Communications between Crestron Cresnet devices occurs on the Cresnet bus. Cresnet is Crestron's proprietary 4-wire communications network that provides both 24V DC power and low-voltage, bidirectional communication that adheres to to RS-485 standards.

Each job with Cresnet devices will have at least one Cresnet bus network. Every Cresnet bus network has a single host or primary device and one or more client or secondary devices (older materials may refer to hosts as masters and clients as slaves). Every Cresnset device on a given Cresnet bus must be assigned a unique, two-byte hexadecimal Cresnet address, and the amount of available addresses is determined by the bus host. In addition

Cresnet devices allowed on any given Cresnet bus is limited by the type of host

There are two limiting factors as to the number of Cresnet devices that can be supported on a single Cresnet bus: the number of available Cresnet addresses and the amount of available power. 

Zūm Link wiring is covered in more detail here.

Cabling

Cresnet cabling provides the physical infrastructure for communication between Crestron Cresnet devices and consists of a 4-wire, 2-pair cable available directly from Crestron with either plenum and non-plenum rated jackets. 

Terminations

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See Figure 1 for details.
See Figure 2 for details.

Crestron Wiring Notes

Crestron includes some general Cresnet wiring guidelines in their submittals. Many of these suggestions are covered above, but we have included them here for reference: