BASIS 922az User Manual

BASIS 922az User Manual
BASIS 902zz
8 Output CobraNet Enabled Control and Monitoring Signal Processor
Hardware Manual
TD-000146-00 rev.A
The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to
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 humans.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in this manual.
Electrical energy can perform many useful functions. This unit has been engineered and manufactured to
assure your personal safety. Improper use can result in potential electrical shock or fire hazards. In order
not to defeat the safeguards, observe the following instructions for its installation, use and servicing.
CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside.
Refer servicing to qualified service personnel.
WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture.
1- Maximum operating ambient temperature is 50°C (122°F).
2- Never restrict airflow through the device fan or vents. Please insure that the air intake and exhaust
vents are unobstructed.
3- When installing equipment into rack, distribute the units evenly. Otherwise, hazardous conditions
could be created by an uneven weight distribution.
4- Connect the unit only to a properly rated supply circuit. The BASIS 902zz is suitable for connection to
100 - 240 VAC, 47 - 440 hertz, with no special considerations other than the appropriate IEC power cord.
5- Reliable Earthing (Grounding) of rack-mounted equipment should be maintained.
NOTE: This equipment has been tested and found to comply with the limits for a class B digital device,
pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses, and can radiate radio
frequency energy and if not installed and used in accordance to the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in
a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by switching the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio or TV technician for help.
© Copyright 2004 QSC Audio Products, Inc. QSC® is a registered trademark of QSC Audio Products, Inc. “QSC” and the QSC logo are registered
with the U.S. Patent and Trademark Office. All trademarks are the property of their respective owners.
Don’t want to read the entire manual? Just
want to dig right in? Go to page 18....
The BASIS 902zz provides the digital audio transport, signal
processing, control and status monitoring facilities needed
to bind a group of amplifiers and loudspeakers into an integrated functioning system. In conjunction with software, the BASIS 902zz enables the user to
design, test and deploy professional audio reinforcement
and distribution systems ranging in size from one to hundreds of channels.
Each QSC power amplifier connects directly to a BASIS
902zz via one of its four QSC DataPorts. All mission-critical
elements of the BASIS-driven sound system are monitored.
User-selected events are logged and loudspeaker protection
features unique to BASIS such as QSC's power limiter are
made possible through the DataPort functionality.
A standard Windows computer is the principle user-interface for controlling the overall BASIS/QSControl system.
However, the BASIS 902zz also offers a front panel interface
for accessing critical functions.
A single QSControl server computer can support several clients running QSC's latest Venue Manager software. Thus,
the sound system can be operated via several computers,
roaming wireless laptops, tablets, etc., all at the same time,
1- Power indicator
2- Diagnostic indicator
3- Network status indicators
4- Port connection status indicators
5- Multi-function push buttons
6- Display
7- Rotary select/accept knob
8- Safe push switch (recessed)
9- DataPorts
from anywhere a connection to the QSControl network is
The QSControl network can also be managed from a single
computer running both the client and the server. Once all
BASIS devices in a system are configured, a computer is no
longer required on that system’s network. All basic functions of the BASIS 902zz continue to operate with or without a control computer connected to the network.
Audio enters a BASIS 902zz from CobraNet source devices
such as QSC's line of RAVE digital audio routers. Any combination of 24 CobraNet channels (selected from up to 4 bundles of 32 channels) can be routed into the 24 x 24 DSP
engine. Any or all of the 24 DSP channels can also be routed
to up to 32 CobraNet channels on the network.
Unlike many configurable DSP boxes, the intrinsic processing latency of the BASIS 902zz is both short and fixed at
0.396 milliseconds. The delay does not change regardless of
the DSP configuration, unless the configuration intentionally adds more delay.
10- Monitor chain in/out
11- Relay outputs
12- Logic outputs
13- Omni inputs
14- RS-232 port
15- Network status indicators
16- QSControl 10BaseT receptacle
17- CobraNet 100BaseTx receptacle
18- IEC power inlet
See page 14 for detailed descriptions.
Introduction (continued)
The BASIS 902zz also supports the new optional lowlatency CobraNet feature that provides transport at only
2.66 milliseconds delay.
Both software and firmware can be easily updated over the
network. In the future, QSC will be adding new capabilities
to both BASIS and Our latest code releases
and access to up-to-date information on BASIS and are available at We invite you
to visit us there.
Block Diagram
We've applied our many years experience in supporting
high-end installed sound with our previous system-building
products such as RAVE, QSControl, CM16a, DSP-3, DSP-4,
and DSP-30. The BASIS 902zz brings all that technology
together in one compact, powerful, easy to use system. We
are confident that your new BASIS 902zz will provide years
of dependable service and we hope it will help you, the system designer and implementer, to express your creative
audio system ideas.
Introduction - Networking the BASIS 902zz
The BASIS 902zz has two RJ-45 network connection ports on the rear panel. One port is labeled "QSControl" and supports standard
10BASE-T Ethernet. The other port is labeled "CobraNet" and supports 100BASE-TX, also known as "Fast Ethernet". In the following we
describe the use of these ports and show example network connection schemes.
The BASIS 902zz supports two distinct kinds of network activity; the first is audio transport via CobraNet, and the second is control and
monitoring via The user can choose to install one network for CobraNet traffic and a second separate network for
QSControl traffic. We call this the "Two Wire Interface". Alternately, it is possible to run both control and audio traffic over CobraNet
via the CobraNet port. In this case the QSControl port is unused. We call this the "Single Wire Interface".
Under the most demanding real-time control conditions and when using the lowest latency CobraNet settings, users may experience
better QSControl performance using separate networks, especially when displaying a great many real-time meters. For most applications, separate networks won't provide any discernible benefits and will of course cost more. We therefore recommend using the Single Wire Interface when running CobraNet.
Why CobraNet Needs Special Treatment:
Ordinary Ethernet traffic has no guaranteed time of delivery. Packets of information may arrive at their destination out of order and
some may be delayed more than others. This is fine for E-mail and even for downloading MP3 files over the Internet. Everything ends up
properly reassembled at the destination, but how long this takes will vary according to network loading, span, etc. In contrast, CobraNet is "real time" - it delivers audio with a minimal, consistent transmission delay. CobraNet is designed to use as much of conventional
networking technology as possible while providing both guaranteed time of delivery and isochronicity - maintaining a phase-locked
sample-accurate clock across the entire network. These requirements mean that ordinary unregulated Ethernet data cannot be freely
mixed with CobraNet information. The two can coexist on the same wire, but only by adhering to the proper rules.
To learn more about CobraNet and appropriate network topologies, please visit
resources.htm and
Notes on Network Systems Design:
As with any communications system, the reliability and performance of a local area network is intimately related to the designer's skill
and knowledge in implementing a topology that is robust, efficient and standards-compliant. Proper network design is even more critical in distributed multimedia systems. Therefore, it is important for the system designer to realize that some conventional network
practices must be avoided. Although each network design is unique and may carry its own performance requirements, compliance to
the following three points will assist in building an audio network that is trouble free and efficient.
First, audio and conventional data communications deliveries should not exist on the same LAN or VLAN. The exception to this is the
BASIS 902zz Single Wire Interface, which offers a solution for converging audio and onto the same LAN or VLAN. However, conventional communications, such as corporate networks, print services, e-mail and Internet access, should not exist alongside
CobraNet audio and on the same LAN or VLAN. Further, CobraNet audio and data should not exist
together on the same LAN or VLAN when implementing the Two Wire Interface. This is not to say that conventional communications
cannot share the same network hardware with a BASIS 902zz. In fact, common network hardware, such as managed Ethernet switches
and media converters, can service both BASIS 902zz products and conventional data communications equipment so long as the managed switch or media converter are partitioned into separate network domains. This is normally done by configuring a separate VLAN
for each data type. (Some switches may allow individual port assignments or support partitions through DIP switch selection.)
Second, CobraNet audio must traverse either a repeater domain or a network switch domain. The point here is that the CobraNet port
on a BASIS 902zz must connect directly to, and only to, either a repeater LAN or a switched Ethernet LAN. Hybrid networks containing
both repeaters and switches are not permitted on the audio segment. Connecting the CobraNet port to a repeater that is in turn connected to a network switch poses an illegal and non-compliant condition. We recommend always connecting the QSControl and/or
CobraNet port(s) directly to network switch ports.
Third, the BASIS 902zz and system are targeted at network switch deployments.
The consumer costs of Ethernet switches have continued to fall over the last several years and are now comparable with repeaters on
a per port basis. In addition, the sophistication and scalability of network switches make them ideal for new installations. However, we
do realize that designers may wish to add BASIS products to existing audio network installations that are built on repeater LAN topologies. This applies primarily to existing CM16a and RAVE networks. For this very reason we continue to support connectivity to network
repeater hardware with the BASIS 902zz. Support for network repeaters exist only with the Two Wire Interface. That is to say that the
QSControl port and the CobraNet port must be connected to separate repeater LANs. Even when properly configured, audio channel
capacity is severely limited and both audio and control network expansion is limited by the respective wire speed of each segment. In
other words, scalability ceases to exist when bandwidth demands on the QSControl segment approach 10 Mbps and demand on the
CobraNet segment approaches 100 Mbps. Obviously, we recommend taking advantage of switch network technology whenever possible.
It should be noted here that while the CobraNet port on a BASIS 902zz is restricted to repeater LAN or switch LAN deployments, is a TCP/IP standards-compliant network system and therefore supports operation on network repeaters, switches and
routers. When implementing the Two Wire Interface, the segment does not require a single topology data path and
therefore repeaters, switches and routers may be assembled on the LAN in a hybrid fashion.
To learn more about network design rules and system compliance visit the QSC network resources page at
products/network/resources.htm. To learn more about CobraNet design requirements and to obtain the CobraCAD system design utility
visit the Peak Audio website at
All of this may seem daunting if you are new to networking. However, it all boils down to connecting a few simple cables between various networking devices. Most of the time it "just works". QSC helped pioneer CobraNet with our RAVE ™ products and there are hundreds of installations all over the world, in theme parks, hotels, stadiums - everywhere. They run hum-free, sound great and are very
The following examples will help get you started, but they just scratch the surface of what can be achieved with advanced networking…
Example #1 - X-over mode:
This is the simplest connection you can make between the BASIS 902zz and your computer. You use a CAT-5 crossover cable connected
between the BASIS QSControl port and your computer's Network Interface Card, (NIC). No network switch is required. With server and client software installed and running on your computer you will be able to completely set up and monitor your BASIS
Example #2 - CobraNet X-over mode:
This is the simplest connection you can make between two BASIS boxes. You use a CAT-5 crossover cable connected between the
CobraNet ports of each unit. No network switch is required. This connection allows audio to pass between the two BASIS boxes over
Combining example 1 and 2 lets you setup and monitor one box at a time, much as you would have to do using a point-to-point RS232
connection, while passing audio between them, all without a network switch. However, you would have to physically connect your
computer first to one BASIS box and then to the other. With this elementary connection you don't have a true network. It is like making RS-232 connections - except that performance is better.
All the other examples are of proper networks and all require a network switch. On a proper network, you have direct access to all
units all of the time without having to physically switch between them. You still get the great performance of TCP/IP over Ethernet.
(And we believe QSC's advanced 4th generation networking software provides the best performance of any networked audio control
system available today including Ethernet based systems from competitors.)
Example #3 - Single Wire Interface:
Here all QSControl and CobraNet traffic shares the same single CAT-5 cable between the BASIS 902zz and an unmanaged Ethernet
switch. The system manages traffic flow efficiently and reliably so that all audio and control data is delivered to its
appropriate destination anywhere on the network. This configuration works well when CobraNet audio deliveries are point to point.
Though the example shows only two units, as many devices may be connected as there are available switch ports. All BASIS/RAVE
units will be able to communicate simultaneously with the computer. All will have access to CobraNet audio. Switches can be connected to other switches to build larger networks; all of the normal networking principles apply. (Note: there must be at least two
CobraNet devices online for any data - audio or control - to come out of the CobraNet port)
Example #4 - Two-Wire Interface (shared network hardware):
This example illustrates the Two-Wire Interface with a managed Ethernet switch. The switch is configured with multiple virtual
local area networks (VLANs). Ethernet deliveries can only reach destination ports belonging to the same VLAN from which it was
sourced. The figure shows a separate VLAN for traffic and a separate VLAN for CobraNet audio traffic. This configuration essentially provides a dedicated network for QSControl (including the system controller) and a second dedicated network
for CobraNet audio. As with the previous example, as many BASIS/RAVE units may be connected as there are switch ports available. All units will be able to communicate with the computer. All will have CobraNet audio. Switches can be connected to other
switches to build larger networks; all of the normal networking principles apply.
Example #5 - Two-Wire Interface (separate network hardware):
Example #5 is conceptually similar to example #4. The difference here is that separate networks are created by providing each local
area network (LAN) with its own network switch. Therefore, traffic segmentation is physical rather than logical. Example #5 also provides an additional level of fault tolerance, although at the expense of additional network hardware. The figure shows a separate network switch for traffic and a separate network switch for CobraNet audio traffic. All of the previous comments regarding
network expansion still apply.
There are no special unpacking precautions. However, it is recommended you keep the original packing material for reuse in the rare
event that service be required. If service is required and the original packing material is not available, ensure that the unit is adequately
protected for shipment (strong box of appropriate size, sufficient packing material to prevent load-shifting or impact damage) or call
QSC’s Technical Services Department for packing material and a carton.
What is included in the carton:
BASIS 902zz
Self-adhesive rubber feet
Hardware Manual (this document)
4 Software CD
IEC Power Cord 3 x #18 AWG
3-pin terminal block connector
2-pin terminal block connector
5-pin terminal block connector
The BASIS 902zz can be used in or out of an equipment rack. Rack mounting is optional. Adhesive rubber feet are included for non-rack
mount installations. Use them to prevent the unit from scratching or marring support surfaces.
Rack Mounting
Rack mount the BASIS 902zz by supporting it from underneath while aligning the mounting holes with the threaded screw holes in the
rails; install all four mounting screws and washers and tighten securely. Ensure use of all four mounting screws in order to minimize the
chance of bending or distorting the rack mount ears. If the BASIS 902zz is to be transported while in a rack, we recommend supporting
the rear of the chassis. This will help prevent the unit from being damaged from the increased mechanical stresses of portable and
mobile use. The BASIS 902zz’s chassis includes integral rear mounting tabs for securing to the rack mounting ears.
Be certain not to block
the cooling air ventilation openings on the sides
of the chassis.
Be certain not to block
the cooling air ventilation openings on the
sides of the chassis.
Computer Requirements & Software Installation
Installing is easy. All you need to do is choose the folder where the program is to be stored (the default setting is acceptable for most applications). We recommend your system meet the following minimum requirements:
1- IBM PC compatible computer with a Pentium 4 processor.
2- Processor speed of 1 GHz (2 GHz or faster recommended for systems with 30 or more BASIS units).
3- 512 megabytes of RAM (1 gigabyte recommended for systems with 30 or more BASIS units).
4- Hard drive with at least 500 MB of free space for the program and files you generate.
5- Display resolution of 1024 X 768, 16-bit color.
6- CD-ROM drive to install the software.
7- 10BaseT/100BaseTx network interface card
8- Windows XP Professional, XP Home, Windows 2000 SP2 (or better), or Windows NT4.0 SP6a operating system. Windows 95,
98 and ME platforms are not supported.
Note: If system is used for real-time adjustments and configuration of audio systems, we recommend all Windows Power Options
(located in the Windows Control Panel) features be disabled. Display, hard drive, system standby and hibernation settings should be set
to “Never”. This avoids waiting for the system to “wake-up” if adjustment is needed after an elapsed period of time.
To Install
1- Start your computer and start Windows.
2- If there are any programs running, please close them now. Be sure to leave Windows running.
3- Place the CD-ROM in your CD-ROM drive. If your system supports the Auto Run feature installation begins automatically, otherwise, you can click Start on the task bar, click Run, and browse for the file named setup.exe from the CD.
4- Click the Install button.
5- Follow the installation instructions on the screen.
To Uninstall
1- Click the Start menu button and choose Settings/Control Panel.
2- Double-click the Add/Remove Program icon.
3- Select from the list, then click Add/Remove.
4- Click Yes to confirm you would like to uninstall
General Information & Configuration Memories
Amplifier Setup
The QSC DataPort-equipped amplifiers connected to the BASIS 902zz must have their power switches in the “on” position. For initial
testing, use the lowest useful gain setting until the system is operating as expected. After the system setup has been verified and
tested, gain settings may be adjusted as required.
The network should be operable and software should be installed/running on the system controller computer.
CobraNet Connection Loss
If you are operating with a valid CobraNet network, and the connection to the network is disrupted, audio will momentarily mute, allowing the BASIS 902zz to synchronize with its internal clock. If CobraNet network connection is re-established, the audio will mute again
while the BASIS 902zz synchronizes with CobraNet.
Configuration Memories
The BASIS 902zz has non-volatile storage locations that contain settings for the device as well as DSP signal flow. The storage locations make it possible to set up the BASIS for different situations and quickly recall the setup with or without software
using the front panel controls.
AC Power Cord
Insert the molded receptacle of the AC power cord into the AC
power inlet on the back of the BASIS 902zz. Plug the AC line connector into the AC outlet. The power supply will accept from 100 to
240 Volts AC, 47 to 440 Hertz, without any changes. If a different
type of IEC power cord is required than the one supplied with your
902zz, contact QSC’s Technical Services Department.
Connect one end of a category-5 cable terminated with a RJ45 plug
into the CobraNet receptacle. Insert the RJ45 plug into the receptacle with the lock-tab oriented toward the bottom of the BASIS
902zz and push firmly until the connector locks into place (usually
an audible “click” can be heard). Connect the other end to the
appropriate CobraNet network port.
CobraNet and
QSControl connection. Accepts
ruggedized or
normal shell-less
RJ45 plugs.
Connect one end of a category-5 cable terminated with an RJ45
plug into the QSControl receptacle. Insert the RJ45 plug into the
receptacle with the lock-tab oriented toward the bottom of the
BASIS 902zz and push firmly until the connector locks into place
(usually an audible “click” can be heard). Connect the other end to
the appropriate network port.
Omni In
The six Omni In connectors are two-pin terminal block connectors.
They can accept contact closure devices (switch, relay contacts),
10k ohm variable resistors, TTL logic level, and 0-5 VDC input.
The contact closure and logic devices accommodate on/off or
state-change events; the variable resistor input provides full 8-bit
resolution allowing for incremental-change events. Refer to the
illustrations for connection recommendations. NOTE! +48 volts is
the absolute maximum that can be applied to the + pin without
damage. Voltage is with respect to chassis or the - pin.
Omni In connections. Variable
input must be 10k
ohm variable
resistor. Contact
closure input can
be a switch or
relay contacts.
These inputs can
operate software
“devices”. Negative (-) terminal is
at chassis potential.
Logic Out
The four Logic Out connectors are two-pin terminal block connectors. They provide CMOS logic level compatible signals for external
Relay Out
Two sets of relay contacts are provided, RELAY OUT 1 and RELAY
OUT 2. Contacts are floating and rated for 30VDC, 1A. There is one
common terminal, one normally-closed contact terminal and one
normally-open contact terminal. These are labeled as C, NC and
NO on the rear panel. When the relay is not energized, the C terminal is connected to the NC terminal and the NO terminal is not connected; when the relay is energized the C to NC connection is
opened and the C to NO connection is closed.
Logic Out connections. Negative (-)
terminal is at
chassis potential.
Positive (+) terminal logic level is
switched using
Relay Out connections. Refer to text,
at left, for explanation.
Monitor Chain
The MONITOR CHAIN connector is a 5-pin terminal block connector. Input and output connections are balanced. The center pin is the shield connection for both the input and output
of the monitor chain. Connection is shown at right. The left-most + and - terminals are for
monitor chain input signals, while the right-most terminals are for monitor chain output signals. When powered down, a relay connects the input to the output, thus bypassing the
BASIS 902zz in the monitor chain.
Monitor Chain connection.
See explanation, at left.
The RS-232 is a utility serial port for accessing certain diagnostic and setup features. Connect to an available COM port on your PC and communicate using a terminal control program such as Windows Hyperterminal.
Use a normal serial data cable with a DB-9 male plug to connect to the BASIS 902zz. To connect the cable, orient the connector properly, then push into the receptacle until it is firmly
seated; tighten the retaining screws “finger tight”. Communications should be 9600 baud,
no parity, 8 data bits, 1 stop bit, and flow control Xon/Xoff.
PORT A through PORT D are QSC DataPorts. When using the BASIS 902zz with QSC
DataPort-equipped amplifiers or QSC DSP products (DSP-3, DSP-4) connect to the BASIS
902zz using QSC DataPort cables. The 902zz supports up to eight channels of DataPort audio
and amplifier status monitoring. This can be four 2-channel amplifiers or one 8-channel
amplifier or other suitable combinations.
If connecting a multi-DataPort amplifier, ensure all the DataPorts of the amplifier are connected and that they are all connected to the same BASIS.
To connect the cable, orient the connector properly, then push into the receptacle until it is
firmly seated; tighten the retaining screws “finger tight”.
LED Indicators
When the BASIS 902zz is plugged into a properly functioning AC outlet, it will power up and
briefly display a welcome screen on the LCD display.
POWER Indicator- This blue indicator illuminates when the BASIS 902zz is plugged into a
properly functioning AC source. There is no power switch on the BASIS 902zz. This helps to
prevent accidental system shutdowns.
DIAGNOSTIC Indicator- This red indicator illuminates during the power-on self test, then
should extinguish. If it remains illuminated, this indicates that the self-test has detected an
unexpected event, such as corrupted firmware or a memory boot failure. If the DIAGNOSTIC
LED remains illuminated, try resetting the BASIS 902zz by cycling power off and on once.
Should the indication persist, contact QSC’s Technical Services for guidance. During operation, any system fault will fully illuminate the indicator. During a “flash” update, the indicator will blink on and off; this is normal. Any error detected will be displayed on the LCD. For
purpose of unit identification, the LED can be remotely turned on using software.
(continued, next page)
LED Indicators (continued)
QSControl and CobraNet Network Status (Port) Indicators- There is a group of three LEDs on the front and rear panels
labeled RX, TX and LINK. One group is for the QSControl network port and the other for the CobraNet network port. Their
functions are described below. Note: Port indicators on rear panel are color coded to match the corresponding color-ring
around the QSControl and CobraNet RJ45s.
RX (receive)- This indicator illuminates any time the BASIS 902zz receives data from the corresponding network.
TX (transmit)- This indicator illuminates whenever the BASIS 902zz transmits data onto the corresponding network.
LINK STATUS- The corresponding indicator illuminates when the BASIS 902zz is connected to an operating network.
PORTS indicators- These indicators are labeled A through D. These indicators are either off, red, green, or yellow, depending on what is connected to the port. The indications are:
off- nothing attached
red- QSC DSP accessory attached
green- QSC DataPort amplifier attached
yellow- QSC DSP and Amplifier combination attached
LCD Display and Controls
The BASIS 902zz has a 2 line X 16 character LCD display. The display and the multi-function push-button switches on either
side provide data access and editing capability. The push-button switches on either side of the display are used to navigate
through the menus. The rotary select/accept knob is active for many displayed items allowing you to scroll through choices by
rotating the control, and accepting choices (entering) by pushing in on the control.
The accessible menus and sub menus may appear differently than the example shown. Software updates may occasionally
improve the interface. On the following page is a the basic navigation flow for the BASIS 902zz menu system.
Front Panel Password Lockout
The password lockout provides the ability to restrict access to all of the editable parameters available on the LCD front panel.
This feature is enabled or disabled via QSControl software only (refer to the “General Tab” area and click on the “Front Panel
Password” button). When the lockout feature is enabled, all front panel LCD functions are readable, but editing of parameters
is now password protected. While in this mode, any attempt to edit a parameter will require the user to enter the Front Panel
Password. The default factory password is “qsc”. The password is stored in the BASIS unit and can be changed using the
QSControl software.
Once the password has been correctly entered, the BASIS will allow edits to the parameters.
After 5 minutes of inactivity, the BASIS will automatically reset the Front Panel Password lockout. Re-entry of the password
will be required to resume editing.
The lockout mode can be deliberately disabled via the “Disable Edits” checkbox in the Front Panel Password menu of the
QSControl software.
LCD Navigation Map (typical)
Left side buttons have screen
dependent functions.
Use rotary data wheel to edit data. Rotate to
move cursor and push to accept change.
Boot Screen
This read-only screen is the
“out of the box” default display after power up. This is
the most desired information
when first setting up a network system. Once user
moves to a different screen,
the last screen accessed
becomes the new power up
Main Menu Screens:
Right side buttons serve
as up/down navigation.
Arrow characters indicate right side button
context. If additional
menus are available, the
arrow character will be
Utility Menu Screens:
Password Log-in Menu*:
Custom User Menus:
*Note: After successful password entry, all screens with editable parameters will have read
write capability. Without password entry, these screens will
be read-only.
If no faults exist
Getting Started
This section outlines one of the simpler methods of getting familiar with your BASIS and the software. The goal of this
procedure is to get your computer and the BASIS connected and communicating and the software installed and running.
After the software is installed and running, refer to the software’s Help file for all software related operation/issues. Note! The default
password for the BASIS is “qsc” (no quotes, lower case).
1- Turn off the computer and unplug the power cord from the BASIS 902zz.
2- Connect a CAT-5 crossover cable from the computer’s network interface card (NIC) to the BASIS QSControl jack (example 1, page 6).
3- Reconnect the power cord to the BASIS 902zz (turn it on). Using the BASIS LCD display and controls, navigate the menu to the IP
Address and make a note of it. In steps 12 and on, you will need to change the IP address of the BASIS or your PC.
4- Turn on the PC and start Windows. You must have Administrator rights and be signed on as Administrator in order to install the
QSControl program. Ensure you are signed on to the computer as the Administrator.
5- Place the CD-ROM in your CD-ROM drive. The install wizard should start. If not, you can also select Start then Run
and browse for the file named setup.exe from the CD.
6- The installer queries the computer for available drive space and other information. If required MDAC library (Microsoft) files are not
already on the computer, the library files are installed. You must accept the Microsoft software agreement in order to install the MDAC
library. It may be necessary to reboot the computer after library installation.
7- At the prompt for “Client/Server” selection, keep both Client and Server selected. This will be appropriate for general use.
8- When prompted “Select Installation Folder”, specify the installation directory or accept the default location.
9- You will be prompted to select an installation accessible by everyone (non-secure) or an installation accessible only to you (secure).
Select the appropriate Everyone or Just Me box and continue. Installation proceeds.
10- Reboot only if your computer prompts you to do so.
11- Right click on the My Network Places icon on your computer’s desktop. Select Properties. Select Local Area Connection, and
view its properties (click Properties tab). Highlight the Internet Protocol Properties tab and view its properties. You will see an
entry field for the IP address. Decide whether you want to change the IP address of your computer to be similar that of to the BASIS
(easiest if you have many BASIS units) or if you want to change the IP address of your BASIS to be similar to that of the computer. This
is a network management decision.
12- Change the IP address of the BASIS (or computer) to be compatible with that of the computer (or BASIS). Typically, this is done by
making the IP address of one of the devices 1 digit different in the last octet (group of digits in IP address). If changing the computer’s
settings, write down the current values, in case you want to revert later.
13- The subnet mask address should be exactly the same for both the computer and the BASIS. The Gateway address should not be
altered as it is not used.
14- After you are satisfied with all your settings, close all open windows and start the program. Select Start, Run,,
15- The login screen should open. The default password is “qsc” (lower case, no quotation marks). Select “Logon to Local Computer”
and click OK.
16-The Venue Manager window will open.
Getting Started (continued)
17- Select Device, Add New Device, from the menu. A new window will open prompting you to name the device. Name it logically,
such as BASIS 1, or similar. Select the Device Type and select BASIS 902zz. At the Password prompt, enter “qsc” (lower case, no quotation marks). This is the device password, separate from the software password. The default, in both cases, is “qsc”, but you are free to
change either or both. Enter the IP address of the BASIS and click OK.
18- The BASIS will now appear in the inventory root (left side of screen). If the BASIS does not show in the inventory root, check that a
crossover cable is used (only for BASIS connected directly to PC), check the cable connections, verify IP addresses are set correctly, verify Subnet masks are set correctly, and verify AC power is properly applied to the BASIS.
19- Click on the BASIS 902zz in the inventory root. A view of applicable device tabs will open. Click the DSP tab and the current DSP
configuration of the BASIS will be displayed.
20- Right click on the Design Editor icon in the lower left of your display; select “New”. A new window opens; select BASIS 902zz for
the device type.
21- Click on Help to access the software’s Help system. All software operation is covered in the on-line help file.
Operation of the BASIS 902zz is accomplished with the included software. No software operation is covered in this hardware manual. After installing your software, open the Help file
and follow its recommendations. The software Help file includes the most recent information available for your BASIS 902zz.
QSControl Port
The QSControl port operates on a 10BaseT Ethernet network. This port is one of the primary means for connecting to the
BASIS. The port may connect directly to a PC's 10BaseT or 10/100 (auto-sensing or auto-negotiating) network interface card using a
crossover cable. Data from the QSControl port may also pass through network repeaters, network switches and routers. We strongly
recommend the use of network switches to facilitate higher bandwidth and dedicated connections.
CobraNet Port
The CobraNet port operates on a dedicated 100BaseTx (Fast Ethernet) network. The CobraNet port may connect directly to a PC's
100BaseTx or 10/100 (auto-sensing or auto-negotiating) network interface card using a crossover cable for the purposes of configuration when the BASIS 902zz is in the single-wire interface mode. During normal operation (passing audio) the CobraNet port must connect to a 100BaseTx or 10/100 or 10/100/1000 (auto-sensing or auto-negotiating) switch port. Optionally, the BASIS 902zz may connect
to another CobraNet port using a crossover cable. When the BASIS 902zz is operating in the two-wire interface mode (described in following sections), the CobraNet port may be connected to a network repeater. Regardless of the interface mode, all CobraNet audio data
must pass through only network switches or only network repeaters. Combinations of these devices will cause unreliable operation and
are not supported. Likewise, the use of routers, gateways and ATM devices are not supported for the CobraNet audio path.
CobraNet Channel Density
The BASIS 902zz will support the acquisition of up to 32 channels via up to 4 inbound bundles (from the network). Of these 32 channels,
any 24 may be selected to forward to the signal processing chain (DSP engine).
The BASIS 902zz will support the delivery of up to 32 channels via up to 4 outbound bundles (to the network). Of these 32 channels, up
to 24 may be unique (processed individually... or the result of mixed signals from the DSP engine). The remaining 8 channels (if used)
will be copies of other channels.
CobraNet Channel Resolution
All CobraNet audio will be processed internally within BASIS 902zz at 24-bit resolution. The BASIS 902zz may receive any valid resolution off of the network. This is currently 16-bit, 20-bit and 24-bit. Audio via inbound bundles may be in any combination of these resolutions and the BASIS will process the data accordingly. All DACs will process 24-bit audio, though the least significant bits may be zero
filled if the inbound audio format is less than 24-bit resolution.
The BASIS 902zz will support outbound (sourced onto the network) resolutions of 16-bit, 20-bit and 24-bit. The default outbound resolution is 20-bit.
CobraNet Terms and Conditions
Single-wire interface offers the best efficiency and ease of network configuration for most applications. The single-wire interface
requires fewer network ports and less cabling. Single-wire interface refers to CobraNet audio, CobraNet control and monitoring and control and monitoring using the same network connection. This mode uses the CobraNet connection to provide all data
communications to the BASIS product. In this mode, the port must connect to a 100BaseTx or 10/100 or 10/100/1000 (auto-sensing or
auto-negotiating) link partner. Network repeaters will not be supported and all audio must pass through network switches only. A
QSControl Venue Manager PC may connect to the network via a repeater or router.
Two-wire or dual-wire interface offers the greatest versatility in network design. Separate connections allow discrete networks
and offer support for WAN topologies on the Two-wire or dual-wire interface refers to CobraNet audio having a
dedicated network link and QSControl control and monitoring having a dedicated network link. In this mode, the two ports (CobraNet
and QSControl) must be connected to separate networks. By separate networks, we mean either physically separate hardware or the
use of common hardware with partitioned or segmented network domains such as the use of VLANs, domain bubbles or separate port
clusters. The dual-wire interface may support dissimilar network hardware for the two port connections (see rules above for CobraNet
and QSControl port connections).
Utility/Diagnostic Functions
Safe Mode Switch
Location of Safe Mode switch: The front panel has a small access hole on the left side, just left of the Power indicator. It is not
labeled to help prevent accidental use. The Safe Mode switch can be operated by using a paperclip (or similar item) inserted into
the access hole and pushing.
Safe Mode: Use if the BASIS 902zz becomes inoperable (or behaves in completely unexpected ways) after updating
If the BASIS 902zz operates in an unexpected way or is not responding to any communications after a new firmware file is
uploaded to it, it is likely the file was corrupted during transfer. If this occurs, there is a “backup” program in the BASIS 902zz that
will enable you to communicate with it.
How to put the BASIS 902zz into Safe Mode:
1- Turn off the power to the BASIS 902zz by unplugging it from the AC outlet.
2- Depress the safe mode switch and keep it depressed while plugging the unit back in (power on).
3- The BASIS 902zz is now in “safe mode”. You may release the switch.
You should now be able to re-establish limited TCP/IP communications with the BASIS 902zz. Once communication has been reestablished, the file transfer can be tried again or the old application file used until the source of the data transfer problem can be
found. Also, WILL NOT communicate with the BASIS 902zz if it is in “safe mode”. You may communicate only using
TFTP, Telnet, or RS-232.
RS-232 Serial Port I/O Interface
The RS-232 connector on the rear panel is used as a serial port input/output (I/O). This I/O port is used for accessing Ethernet/IP
settings, stand alone control capabilities, system “health” data, firmware version information and other related data.
Should any system problems arise, the data that may be accessed through this interface can help to track down the problem. The
most common items that might be used are “Display Network Settings” and “Enter Network Setup”. Many of the remaining selections would typically be used for troubleshooting purposes along with a QSC technical representative prompting you to access particular menu items so the data can be interpreted.
Connection is made using a normal serial cable between your computer’s serial port and the RS-232 port of the BASIS 902zz. Once
properly connected, a “dumb-terminal” program (such as Hyper Terminal, a widely used version on most Windows-based PC’s) is
started and communication established between the PC and the BASIS 902zz.
Following is the basic procedure for starting up Hyper Terminal, naming the connection, specifying the communications settings
and an example of “what you should see” for a text-menu once the communications link has been established. If programs other
than Hyper Terminal are used, you will need to follow your software’s instructions for establishing communications through your
PC’s COM (serial) port.
Utility/Diagnostic Functions (continued)
RS-232 Communications Procedure:
1) Connect the RS-232 port of the BASIS 902zz to an unused serial port (COM port) of a PC using a normal (straight through) serial
2) Open the HyperTerminal program. This program is usually started by clicking the Windows Start icon, selecting Programs, then
Accessories, Communications, and finally, highlighting the Hyper Terminal folder and clicking on its icon.
3) After starting Hyper Terminal, a Connection Description window will pop-up. It will require that you name your connection.
Enter a name for your new connection (example: BASIS 902zz) and click OK to continue.
4) Next, Hyper Terminal needs to know how to “talk” to the BASIS 902zz. This selection depends on which port on your PC the cable
is connected to. Ignore the first three entry fields (phone number information) and go directly to the Connect using entry field and click
on the down arrow for the drop-down menu selection. Select the port the BASIS 902zz is connected to and click OK to continue. The
Properties window should appear next.
5) The Properties window for the selected COM port should now be active. For the Port Settings, use the following information so
communication between the BASIS 902zz and the computer is in the same “language”.
Bits per Second: 9600
Data Bits: 8
Parity: none
Stop Bits: 1
Flow Control: Xon/Xoff
Once you have set the properties as outlined, click OK to continue. If all the connections and communications settings are correct, the
main Hyper Terminal window will open.
6) The Hyper Terminal main window will appear next, but blank. Type the letter “h” (for help) and then press the“Enter” key. This will
prompt the BASIS 902zz to post its menu text. The “h” key is the Help prompt for the BASIS 902zz. A text menu will appear. This is sent
by the BASIS 902zz and will detail your options and instructions for changing the address information.
From this main-menu you will need to make your menu choices and follow the instructions in the following sub-menus or screens.
Although many of the instructions and tests may not pertain to a specific setup or troubleshooting situation, you may be asked to run
certain tests by a QSC technical representative. The results of these tests will help to troubleshoot any problems.
The most common user item that might require settings to be changed would be the IP address information. This would be useful if the
IP address was inadvertently changed to an unrecognized address and subsequently you were unable to “talk” to the BASIS 902zz over
the network. This situation would require the Display Network Settings and Enter Network Setup items to be accessed for reassigning a valid IP address.
Utility/Diagnostic Functions (continued)
Telnet Access
The RS-232 features can also be accessed via Telnet. The Microsoft Telnet application is a Windows program. Consult Windows
documentation for Telnet information.
Basic procedure for opening a Telnet session:
1- To open the Telnet session- Click Start, select Run, type “Telnet” followed by a space, then the IP address of the BASIS 902zz
you want to communicate with in the text box and click OK.
2- If the address entered was correct and network communications with the BASIS 902zz are successful, the Telnet session should
3- Now you have the same options that are available in the Serial Port I/O (RS-232) interface section.
Preliminary Specification
Dynamic Range (AES-17, -60dB Method, all sensitivities)
A weighted
Distortion (20Hz-20 KHz, all sensitivities)
+4dBu (max)
2dB below clip (max)
<0.009% THD+N
<0.009% THD+N
Crosstalk (20Hz - 20KHz)
inter-channel (max)
inter-channel (typ)
intra-channel (max)
intra-channel (typ)
Frequency Response
20Hz - 20KHz (max)
20Hz - 20KHz (typ)
+/- 0.5dB
+/- 0.2dB
Audio Converters
24 bit, 48KHz (output)
infinite attenuation
Network to BASIS
CobraNet input through full DSP chain to analog output
Program Outputs
Connector Type
Cable Type
Available “stock” Lengths
Maximum Qualified Length
Control Room Foldback Monitoring
Connector Type
Tap points
Monitor Input
Monitor Signal (unit off)
Maximum level
Impedance (nominal)
CMRR, 20Hz-20KHz
Standard CobraNet Latency
Low Latency
6.313 milliseconds
3.646 milliseconds
4 HD-15 dataport connections
QSC DataPort cable, QSC p-n DPC-x (“x” designates cable length in feet)
1, 2, 3, 4, 5, 6, 10, and 20 ft., custom lengths available.
32.8 ft. (10 m)
5-pin "Phoenix Style" (a.k.a. "Euro Style") detachable terminal blocks
1:+(input) 2:-(input) 3:CHASSIS GND 4:-(output) 5:+(output)
8 internal input, 8 internal output, 8 amplifier (pre-, post-, amplifier) software
Unity gain connection, relay bypass
+21 dBu
10K ohms
>54 dB
Specifications are subject to change without notice.
Preliminary Specification
Monitor Output
Freq. Resp. 20Hz-20KHz
Distortion (20Hz-20KHz)
Noise Floor
Output Impedance (nom)
Output Load (min)
Sum of Monitor Input and signal from internal monitor tap point(s)
+/- 0.5dB
<0.05% @ +4dBu
100 Ohms
600 Ohms
Monitor Level
Control Range (nom)
0dB to -95.5dB in 0.5dB steps
Relay Outputs
Connector Type
Switching Capacity (nom)
2 discrete floating relay switch outputs
3-pin "Phoenix Style" (a.k.a. "Euro Style") detachable terminal blocks
Electromechanical Relay
1:NC 2:NO 3: COM
1A 30VDC
Logic Outputs
Connector Type
4 discrete outputs
2-pin "Phoenix Style" (a.k.a. "Euro Style") detachable terminal blocks
Single-ended, TTL compatible
1:+(Signal) 2:-(CHASSIS GND)
Omni Inputs
Connector Type
Normal Operating Range
Potentiometer Operation
Voltage Tolerance
Current Output
6 discrete inputs for TTL logic, voltage control or passive resistive
2-pin "Phoenix Style" (a.k.a. "Euro Style") detachable terminal blocks
Single-ended, ground referenced
1:+(Signal) 2:-(CHASSIS GND)
Reads signals between 0-5V nominally
Use 10K for full range
+/- 48V
0.5mA with 10K pot (for passive resistive controls)
RS-232 Port
Female DB9 Connector
Neutrik Ethercon RJ45 Ruggedized Data Connector
Neutrik Ethercon RJ45 Ruggedized Data Connector
QSControl Status
CobraNet Status
DataPort Status (Port)
LCD Data Display
Yellow Link, Tx, Rx, front panel / Green Link, Tx, Rx, rear panel
Yellow Link, TX, RX, front and rear panel
Blue, front panel
Red, front panel
Tri-state (red, green, yellow), front panel
2 line x 16 character, backlit, front panel
Specifications are subject to change without notice.
How to Contact QSC Audio Products
Mailing address:
QSC Audio Products, Inc.
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 USA
Telephone Numbers:
Main Number
(714) 754-6175
Sales & Marketing
(714) 957-7100 or toll free (USA only) (800) 854-4079
Customer Service
(714) 957-7150 or toll free (USA only) (800) 772-2834
Facsimile Numbers:
Sales & Marketing FAX
(714) 754-6174
Customer Service FAX
(714) 754-6173
World Wide Web:
[email protected]
[email protected]
Warranty Disclaimer (USA only; other countries, see your dealer or distributor)
QSC Audio Products, Inc. is not liable for any damage to amplifiers, loudspeakers, or any other equipment that is caused by negligence
or improper installation and/or use of this signal processing product. While QSC has endeavored to develop and produce the most
dependable and robust 'network' audio product for your use, due to the myriad of network situations and equipment that may be
encountered in its implementation, QSC cannot be held responsible for network conflicts and associated consequences that may result.
For this reason, QSC strongly recommends that the network used for implementation of QSControl products be completely separate
from all other networks, data or otherwise. As such, should you elect to integrate QSControl products with your existing network system, all risks attendant to such integration of QSControl products with your existing network or network systems are assumed by you.
While QSC strives to provide the highest quality technical solutions for networked audio products, in no event will QSC or its suppliers
be held liable for any damages, consequential, incidental or otherwise, including any claims for lost profits and/or savings resulting
from any attempted integration of QSControl products with your networking systems. No agent, employee or representative of QSC has
any authority to alter or modify in any manner, the disclosures and recommendations set forth herein.
QSC Audio Products 3 Year Limited Warranty
QSC Audio Products, Inc. ("QSC") guarantees its products to be free from defective material and / or workmanship for a period of three
(3) years from date of sale, and will replace defective parts and repair malfunctioning products under this warranty when the defect
occurs under normal installation and use - provided the unit is returned to our factory or one of our authorized service stations via prepaid transportation with a copy of proof of purchase (i.e., sales receipt). This warranty provides that the examination of the return product must indicate, in our judgment, a manufacturing defect. This warranty does not extend to any product which has been subjected to
misuse, neglect, accident, improper installation, or where the date code has been removed or defaced. QSC shall not be liable for incidental and/or consequential damages. This warranty gives you specific legal rights. This limited warranty is freely transferable during
the term of the warranty period.
Customer may have additional rights, which vary from state to state.
In the event that this product was manufactured for export and sale outside of the United States or its territories, then this limited warranty shall not apply. Removal of the serial number on this product, or purchase of this product from an unauthorized dealer, will void
this limited warranty.
Periodically, this warranty is updated. To obtain the most recent version of QSC's warranty statement, please visit
Contact us at 800-854-4079 or visit our website at
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA
©2004 “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.
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