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Siemens RDF302 Basic documentation CE1P3079en
Building Technologies About this document 07 Dec 20111
1.4 Target audience, prerequisites
Product & sales managers, distributors, re-sellers & OEM customers who use
RDF302 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 RDF302 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
RDF302 units are employed.
For reference documentation, see section 1.2.
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 is able to access data in one or more
connected MODBUS Slave
Modbus slave A MODBUS device, which is able to respond to requests from a
single MODBUS master
Pxx Parameters of the device where xx = 00, 01, 02, etc.
RDF Modbus The name of RDF302 providing RS485 Modbus communicative
RTU Remote Terminal Unit = Standard MODBUS transmission mode
The communication objects of the RDF302 thermostats are described accordingly.
A list of the parameters is shown in section 3.13.
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