ARC-2 and ARC-2i Menu ARCs
ARC-2 and ARC-2i Menu ARCs
Quick Start Guide
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Quick Start Guide
ARC-2 and ARC-2i Menu ARCs
What Ships in the Box
• A Menu ARC hardware device.
• ARC-2 only: One PS-6 (domestic) or
PS-6E (export) power supply which
provides 9 VDC @ 500 mA.
• This Quick Start Guide.
What You Need to Provide
• A Windows® PC with 1 GHz or higher
Pentium® and:
Important Safety
• Windows XP® Vista®.
• 250 MB free storage space.
• 1024x768 graphics capability.
• 16-bit or higher colors.
• CD-ROM drive or Internet connection.
• 512 MB or more of RAM as required by
your operating system.
• Shielded twisted pair wire to connect
the Modular ARC’s RS-485 terminals to
the RS-485 port of a Symetrix hardware
• CAT5 cables to connect any ARC to any
device with an RJ-45 ARC port.
8:00 am to 4:30 pm
Monday through Friday,
Pacific Time
This Class B Digital apparatus meets all
requirements of the Canadian InterferenceCausing Equipment Regulations
Cet appariel numerique de la classe
B respecte toutes les Exigences du
Reglement sur le materiel brouilleur
du Canada.
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Follow all instructions.
Do not use this apparatus near water.
This apparatus shall not be exposed to
dripping or splashing and no objects
filled with liquids, such as vases, shall be
placed on the apparatus.
Do not install near any heat sources such
as radiators, heat registers, stoves, or
other apparatus (including amplifiers) that
produce heat.
This apparatus shall be connected to
a mains socket outlet with a protective
earthing connection. Do not defeat
the safety purpose of the polarized or
grounding-type plug. A polarized plug has
two blades with one wider than the other.
A grounding type plug has two blades
and a third grounding prong. The wide
blade or the third prong are provided for
your safety. If the provided plug does not
fit into your outlet, consult an electrician
for replacement of the obsolete outlet.
The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert the user of the presence
of uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufficient magnitude to constitute
a risk of electric shock to persons. The
exclamation point within an equilateral
triangle is intended to alert the user of
the presence of important operating and
maintenance (servicing) instructions in the
literature accompanying the product (i.e.
this Quick Start Guide).
CAUTION: To prevent electric shock,
do not use the polarized plug supplied
with the unit with any extension cord,
receptacle, or other outlet unless the
prongs can be fully inserted.
Power Source: This Symetrix hardware
uses a switching power supply that
automatically adjusts to the applied
voltage. Ensure that your AC mains
voltage is somewhere between 100-240
VAC, 50-60 Hz. Use only the power
cord and connector specified for the
product and your operating locale. A
protective ground connection, by way of
the grounding conductor in the power
cord, is essential for safe operation. The
appliance inlet and coupler shall remain
readily operable once the apparatus has
been installed.
User Serviceable Parts: There are no
user serviceable parts inside this Symetrix
product. In case of failure, customers
inside the U.S. should refer all servicing to
the Symetrix factory. Customers outside
the U.S. should refer all servicing to an
authorized Symetrix distributor. Distributor
contact information is available online at:
Do not block any ventilation openings.
Install only in accordance with the
manufacturer’s instructions.
Protect the power cord from being
walked on or pinched particularly at
plugs, convenience receptacles, and the
point where they exit from the apparatus.
Only use attachments/accessories
specified by the manufacturer.
Use only with the cart, stand,
tripod, bracket, or table
specified by the manufacturer,
or sold with the apparatus.
When a cart is used, use
caution when moving the cart/apparatus
combination to avoid injury from tip-over.
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions: (1) This device
may not cause harmful interference,
and (2) this device must accept any
interference received, including
interference that may cause undesired
Heed all warnings.
Tel: +1.425.778.7728
Keep these instructions.
Clean only with dry cloth.
All Symetrix software, the Windows
applications that control all Symetrix
hardware, include a help module which
acts as a complete User’s Guide for both
hardware (including the Menu ARC) and
If you have questions beyond the scope
of the help module, contact our Customer
Support Group in the following ways:
Read these instructions.
Getting Help
Unplug this apparatus during lightning
storms or when unused for long periods
of time.
Refer all servicing to qualified service
personnel. Servicing is required when
the apparatus has been damaged in any
way, such as power-supply cord or plug
cord is damaged, liquid has been spilled
or objects have fallen into the apparatus,
the apparatus has been exposed to rain
or moisture, does not operate normally, or
has been dropped.
Quick Start Guide
The RJ-45 connectors labeled “ARC” are only for use with the ARC series of remotes.
DO NOT plug the ARC connectors on Symetrix products into any
RJ-45 connector labeled “SYMLINK”,“ETHERNET” or “COBRANET”.
The “ARC” RJ-45 connectors on Symetrix products can carry anywhere from 6 to 24 VDC which
can damage SymLink, Ethernet and CobraNet circuitry.
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ARC-2 and ARC-2i Menu ARCs
Pictured: the
ARC-2 (above)
and the
Series ARC-2i
The ARC-2 and ARC-2i, known together
as the Menu ARCs, are menu-driven
remote controls for Symetrix DSPs.
Tap into the full power of your system with
twenty-four (24) menus with up to sixteen
(16) items each that can be used to address
multiple basic functions or initiate complex
logic-based control events: gain, preset
triggering, source selection, room combining
and more. The 8-character
backlit display supports up
to thirty-one (31) scrolling
characters, providing
instant user feedback
for control assignments,
default settings, and
actions. The three buttons
help you navigate menus,
raise or lower values,
and enable or disable
the remote control. All
control assignments,
including item labeling,
parameter limits and
firmware version upgrades
are handled by software
included with Symetrix
DSP hardware. Power,
control, and a single channel of ARC Audio
are connected via RJ-45 inputs or screw-
Menu ARC Features
Atmel ATmega 128
Field-Upgradeable Firmware
Number of Menus
Enumerations per Menu
Menu Range Limits
Maximum Characters per Menu Name
Maximum Number of Strings*
ARC Audio Support
115k RS-485 Baud Rate Support
Maximum Operating Voltage
30 VDC
*A “string” is equal to eight characters.
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type barrier strips. Intuitive Navigation:
Pressing the menu button navigates through
the menu names. The menu button also
acts as a preset trigger when a preset list
is scrolled. The up/down arrow buttons
adjust parameter settings and scroll through
preset lists. Holding the menu button and
using the up/down arrow keys moves you
forward or backward through the menus.
Programmable Setup: The wall panel’s
behavior is programmable as well. Menu
brightness in “active” and “inactive” states
can be set independently, so the display will
“sleep” in light-sensitive environments like
theaters. If the Menu ARC goes idle, it can
scroll a message and return to the top of its
menu tree. Upper and lower parameter limits
help contain the range of adjustment and a
button press lockout will prevent tampering
by curious but unauthorized fingers. The
ARC-2 features an aluminum faceplate and
includes a power supply while the ARC2i features a white plastic faceplate and is
powered directly by its host device, power
supply not included. Both mount into a single
gang electrical box (US).
Menu ARC Anatomy
Quick Start Guide
Menu ARC Anatomy
Nearly all of the configuration and connection options are on the rear of the Menu ARCs except for the baud rate selection
jumper (see Baud Rate Select section). The anatomy of a Menu ARC is outlined below:
J8: RS485, Power and ARC Audio
When powering a Menu ARC from the
included PS-6 power supply, RS485
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 J5 or J6.
J9: ARC Audio Grounding
Two sets of jumpers at J9 configure
the grounding of the ARC Audio
pair. Refer to the legend below
for positions. Refer to the ARC
Network Design section for more
Additionally, ARC Audio connections,
AF+ and AF-, are provided. Again,
GND is shared.
J5 and J6: RJ45 “ARC” ports
The ARC ports distribute RS485
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
J7: RS485 Termination
Refer to the RS485 Termination
section for more information.
ARC Audio Grounding Legend
S4: Device Address DIP Switches
Configures the device’s RS485
bus address. Refer to the Device
Addressing section for more
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ARC • Network Design • ARC Audio
ARC-2 and ARC-2i Menu ARCs
Remote ARCs
If power is not distributed over CAT5, each RS-485 chain
will be limited to 1000 ft in a star network configuration
and 4000 ft in a daisy-chain network configuration. Longer
distances may be possible using third party RS-485
extender products.
The ARC ports distribute power and RS-485 data to one or
more ARCs arranged in one or more chains over standard
CAT5 cable. Most Symetrix products with an ARC port
can power from two (2) to ten (10) ARCs. (Please see the
individual products’ documentation for specific details.)
Disclaimer: From time to time we test the compatibility of
our own products with those of third parties. While we are
happy to share with our customers the results of our own
studies as well as other possibly unsubstantiated information
regarding these third party products, it is the policy of
Symetrix, Inc. to neither endorse, recommend nor support
products manufactured and/or supplied by third parties.
The responsibility of choosing third party products which
are compatible with Symetrix products rests solely with the
qualified contractor, consultant or system designer.
WARNING: The RJ-45 connectors labeled “ARC”
are only for use with the ARC series of remotes.
DO NOT plug the ARC connectors on Symetrix
products into any RJ-45 connector labeled
“SYMLINK”, “ETHERNET” or “COBRANET. The “ARC” RJ45 connectors on Symetrix products can carry anywhere
from 6 to 24 VDC which can damage SymLink, Ethernet and
CobraNet circuitry.
ARC Network Design
ARC PORT PINOUT (both Grounds and
Powers required for specified distance)
The ARC can be powered two ways: (1) over CAT5 via the
RJ-45 “ARC” port on ARC-enabled Symetrix products, or (2)
by local 6 to 24 VDC power supplied to the ARC’s terminal
block connections.
Pin # Function
Audio (+)
The ARC’s power requirements vary depending on the
voltage supplied to it. At 15 VDC, it uses approximately
115 mA, while at 6 VDC it uses approximately 300 mA
maximum. As the voltage goes from 15 to 6 VDC, the
current requirement increases accordingly.
Audio (-)
Common Ground
RS-485 Data (A)
RS-485 Data (B)
Common Ground
ARCs can be daisy-chained and fed power over this daisychain from the ARC port. However, as the length of the
cable increases, so does the resistive line loss, which lowers
the voltage available at each subsequent ARC. The actual
power drain on each output from an ARC port can vary
substantially depending on the number of ARCs and the
distance each of them is separated by. In order to assist
with system design, Symetrix has available a Microsoft Excel
spreadsheet that can help a system designer determine
power requirements based upon cable length, number of
ARCs and the power supply to be used. This spreadsheet
can be downloaded from the Symetrix Technical Support
pages at:
Power (+V)
Power (+V)
Note: The ARC Audio lines may be grounded at the Symetrix Rack-mount
device and the ARC wall panel to provide additional distance.
WARNING: When designing a system, one must
be careful not to double power any ARCs. If all
pins on the CAT5 connections are used, power
can travel over the CAT5 cable and reach any ARC on that
particular chain. So, power over CAT5 could potentially
come from the originating ARC port or from an ARC that is
powered locally and then daisy chained via CAT5 to other
ARCs. In general, it is recommended to use only one type of
connector on the ARCs, either the RJ-45s (with CAT5 cable)
or the terminal blocks
The following table gives some indication of cabling
limitations, based on DC power only (the following table is
only relevant for the RJ-45 ARC port when powering a
Menu ARC from the ARC-PS): minimum stated distances
assume 28 gauge CAT5 cabling, maximum stated distances
assume 24 gauge CAT5 cabling.
ARC Audio
ARC Audio provides a means to take a single balanced
analog audio line and either inject it into or pick it off an
RS-485 network’s CAT5 cable run. An ARC Audio port
on a Symetrix device may be wired to a nearby device’s
analog input or output. This provides a means of easily
running a single audio channel to or from a remote source or
destination. The ARC-MIC and ARC-XLR make use of ARC
Maximum total cable length
(to end of chain)
Number of ARCs in
1 daisy-chain
224-640 ft.
276-792 ft.
350-1028 ft.
486-1396 ft.
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ARC Audio • RS-485 Termination • Device Addressing
RS-485 Termination
Audio to transport audio signals back to a Symetrix rack
mount device.
The Menu ARCs feature an RS-485 termination jumper.
Jumper J7 next to the RS-485 terminal block (J8) enables
and disables termination. Terminated and Open positions are
labeled by the PCB silkscreen. For maximum signal integrity,
follow the termination guidelines below:
Note 1: The original Menu ARC remote (simply named
“ARC”) does not support ARC Audio lines and will ground
the audio lines if connected.
Note 2: To avoid the possible grounding, mixing, or shorting
of the ARC Audio lines, it is recommended to home run any
ARC devices making use of the ARC Audio lines so that only
one ARC device is on each chain.
Limits of ARC Audio
ARC Audio is a simple analog audio signal travelling the
same cable as the RS-485 data and power. As such, the
usual audio signal cautions apply. Avoid running parallel to
other power lines or near any other sources of EMI or RFI.
Most CAT5 is unshielded and is susceptible to interference
and noise. We provide here the following information on ARC
Audio’s performance and limitations:
0 - 200 ft.
No termination required
200 - 1000 ft.
(if powering over CAT5)
Terminate at the ARC
> 1000 ft.
(or if not powering over CAT5)
Terminate at the ARC-PS, Control I/O
or DSP device and at the furthest ARC
Note: Never terminate a single RS-485 bus at more than
two devices.
Professional line level balanced signals can also be sent over
up to approximately 1500 feet of CAT5 without significant
All unbalanced signals should be avoided completely.
Mic-level Audio:
Unbuffered condenser or dynamic microphones should
generally be avoided, though it may be possible to achieve
decent quality with cable runs of less than 50 feet using a
fairly hot microphone level with a
noise gate or expander in to clean up the signal. This
technique does not provide much flexibility within the system
design, and therefore is not recommended.
Frequency response:
Frequency response can roll-off due to the capacitance of
a long cable run. The amount of roll-off is highly dependent
on source impedance (the output impedance of what is
supplying the signal). Most pro audio devices have low
output impedances (200 Ohms or less) and do not suffer
significant roll-off (approximately -1 dB at 20 kHz with 1500
feet of CAT5). A device with a 600 Ohm output impedance
could cause some audible roll-off (-3 dB at 10 kHz), but
should be of sufficient quality for speech signals.
Data Noise:
With an unbuffered mic and long cables, data noise may
be audible as a “motorboat” sound. Experimenting with
RS-485 termination and baud rate may improve the sound
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Daisy-chain length
For star configurations, terminate at the ARC-PS, Control I/O
or DSP device.
Line-level Balanced Audio:
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Quick Start Guide
ARC-2 and ARC-2i Menu ARCs
Baud Rate Select • Sample System Diagram
Device Addressing
Baud Rate Select
Every RS-485 device (including all Menu ARCs, Modular
ARCs, and Control I/Os) connected to the same RS-485 bus
must be uniquely identified. The Menu ARCs use a bank of
five DIP switches (S4) to designate one of thirty-one device
addresses. Addressing is done in a binary fashion. Some
examples are depicted below:
J10 on the Menu ARC sets the RS-485 baud rate for the
device. Jumpered = 38.4 kbps, Open = 115.2 kbps. All
devices on the same RS-485 bus must be set to the same
rate. Additionally, the device hosting the RS-485 bus must
be switched to the appropriate rate. As of this writing, only
SymNet Express devices are capable of hosting a 115k
baud rate. All other Symetrix devices host a 38.4k baud rate.
Refer to SymNet Designer’s Help for information on setting
the RS-485 baud rate.
Menu ARC DIP Switch Settings
Note: the Menu ARC’s faceplate will need to be removed
in order to access this jumper. J10 is just below the menu
NOTE: For the sake of space, a small variety of configurations are shown.
A total of 31 devices per RS-485 bus are possible.
J10: Baud Rate Select
Jumpered = 38.4 kbps,
Open = 115.2 kbps.
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Sample System Diagrams
Quick Start Guide
Sample System Diagram: Symetrix Integrator Series
RC-4: Volume and
Source Selection
MS-1: Ambient
Noise Sensing
Paging Mic
ARC-2i: Main Volume
and Preset Selection
Paging Mic
CD Player
Satellite Tuner
Sample System Diagram: SymNet Hotel Application
Restaurant & Bar
Banquet & Meeting Rooms
Wall Panel
controls local
volume, source
selection, and
time of day
Wall Panels control
local room BGM
sources, BGM and
Mic volumes. Wall
Panels link when
rooms are
Wall Panel
selects paging
ARC Audio to
DSP audio input
RS-485 from Master DSP
device to ARC-PS
CAT5 Connection
Shielded Twisted
Pair Connection
SymNet DSP Device(s)
This illustration of a typical SymNet Network Audio Solution shows the
place of the ARC-PS in a large, multi-purpose network audio solution.
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Warranty and Service
ARC-2 and ARC-2i Menu ARCs
The Symetrix Limited Warranty
Servicing Your Symetrix Product
Symetrix, Inc. expressly warrants that the product will be free from
defects in material and workmanship for three (3) years from the date
the product is shipped from the factory. Symetrix’s obligations under this
warranty will be limited to repairing or replacing, at Symetrix’s option,
the part or parts of the product which prove defective in material or
workmanship within three (3) years from the date the product is shipped
from the factory, provided that the Buyer gives Symetrix prompt notice
of any defect or failure and satisfactory proof thereof. Products may be
returned by Buyer only after a Return Authorization number (RA) has
been obtained from Symetrix. Buyer will prepay all freight charges to
return the product to the Symetrix factory. Symetrix reserves the right
to inspect any products which may be the subject of any warranty claim
before repair or replacement is carried out. Symetrix may, at its option,
require proof of the original date of purchase (dated copy of original
retail dealer’s invoice). Final determination of warranty coverage lies
solely with Symetrix. Products repaired under warranty will be returned
freight prepaid via United Parcel Service by Symetrix, to any location
within the Continental United States. Outside the Continental United
States, products will be returned freight collect.
If you have determined that your Symetrix product requires repair
services and you live outside of the United States please contact your
local Symetrix dealer or distributor for instructions on how to obtain
service. If you reside in the U.S. then proceed as follows:
Return Authorization
At the Symetrix factory, Symetrix will perform in-warranty or out-ofwarranty service on any product it has manufactured for a period of
three (3) years from date of discontinued manufacture.
Before sending anything to Symetrix, please contact our Customer
Service Department for a Return Authorization (RA) number. The
telephone number is +1.425.778.7728. Additionally, support is available
via the web site:
In-warranty Repairs
To get your Symetrix product repaired under the terms of the warranty:
The foregoing warranties are in lieu of all other warranties,
whether oral, written, express, implied or statutory. Symetrix, Inc.
expressly disclaims any IMPLIED warranties, including fitness
for a particular purpose or merchantability. Symetrix’s warranty
obligation and buyer’s remedies hereunder are SOLELY and
exclusively as stated herein.
This Symetrix product is designed and manufactured for use in
professional and studio audio systems and is not intended for
other usage. With respect to products purchased by consumers for
personal, family, or household use, Symetrix expressly disclaims
all implied warranties, including but not limited to warranties of
merchantability and fitness for a particular purpose.
Call us for an RA number (have the serial number, shipping and contact
information and description of the problem ready).
Pack the unit in its original packaging materials.
Include your name, address, daytime telephone number, and a brief
statement of the problem.
Write the RA number on the outside of the box.
Ship the unit to Symetrix, freight prepaid. We do not accept freight
collect shipments.
Just do these five things, and repairs made in-warranty will cost you only
one way freight charges. We’ll pay the return freight.
Symetrix does not authorize any third party, including any dealer or
sales representative, to assume any liability or make any additional
warranties or representation regarding this product information on behalf
of Symetrix.
If you don’t have the factory packaging materials, we recommend using
an oversize box. Wrap the unit in a plastic bag, surround it with bubblewrap, and place it in the box surrounded by Styrofoam peanuts. Be sure
there is enough clearance in the box to protect the rack ears. We won’t
return the unit in anything but Symetrix packaging for which we will have
to charge you. If the problem is due to operator misuse or error, you will
have to pay for both parts and labor. In any event, if there are charges
for the repair, you will pay for the return freight. All charges will be COD
unless you have made other arrangements (prepaid, Visa or Mastercard).
This limited warranty gives the buyer certain rights. You may have
additional rights provided by applicable law.
Out-of-warranty Repairs
Note: Some Symetrix products contain embedded software and may
also be accompanied by control software intended to be run on a
personal computer. Said software is specifically excluded from
this warranty.
If the warranty period has passed, you’ll be billed for all necessary parts,
labor, packaging materials, and freight charges. Please remember, you
must call for an RA number before sending the unit to Symetrix.
This limited warranty, with all terms, conditions and disclaimers set forth
herein, shall extend to the original purchaser and anyone who purchases
the product within the specified warranty period.
Limitation of Liability
The total liability of Symetrix on any claim, whether in contract, tort
(including negligence) or otherwise arising out of, connected with, or
resulting from the manufacture, sale, delivery, resale, repair, replacement
or use of any product will not exceed the price allocatable to the
product or any part thereof which gives rise to the claim. In no event will
Symetrix be liable for any incidental or consequential damages including
but not limited to damage for loss of revenue, cost of capital, claims of
customers for service interruptions or failure to supply, and costs and
expenses incurred in connection with labor, overhead, transportation,
installation or removal of products, substitute facilities or supply houses.
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Item No. 53-0018
ARC-2 and ARC-2i Menu ARCs Quick Start Guide
© 2012 Symetrix, Inc. All rights reserved. Printed in the United States of America. The information in this document is subject to change without notice.
Symetrix, Inc. shall not be liable for technical or editorial errors or omissions contained herein; nor is it liable for incidental or consequential damages
resulting from the furnishing, performance, or use of this material. Mention of third-party products is for informational purposes only and constitutes
neither an endorsement nor a recommendation. Symetrix assumes no responsibility with regard to the performance or use of these products. Under
copyright laws, no part of this brochure may be reproduced or transmitted in any form or by any means, electronic or mechanical, without permission
in writing from Symetrix, Inc. If, however, your only means of access is electronic, permission to print one copy is hereby granted. The following are
either Trademarks or Registered Trademarks of Symetrix, Inc.: Symetrix, SymNet, SymNet Designer, SymLink and CobraLink. Windows is a Registered
Trademark of Microsoft, Inc.. Other product names mentioned herein may be trademarks and/or registered trademarks of other companies and are
property of their respective owners.
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