Crestron Cresnet Network Guida
Cresnet® Network
Design Guide
Crestron Electronics, Inc.
Original Instructions
The U.S. English version of this document is the original instructions.
All other languages are a translation of the original instructions.
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Contents
Overview 1
Cresnet Device Definitions 2
Control Systems 2
Cresnet Servers 2
Cresnet Clients 2
Network Architecture 3
Maximum Network Size 3
Network Topologies 3
Home-Run Topology 3
Daisy-Chain Topology 3
Star-Network Topology 4
Cresnet ID Assignment 4
Client Device Distribution 6
Cresnet Distribution Blocks 6
Cresnet Distribution Block 6
Multitype Cresnet Distribution Block 7
DINRail Cresnet Distribution Block 8
Cresnet Hubs 9
Cresnet Hub 9
Din Rail Cresnet Hub 10
Ethernet-to-Cresnet Bridging 11
Ethernet-to-Cresnet Bridge with PoE 11
Ethernet-to-Cresnet Bridge for CAENAutomation Enclosures 12
Wiring and Connectors 14
Overview 14
Supported Cresnet Cables 15
Non-Plenum Cables 15
Plenum-Rated Cables 16
High-Power Cables 16
Data-Only Cables 17
Terminate Cresnet Wiring to a Connector 17
Best Practices 18
Power Requirements 20
Cresnet Power Calculator 20
Calculate Power Requirements for Wire Runs 21
Design Guide — Doc. 9292A Contents • iii
Design Guide — Doc. 9292A Cresnet® Network • 1
Overview
The Cresnet™ communications protocol is designed for Crestron devices that do not require the
higher speeds of Ethernet. Cresnet provides a dependable and flexible wiring solution, allowing
multiple devices to be wired together in parallel using various network topologies. Asingle
Cresnet server can provide power and data to up to 25 client devices. Cresnet networks can be
further expanded using Cresnet hubs and Ethernet-to-Cresnet bridges.
This design guide provides the following information that can be referenced when designing a
Cresnet network system:
lOverview of Cresnet server and client devices
lOverview of Cresnet architecture
lCresnet device distribution options
lEthernet-to-Cresnet bridging options
lCresnet wiring and connector options and best practices
lCresnet power considerations
lCommon troubleshooting scenarios
2 • Cresnet® Network Design Guide — Doc. 9292A
Cresnet Device Definitions
A Cresnet network consists of three primary device categories:control systems, Cresnet servers
(masters) and Cresnet clients (slaves).
Control Systems
A control system supplies data to a combination of Cresnet clients, Cresnet distribution blocks,
or Cresnet hubs via its NET (Cresnet)port. Ethernet-to-Cresnet bridges can be added to a
Crestron control system to expand the size of the Cresnet network, creating isolated Cresnet
subnets that each behave as a Cresnet server with its own unique address space.
Certain Crestron control systems and Ethernet-to-Cresnet bridges also supply 24VDCpower to
Cresnet clients.
Cresnet Servers
A Cresnet server is a connection to a control system that allows a control system program to
communicate with Cresnet clients. A Cresnet server supplies power and data to Cresnet clients
via its built-in Cresnet bus. The Cresnet bus distributes bidirectional data communication and
24VDC power to each wired client device over a single 4-conductor cable.
Cresnet Clients
A Cresnet client receives its power and data from a Cresnet server either directly (wired to the
Cresnet server)or indirectly (wired to a Cresnet distribution block or hub or daisy-chained to
another Cresnet client). Cresnet clients each have their own specific power draw requirements
that must be taken into consideration when designing the Cresnet network.
Examples of Cresnet clients include keypads, lighting controls, shade motors, thermostats, and
occupancy sensors.
Design Guide — Doc. 9292A Cresnet® Network • 3
Network Architecture
The following sections provide information about the Cresnet network architecture that should
be taken into consideration when designing a Cresnet network.
Maximum Network Size
The maximum size of a Cresnet network is dependent on the system design:
lA single Cresnet server supports up to 25 client devices with a maximum aggregate cable
length of 1,500ft (457m).
lACresnet network can be expanded to contain up to 90 client devices using Cresnet hubs.
Cresnet hubs also allow for longer cable runs. For more information, refer to Cresnet Hubs
(on page9).
lACresnet network can be further expanded to contain over 90 client devices using
Ethernet-to-Cresnet bridges. For more information, refer to Ethernet-to-Cresnet Bridging
(on page11).
Network Topologies
Cresnet network systems can be designed using any of the following network topologies. A
topology should be chosen that best suits the needs of the particular Cresnet installation or
space.
Home-Run Topology
For home-run topologies, wiring is run from the Cresnet server to a single Cresnet client.
Adistribution block is typically used in home-run topologies to allow the Cresnet server to
provide power and data to multiple Cresnet clients from one central location in the room. For
more information, refer to Cresnet Distribution Blocks (on page6).
Daisy-Chain Topology
For daisy-chain topologies, wiring is run from the Cresnet server to a Cresnet client. For
subsequent Cresnet clients, wiring is either run from a second port on the prior Cresnet client, or
wires are doubled in the connector. This daisy chain can continue for up to 25 client devices or a
for total run of 1,500ft (457m).
4 • Cresnet® Network Design Guide — Doc. 9292A
Star-Network Topology
For star-network topologies, wiring is run from the Cresnet server to a Cresnet hub. Cresnet
clients are then branched off from the central hub. This topology is commonly used when a
Cresnet wiring run needs to be taken into a different room. A distribution block connected to the
hub can then be used to route power and data to Cresnet clients in the room. Several Cresnet
hubs can be used to distribute power and data to multiple distribution blocks that all branch off
from a single Cresnet server.
CAUTION:When designing a Cresnet network using the star-network topology, the design
must ensure that no loops are created within the system. All runs from the Cresnet server
must connect to Cresnet clients or hubs only. Awiring run must never return to the Cresnet
server.
Cresnet ID Assignment
Cresnet IDs (NETIDs)are unique identifiers given to Cresnet devices on a network (similar to
IPIDs) that allow for network communication between Cresnet clients and servers. NET IDs
should be assigned using the Network Device Tree View tool in Crestron Toolbox™ software. For
more information, refer to the Crestron Toolbox help file.
Some devices ship with default Cresnet IDs other than 03 or 01 to help streamline some
packaged systems or to facilitate adjustments by certain software wizard systems. For a partial
list of default Cresnet IDs, refer to Crestron Online Help article 1001590.
NOTE:Cresnet servers always have a NET IDof 02. Valid NET IDs for Cresnet clients are
03through FE(03 through 254 decimal).
Refer to the following best practices when assigning NETIDs:
lEnsure no duplicate NETIDs are assigned to Cresnet clients on a Cresnet network. Using
the Network Device Tree View tool in Crestron Toolbox software to assign NETIDs is
recommended to avoid duplicate IDs.
lNo more than 90 client devices should be present on a Cresnet network.
Design Guide — Doc. 9292A Cresnet® Network • 5
lCrestron recommends grouping NETIDs so that similar products on a Cresnet network
are grouped together within a NETIDrange. The following example shows how various
product types could be grouped using NETIDs:
NOTE:Grouping Cresnet IDs helps organizations to group Cresnet devices to align
with various organizational standards. There are no electrical or communication
advantages to grouping Cresnet IDs.
oThermostats:10 through 1F
oKeypads:20 through 4F
oTouch screens:50 through 6F
oLighting controls:70 through 9F
oOther products:A0 through BF
6 • Cresnet® Network Design Guide — Doc. 9292A
Client Device Distribution
ACresnet network system with a single Cresnet server can provide power and data to up to 25
client devices with a maximum cumulative wiring run of 1,500ft (457m). Cresnet networks can
be expanded via Cresnet distribution blocks and Cresnet hubs. Each device type and supported
models are described in the following sections.
Cresnet Distribution Blocks
Cresnet distribution blocks allow for multiple Cresnet wiring runs to be terminated to one central
location within a room. The Cresnet distribution block is connected to the Cresnet server and
distributes power and data from the server to all connected clients. Cresnet distribution blocks
are commonly used in home-run network topologies, but can also be used to power client devices
off of a central Cresnet hub.
The following Cresnet distribution blocks are available.
Cresnet Distribution Block
The CNTBLOCK is a parallel distribution block designed to facilitate the termination of multiple
Cresnet wiring runs in an equipment cabinet, closet, or beneath a table.
CNTBLOCK Cresnet Distribution Block
lDiagnostic LEDs indicate the presence of network power and data.
lEight 4-pin detachable black (5mm) terminal blocks are provided, grouped in two sets of
four.
lPower can be isolated between the two sets by removing an internal jumper.
lIncludes an integral mounting flange for mounting to a flat surface.
Indice
Altri manuali Crestron Unità di distribuzione dell'energia
