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Commercial Lighting Design Guide Control Processors
Doc. 4775A 78
Control Processors
PAC2 Lighting Control Processor
The PAC2 enables efficient control of lighting and other
systems such as HVAC and security, and has been
specifically designed for the Crestron automation
enclosure and the Crestron lighting system (although
other Crestron processors can also be used).
The PAC2 occupies one module space in single-width
enclosures and two module spaces in double-width
enclosures.
NOTE: Crestron recommends that the control processor
be mounted within a separate CAEN enclosure to create
a simplified low voltage wiring center.
Cresnet
®
Distribution
The built-in Cresnet Hub/Repeater serves as a repeater,
splitter, and wiring block. The hub allows for 252 or more
devices (touchpanels, keypads, etc.); 32 per segment (A-
H) and distribution up to 3000 feet of Cresnet cable run
per segment. There are eight independent segments,
each with four Cresnet connectors wired in parallel.
In addition, there is a master NET port on the bottom
panel. The eight NET (A-H) activity LEDs illuminate when
a device on the respective segment transmits data. When
powered by the internal power supply, a maximum of 50
watts (DC) is available for all connected network devices.
The LEDs indicate communication on the Cresnet link.
Memory Expansion
The on-board 36MB memory is enhanced with a 4GB
expansion slot that supports off-the-shelf Type II compact
flash memory and the IBM Microdrive
hard disk drive, for
on-board storage of program and touchpanel files, room
and equipment profiles, upgrades, databases, and
schedules. Memory is non-volatile to protect against
power loss.
Ethernet and e-Control
®
2
The unique Crestron dual bus system, with its high speed
I/O bus architecture, provides blazing fast throughput,
system wide. The two 40Mb/s Y-BUS expansion slots
offer the option of installing any of the CNX-series cards
and all C2-series control cards listed in the Crestron
Product Catalog. The 300Mb/s Z-BUS expansion slot is
designed for super high speed control card applications
such as 10/100 Ethernet, available via the Crestron
single-port C2ENET-1 or dual-port C2ENET-2 cards.
The PAC2 also provides true secure network
communications, which is required for today's corporate
networks, automated residence systems, and the Internet.
The Dual Port 10/100BaseT Ethernet card (C2ENET-2)
supports dynamic and static IP addressing and full duplex
TCP/IP and UDP/IP. It offers a WAN port for Internet and
remote-location communications and a LAN port for local
in-home or in-office use. A built-in firewall delivers
network security with the Network Address Translator
(NAT) and router functions. The built-in Web server uses
memory storage on a compact flash card for remote
access and control.
Backup and Override
The PAC2 provides external connections for both a back-
up processor and emergency override closure signals.
In the absence of Cresnet, a signal is generated to switch
power and communication of the Cresnet system to the
back-up processor. When the override connection
receives a contact closure, a signal is passed to the
lighting modules via the fifth wire of the module
interconnect cable, and the lights are turned on to a
programmed preset emergency level. They remain at
this level until that contact closure is removed.
The Backup Net Input connector allows a backup control
system to automatically take control of the Cresnet
network in the unlikely event of an internal processor
failure. The exclusive, built-in Cresnet watchdog switches
over when the CPU fails.