
the addresses (slave addresses)).
Basic Modbus information
Basic information about the Modbus RTU [
}
195] Modbus can be obtained from the
Internet at the home page of the Modbus Independent User Organisation (IDA)*.
●
"Modbus Protocol specifications"
http://www.modbus.org/docs/Modbus_Application_Proto­
col_V1_1b.pdf
(Describes the datagrams (protocol data units) that are exchanged between master
and slave).
●
"Modbus over Serial Line Specification and Implementation Guide"
http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
(Describes how the datagrams are packed into telegrams (application data units)).
The specifications of the cables to be used for operating the Modbus can be found on
the Internet under the address*
●
http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
in the Chapter 3.6 Cables.
●
http://modbus.org/docs/Modbus_Messaging_Implementa­
tion_Guide_V1_0b.pdf
Information on using Modbus TCP.
*(DURAG GmbH offers no guarantee of the correctness of the Internet addresses.
DURAG GmbH offers no guarantee of the correctness of the pages listed. The pre­
senters of those pages take sole responsibility for them).
Example: Save parameters
6.4
6.4.1
6.5
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