Basic Documentation

About this document
Target audience, prerequisites
1
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A6V12114068_en--_c
1.3.3 Document user/request to the reader
Before using products from Siemens Industry, Inc., it is important that you read the
documents supplied with or ordered at the same time as the products (equipment,
applications, tools, and so on) carefully and in full.
We assume that persons using our products and documents are authorized and
trained appropriately and have the technical knowledge required to use our
products as intended.
More information on the products and applications is available:
● On the intranet (Siemens employees only) at
https://wse04.siemens.com/content/P0002723/SitePages/Home.aspx
● From the Siemens branch office near you
www.buildingtechnologies.siemens.com or from your system supplier
● From the support team at headquarters [e-mail]
if there is no local point of contact
Siemens assumes no liability to the extent allowed under the law for any losses
resulting from a failure to comply with the aforementioned points or for the
improper compliance of the same.
1.4 Target audience, prerequisites
Product & sales managers, distributors, re-sellers & OEM customers who use
RDF660MB... room thermostats in the RS485 Modbus RTU network.
Since Modbus protocol has been well known for years in the industry, this
document will explain the operations related to RDF660MB... Modbus units. e.g.
the unit setup, available settings and their applications. And users should have the
general knowledge of HVAC systems and local electrical installation regulations
where RDF660MB... units are employed.
For reference documentation, see Reference documents [➙ 5].
1.5 Glossary
The inputs, outputs and parameters of an application can be influenced in various
ways. These are identified by the following symbols in this document:
Term
Description
DTE
Data Terminal Equipment
Modbus
master
A Modbus device, which can access data in one or more
connected Modbus Slave
Modbus
slave
A Modbus device, which can respond to requests from a single
Modbus master
Pxx
Parameters of the device where xx = 00, 01, 02, etc.
RDF Modbus
The name of RDF660MB... providing RS485 Modbus
communicative
RTU
Remote Terminal Unit = Standard Modbus transmission mode
The communication objects of the RDF660MB... thermostats are described
accordingly.
For the list of the parameters, see Control parameters [➙ 53].