Symetrix ARC-K1 - Page 8

8
Quick Start Guide
6408 216th Street SW | Mountlake Terrace, WA 98043 USA
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Brain Anatomy
The Modular ARCs, true to their modular construction, utilize
an “expansion” board (which provides the user interface)
and a “brain” board (which provides the system, logic and
expansion connections, device addressing, processing,
etc.). Each Modular ARC must have one brain board to
which up to six extra expansion boards attach. Each brain
board has at least one expansion board attached by default
(anARC-K1alreadyhasoneEXK).Thebrain
board possesses the host processor, system connection
and power jacks, configuration jumpers and device
address rotary switches. To quickly identify a brain board,
look for the RJ-45 jacks. The anatomy of a brain board is
outlined below:
J12: RS-485 and Power
When powering a Modular ARC from the
includedPS-6powersupply,RS-485data
and Power both connect here. Connect
the PS-6 positive lead to “V+” and the
negativeleadto“GND”.TheRS-485
shield or ground also connects to “GND”
andtheRS-485conductorpairconnects
thebusinaparallelfashionto“A”andB”.
WARNING! Do not use at the same time
as J9.
J11: RS-485 Termination
Place a jumper here to terminate the
RS-485busatthisdevice.Refertothe
RS-485Terminationsectionformore
information.
J9: RJ-45 “ARC” ports
TheARCportsdistributeRS-485data,
power and an ARC Audio line to one
or more ARC devices over standard
CAT5 cable. These ports may be used
to chain multiple ARCs or to home
run back to any Symetrix rack mount
device with an ARC port.
S1: Device Address “Ones”
Rotary switch which sets the device
address “ones” (1-9).
S2: Device Address “Tens”
Rotary switch which sets the device
address “tens” (10, 20, 30, 40, etc.).
J7: Baud Rate Select
Jumpered=115k,Open=38.4k.See
theRS-485BaudRatesectionformore
information.
J6: Hardware Lockout
Open=Unlocked,Jumpered=Locked.
SeetheHardwareLockoutsectionfor
more information.
J5: Logic Input
LogicinputaddressablefromSymNet
Designer’sRS-232/485Controller
Number system. Pin 1 is the active
input, Pin 2 is ground.
J8: Open Collector Output
Logicoutputaddressablefrom
SymNetDesigner’sRS-232/485
Controller Number system. Pin 1 is
the active output, Pin 2 is ground.
J13: ARC-Audio
The CAT5 cable connection provides
a balanced analog audio line
between the system and a remote
source or destination. Connects to
theMICorXLRintheARC-MICor
ARC-XLR,respectively.Canalsobe
wired to an installer-supplied audio
source/destination.
J2: Modular ARC Expansion Bus
Modular ARC expansion devices
daisy-chain from this connection.
BrainAnatomy