Introduction
1
1.1 Purpose of the Operating Instructions
Purpose
The Operating Instructions provide all information necessary for the installation and use of the
Modbus RTU add-on module (FDK-085U0234), intended for use with the Siemens Flow
Instruments USM-II family of transmitters presently including SITRANS FM MAG 6000 and
SITRANS FC MASS 6000.
Basic knowledge required
The instructions are not intended to be a complete tutorial on the Modbus RTU protocol, and it
is assumed the end user already has a general working knowledge of Modbus RTU
communication, especially in respect of master station conguration and operation. However
an overview is included in the following section to explain some fundamental aspects of the
protocol.
See also
For more information about SITRANS FC and SITRANS FM transmitters and sensors, please refer
to the appropriate Operating Instructions available on the owdocumentation homepage
(
http://www.siemens.com/owdocumentation) or on the SITRANS F literature CD-ROM.
1.2 Document history
The contents of these instructions are regularly reviewed and corrections are included in
subsequent editions. We welcome all suggestions for improvement.
The following table shows the most important changes in the documentation compared to each
previous edition.
Edition Remarks
03/2021 Changes to the available customer units for MAG 6000
06/2010 Revision 04: Contents restructured
1.3 Modbus RTU technology
Modbus RTU is an open, serial (RS-232 or RS-485) protocol based on master/slave or client/server
architecture. The protocol interconnects eld equipment such as sensors, actuators, and
controllers and is widely used in both process and manufacturing automation. The eldbus
environment is the base level group of digital networks in the hierarchy of plant networks.
Modbus RTU RS 485
Operating Instructions, 03/2021, A5E00753974-AB 5
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