8
Quick Start Guide
6408 216th Street SW
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Mountlake Terrace, WA 98043 USA
T
+1.425.778.7728
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+1.425.778.7727
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www.SymetrixAudio.com
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
