User Manual

System overview
Communication principles
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Client/Server
A BACnet device can assume two different roles within a system, the role as a server and the role as a
client. These roles are defined as follows:
● Client: A system or device which uses another device via a BACnet service (service request) for a
specific purpose. The client (e.g., Desigo CC, operator unit) requests a service from a server.
● Server: A system or device which responds to a given service request. The server (e.g., PXC automation
station, Desigo room automation station) performs a service for a client.
Most system devices in Desigo can act either as a client or as a server, but they normally each carry out
their more typical role. An automation station is normally a BACnet server, which supplies process data to
other system devices. The automation station can also act as a client, when it, e.g., subscribes to a process
value from another automation station.
BACnet standard device profile
The BACnet standard defines several device profiles that simplify to judge (and test) a device's capabilities
against a specified function set. Desigo always tries to work with such profiles and prove their fulfillment
by independent test laboratories and respective BTL logos and BACnet certificates.
● The PXC3 and DXR2 room automation stations comply with the B-ASC standard device profile.
● The PXC automation stations comply with the B-BC standard device profile.
● The Desigo CC management platform complies with the B-AWS standard device profile.
For a complete list with additional details, see BACnet Protocol Implementation Conformance Statement
(PICS)
(CM110665) and the products page of the BIG-EU website (www.big-eu.org).
AMEV guideline
Desigo complies with the AMEV guideline BACnet 2011 Version 1.2 with the following profiles:
BACnet server BACnet client
D-MAP program
Application
process
(Visualisation)
Process and
configuration
data
BACnet objects
BACnet protocol
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