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 Cresnet device on a Cresnet bus must be assigned a unique, one-byte hexadecimal Cresnet address. The range of available addresses is determined by the bus host:

Power considerations also play a role in determining the number of Cresnet devices which can be supported on a Cresnet bus, however we will not cover them here due to the wide array of variables which impact power calculations and determining whether there is sufficient power for a given device.

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: