QSC Audio CM16a Home Theater System User Manual

QSC Audio CM16a Home Theater System User Manual
Amplifier Network Monitor
Rev. B
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
© Copyright 2001, QSC Audio Products, Inc.
QSC® is a registered trademark of QSC Audio Products, Inc., Costa Mesa, CA
“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office
“HyperTerminal” is the copyrighted property of Hilgraeve Inc., Monroe, MI
“Phoenix Contact” is the trademark of Phoenix Contact, Inc., Middletown, PA
“Riacon” is the trademark of RIA electronic, Inc., Eatontown, NJ
“On-Shore Technology” is the trademark of On-Shore Technology, Inc., Tempe, AZ
All other trandemarks are the property of their respective owners
TABLE OF CONTENTS: CM16a Amplifier Network Monitor
Physical Characteristics & Layout........................................................6
List of Functions & Features...................................................................8
Block Diagram.........................................................................................9
Detailed Description of Functions.......................................................11
Network Description.............................................................................14
Network Examples................................................................................15
What is Included.................................................17
Location Considerations....................................17
Mounting the CM16a..........................................17
AC Power..............................................................18
Audio Inputs.........................................................19
Page Input............................................................20
RLY/TRG Input......................................................20
RLY Output............................................................20
Monitor Chain In/Out..........................................20
10BASE-T Input/Output........................................21
RS-232 Port...........................................................21
Rear Panel Detailed Illustration & Hookup Example........................22
Section 3: OPERATION
LED Behavior........................................................23
Amp Setup, Network Setup...............................24
BYPASS Switch Usage......................................26
Serial Port Interface...........................................27
Telnet Access......................................................30
Fuse Replacement...............................................31
Section 4: SPECIFICATIONS.......................................................................................................................................32
Section 5: ARCHITECT’S & ENGINEER’S SPECIFICATION..................................................................................36
Section 6: APPENDIX
Ethernet Cable & RS-232 Pinouts ........................................................37
DataPort Pinout and “Phoenix”-type Connector Part Numbers......38
How to Contact QSC Audio Products..................................................39
Important Safety Information! Please review the following important
safety information before operating the CM16a.
Explanation of Graphical Symbols
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 users to the presence of important operating and
maintenance (servicing) instructions in the literature accompanying the product.
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
WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture.
1- Maximum operating ambient temperature is 50°C
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 CM16a 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.
Federal Communications
Commission (FCC)
NOTE: This equipment has been tested
and found to comply with the limits for a
Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a commercial installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in
accordance with the instructions, may
cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause
harmful interference, in which case the
user will be required to correct the interference at his or her own expense.
Section 1: Introduction- Overview
The QSC CM16a Amplifier Network Monitor provides power-
The DataPort connections are made with ordinary VGA
ful amplifier management and zone paging capability in a
computer monitor-type cables (HD-15 male-to-male).
QSControl networked audio system using Ethernet network-
These cables are the same type that are used on personal
ing technology to communicate with the host computer/
computer systems to connect the monitor to the computer.
system controller.
This allows you to use commonly available cabling for
interconnecting amplifiers to the CM16a. Each DataPort
connection supports the control and monitoring functions
The host computer uses the QSControl application software
for two audio channels. When using the CM16a with
to operate the networked audio system, including the CM16a’s
amplifiers that have more than two channels (such as the 4
and their amplifiers. The software operates on the Microsoft
channel cinema amplifiers) additional DataPort connections
Windows NT® version 4.0 operating system and can be
are required.
customized using Microsoft® Visual Basic Professional Edition.
The CM16a is a control and monitoring device that relies on
software to do its job. The functions and capabilities proThis manual outlines the capabilities of the CM16a as well as
vided in the design of the CM16a can only be realized with
its installation and connections. The operation of the CM16a
proper software implementation. Keep in mind that this
is accomplished using QSC’s QSControl software. Note that
manual’s intent is to outline these capabilities and provide
not all hardware features may be supported by the current
a reference for properly installing and interconnecting the
software revision. Please refer to the software’s documenta-
CM16a to the networked system’s host computer, the audio
tion & help file for information regarding software features,
inputs and the amplifiers to be controlled and monitored. A
usage and functions.
thorough knowledge of the control software’s features and
operation will provide the best possible results for the end
Each CM16a performs control and monitoring functions for up
to 16 amplifier channels. This could be up to eight 2-channel
From all of us at QSC Audio Products, thank you for your
or four 4-channel amplifiers (or some combination of these) at
the time this document was printed. The amplifiers supported
by the CM16a are the PowerLight, PL2, PL2A, DCA, and CX
series of QSC amplifiers that have a built-in Data Port. Models
that do not have a built-in DataPort or models that have a DP1 option or “V2” DataPort (such as the EX, MXa, & ISA
series) are NOT supported by the CM16a.
PL2A amplfiers have programmable filters and
crossovers. This makes gain “reporting” to the host unreliable as the frequency content relates directly to reported
output levels. Since the output level is used to calculate
gain, it is not possible to gaurantee accurate gain reporting
when the PL2A is set for any of its various frequency boost/
cut/crossover modes.
Section 1: Introduction- Physical Characteristics & Layout
The CM16a is one rack space high (1RU) and has an internal, univeral 100-240V AC power supply. The chassis is 37.7 cm (14.84”) deep.
The width of the chassis, less rack ears, is 43.7 cm (17.20”). For detailed mounting dimensions, refer to the Section 4: SpecificationsDimensions (page 32). The weight of the CM16a is approximately 5 kilograms (11 pounds).
FRONT PANEL (numbers correspond to reference locations shown in illustration above)
POWER switch
Cooling air exhaust vents (intake vents are located on left side of chassis as viewed from the front)
POWER on indicator
DIAGNOSTIC indicator
RCV, XMT and LINK STATUS network status indicators
PORT A - PORT H connection indicators
Access hole for the BYPASS switch (this is not labeled on the panel)
Section 1: Introduction- Physical Layout Diagram
REAR PANEL (numbers correspond to reference locations shown above)
DataPort connectors PORT A - PORT H
PORT A CH 1 - PORT H CH 16 three-pin receptacles for audio inputs
PAGE three-pin receptacle for paging audio signal input
MONITOR CHAIN, IN and OUT five-pin receptacle for audio monitoring functions
RLY / TRG IN two-pin receptacle for remote sensing of switch closure or logic event
RLY OUT three-pin receptacle for output terminals of CM16a’s internal SPDT relay contacts
RCV, XMT and LINK STATUS network status indicators
10BASE-T RJ-45 Ethernet computer network connection
RS-232 port for network and firmware utilities
IEC-type detachable AC power cord receptacle (for connection to AC line cord) with integral fuse holder
Section 1: Introduction- List of Functions & Features
The CM16a performs remote control and monitoring of amplifiers. Below is a listing of the functions available for the supported QSC
amplifiers. The following two pages (Block Diagram part 1 & 2) illustrate the main functions of the CM16a. Following the diagram is a section
giving detailed explanations on each functional block that will aid in the use of the CM16a. Note that not all features may be supported
by the current revision level of software (consult software documentation for supported feature set). Where applicable, functions are
available on each individual audio channel.
Amplifier: Power (Standby/Operate Control)
Input Sensitivity Select
Input Source Select (Normal/Page)
Signal Level Control
Signal Mute
Signal Polarity Select
Paging Control (with customizable routing)
Contact Closure Output (switching of internal relay for control of external device)
Paralleling within DataPort Pair
Amplifier: Power Status
Amplifier Gain
Amplifier Model
Bridge Mode
Load Monitor (impedance)
Protection Status
Output Voltage
Output Current
Output Power (real)
Heat Sink Temperature (with Over-Temp.)
Clipping Detect
Output Short
Output Open
Input Level Meter
Output Level Meter
Audio Monitor Module (4 channel mono. mixer)
External Event Sensing (a logic-level or switch input)
DAC (digital-to-analog converter) that can be used for generating test signals
RS-232 Port for setting of network address information and system diagnostics
TFTP upgradeable firmware via Ethernet
Section 1: Introduction- Block Diagram (part 1)
Section 1: Introduction- Block Diagram (part 2)
Section 1: Introduction- Detailed Description of Functions
Audio Inputs- These are the 3-pin terminal block connectors
Pre-Fader Monitor- Monitors the audio path at the point
used for balanced line level audio-signal input. This type of
before the Level Control block (i.e. the input to the CM16a).
connector is sometimes called“Phoenix”or “Euro” style.
Post-Fader Monitor- Monitors the audio path at the point
Input Sensitivity- Sets the sensitivity of the Audio Inputs to
after the Level Control, Mute, and Polarity blocks (i.e. the
either 1 Volt or 3 Volts (r.m.s.). This selection should coincide
output from the CM16a).
with the level of the audio signal provided for each channel.
Input Source: Normal/Page- Selects the input source for
each channel. Normal input is the audio connected at the
Audio Input terminals. Page input is the audio provided by the
Paging Input Module.
Level Control-
Provides adjustment of the signal level
delivered to the amplifier for each channel. Adjustment is from
-95.5dB to 0dB in 0.5 dB steps.
Meter-These points are indicators of where in the audio path
the software can “meter” the audio.
Amplifier Monitor- Monitors the audio at the output of the
amplifier (i.e. the speaker terminals of the amplifier).
Off- This selection disconnects the monitor for the channel.
Level Adjust- Provides adjustment of the signal level delivered to the Monitor Module from each of the selectable “tap”
points of a channel’s audio path. Adjustment is from -95.5dB
to 0dB in 0.5 dB steps.
Monitor Module- This module functions as a four-input
mixer with software selection of the input channels. The four
selected channels are summed with the external input,
Mute- Actively mutes the audio signal being passed by a
Monitor Chain In. For each of the inputs, the “tap” point is
channel. No signal is delivered to the amplifier when a channel
selectable from the pre-, post-, amplifier and off positions.
is muted.
Parallel Mode- When parallel mode is selected, the input to
the first channel is also applied to the second channel. When
in parallel mode, the input is ALWAYS from the first (or odd
numbered) input. The second (or even numbered) input is
Standby/ Operate- Controls the amplifier’s power status-
ignored; this includes the PAGE signal. This feature is useful
ON- amplifier operational
for sending one input signal to both amplifier channels without
STANDBY- amplifier in standby mode
having to wire jumpers between the two input connectors.
This mode is automatically enabled by the CM16a when the
amplifier bridge mode is set to any of the parallel modes
NOTE! The amplifier must be powered in order to respond to
available (see amplifier manual for details).
any commands issued by the CM16a. This means the amp’s
Polarity- Determines the polarity of the signal delivered to
power switch must physically be in the ON position.
the amplifier for each channel.
Section 1: Introduction- Detailed Description of Functions
Protect Status Detect- Reports if the amplifier has
Amplifier Model Detect- Identifies what model of
entered “protect” mode (such as thermal, over-current
QSC amplifier is connected to the CM16a’s DataPort.
or power-up muting protect status).
Amplifier Gain Detect- Reports the setting of the
Real Power Detect- Reports the “real” power the
amplifier’s gain setting (in dB) for each channel.
amplifier is delivering. This “real” power is not the
same as “reactive” power. Real power is the product of
Bridge Mode Detect- Detects the position of the
bridge mode switch on each amplifier.
Clip Detect- Detects amplifier clipping on each channel.
current and voltage times the cosine of the phase angle
between them.
Threshold Adjust- This indicates that the behavior of
the associated block requires the input of a threshold
Headroom Metering- Reports the “available” re-
value in software that must be crossed for the detection
maining signal level that the input signal can be driven
to occur. This allows the system operator to tailor the
before clipping will occur.
behavior of the system to each application.
Heat Sink Temperature Metering- Monitors the
heatsink temperature of each channel of each amplifier
connected to the CM16a. If the temperature exceeds a
user specified value (in software) then the Over-Temp.
Input Sensitivity- Sets the sensitivity of the Page
“object” will alert the system operator.
Input to either 1 Vrms or 3 Vrms. This selection should
coincide with the level of the audio signal provided for
Load Monitor Detect- Monitors the impedance of
the Page Input.
the load at the amplifier output for each channel.
DAC- This is a digital-to-analog converter that takes
Output Current Meter- Provides for metering of the
amplifier’s output current on each channel.
and outputs the corresponding analog “equivalent” to
Output Voltage Meter- Provides for metering of the
the appropriate channel PAGE insert points . This oc-
amplifier’s output voltage on each channel.
curs only by instructions issued by the system operator
Output Open Detect- Detects when the load con-
or a custom control application.
nected to the amplifier is above a user specified value
Page Input- This is a 3-pin terminal block connector
in software.
used for balanced line level page audio-signal input.
Output Short Detect- Detects when the amplifier
load is below a user specified value in software.
Power Status Detect- Reports AC power status of
the amplifier (ON/standby/ OFF).
digital information from the internal microcontroller
Section 1: Introduction- Detailed Description of Functions
RS-232 Port- The RS-232 (serial) port is used to
RLY OUT- This is a 3-pin terminal block connector used
communicate with the CM16a for Ethernet address
for remotely controlling an electrical device in an on/off
manner (such as a cooling fan, an audible alarm, a light,
etc.). An internal SPDT (single-pole, double throw) relay
is controlled by software command. Its contacts are
accessible at the rear panel RLY OUT connector and
are labeled:
setup and other diagnostic purposes. Most users will
never have a need to access the RS232 port, but for
customized networks and for troubleshooting system
problems, it may be necessary.
NC (normally closed)
For the RS-232 port utilities, see the Operation
NO (normally open)
section, “Serial Port I/O Interface” which out-
C (common)
lines the proper connection and communication
settings required to communicate with the CM16a
via the serial (RS232) port.
RLY/TRG IN- Detects the closure (or opening) of a
switch connected to the RLY/TRIG IN terminals on the
If the CM16a is connected to an Ethernet network
rear panel. Also accepts CMOS and TTL logic-level
where the factory-provided IP address information is
inputs. An example is the detection of a limit-switch
not acceptable, the IP configuration may be changed
that indicates an open door on an equipment cabinet.
using the RS-232 port. This involves connecting a com-
This input may also be configured to activate (recall)
puter with a properly configured serial port to the
certain presets without the need for a computer. Setup
CM16a using a null-modem type cable (such as a
for this feature is possible using the Serial Port I/O or
“Laplink” cable) and running a dumb-terminal program
Telnet sessions outlined on pages 27 - 30 (ref. menu
(HyperTerminal is the Microsoft® Windows- supplied
item #10).
UNLESS YOU ARE CERTAIN OF WHAT YOU ARE DOING! If addressing is configured incorrectly, the CM16a
may not respond to network control.
Note- The factory-programmed IP address is printed
on a label affixed to the front panel of the CM16a.
Record this IP address in a safe place in case the label
becomes lost.
Section 1: Introduction- Network Description
QSC CM16a Amplifier Network Monitors are designed to operate on standard 10BASE-T Ethernet. Each CM16a operates as a
respective node on its network; each unit contains a programmable IP address in nonvolatile memory. To minimize network conflicts,
each IP address should be unique. When shipped from the factory, the CM16a’s factory-programmed IP address is printed on a label
affixed to the front panel of the unit. Record the unit’s IP address and serial number and keep in a safe place. Ethernet devices such
as hubs, repeaters, switches and routers will usually afford the flexibility to configure the network as needed.
The system controller computer on the network must have an Ethernet-compatible network interface card (NIC) installed.
Additionally, if operation during power outage or interruption is required, an uninterruptable power supply (UPS) will be required for
the host computer , CM16a, and any hubs, switches or repeaters. If the CM16a is disconnected from the network for any reason, it
will continue to process audio using the last settings, assuming AC power is uninterrupted.
The CM16a connects to the network via its RJ-45 connector on the rear panel. This allows direct connection to a 10BASE-T network.
Use Category 3 (or better) unshielded twisted pair (UTP) Ethernet Cable. Most ready-made Ethernet patch cables available today are
rated at least Category 5 making them suitable for this application.
One side note regarding Ethernet cabling: Although Category 3 data cable is called out as the minimum requirement, it is increasingly
difficult to find. Higher grades of cable are becoming the “normal stock” with the proliferation of 100BASE-T Ethernet. Category 5
Ethernet cable is the most widely available type of data cabling as of this writing. So what does this mean? Use Category 3 if it is
available and cost effective. If the cost of Category 5 cable is not prohibitive, it may be desirable to do your cabling runs with Category
5 due to its increased data rate capabilities. The extra capability may be needed for future system expansion where 100 BASE-T
devices are used. 10BASE-T capability is all that is required for the CM16a and thus the call out for Category 3 as the minimum.
Section 1: Introduction- Sample Network Topologies
The simplest network configuration is a single
system controller computer and a CM16a connected by a single Ethernet crossover cable. A
standard Ethernet cable would NOT work. The
crossover-type cable must be used when connecting the CM16a directly to the system controller computer. This type of cable switches
(or crosses over) the transmit and receive signals from one end to the other enabling connection without any intermediate devices. See
page 37 for crossover cable pinouts.
For CAT-3 or CAT-5 distances longer than 100
meters (~300 feet) a repeater must be used. An
active hub or Ethernet switch may be used as
well. Active hubs “clean up” and retransmit the
network traffic, much as a repeater does, only
with multiple ports. The active hub or switch
would allow for future expansion.
If there are two or more CM16a’s in
the network (or other network devices present) use a hub or switch
to create a star topology.
Section 1: Introduction- Sample Network Topologies
Some networks have multiple system controller computers. This configuration is essentially the same as the second example
with the addition of the second computer
attached to the hub or switch.
To create the more complex distributed star
topologies needed for larger systems, use
additional hubs or switches. Some have special uplink ports for connecting to other hubs
or switches via a standard Ethernet cable. If
the hubs or switches do not have uplink
ports, then the hub-to-hub or switch-toswitch connection should use a crossovertype Ethernet cable.
Section 2: Installation- Basics and Mounting
There are no special unpacking precautions for the CM16a. Keep the original packing material for reuse in the rare event that service be
required on the CM16a. If service is required and the original packing material is not available, adequately protect for shipment (strong box
of appropriate size, sufficient packing material to prevent impact damage or load shifting).
1- CM16a Amplifier Network Monitor
2- AC Power Cord
3- One complete set of the “Phoenix”-type connectors (18 pcs. of 3-pin style, 1 pc. of 5-pin style & 1 pc. of 2-pin style)
4- Hardware manual (this document)
Where the CM16a is installed is dependent upon the location of audio input sources, amplifiers and network access. The system controller
computer should be located someplace convenient for the system operator. In most instances, the system controller computer is remote
from the CM16a and the amplifiers . It is preferable to install the CM16a and the amplifiers in the same or adjacent equipment racks; this
allows the cabling between them to be standard 15 pin VGA monitor cables. These cables are generally 2 meters long (6.5 feet). For longer
cabling runs, contact QSC’s Technical Services Department at (800) 772-2834 (toll free U.S.A. only) or (714) 957-7150. QSC offers a special
cable with individually-shielded twisted-pairs for each audio path; this cable can be used over distances as long as 100 meters (328 feet).
The maximum length of any 10BASE-T Ethernet network segment (cabling between any node and the next node, hub or repeater) is 100
meters (328 feet). The location of hubs and repeaters must be such that this distance limit is not exceeded. If this is impractical or impossible,
then use appropriate network transceivers and fiber optic cabling. For larger Ethernet networks, the use of Ethernet routers may be
Note- Rack mounting is optional.
The CM16a is secured to the front of the equipment rack with four screws and washers. Be sure to support the weight of the CM16a when
securing to avoid distorting or bending the front panel mounting ears. For mobile, touring or portable applications, support the rear of the
CM16a using the rear mounting tabs provided or contact QSC’s Technical Services Department to order rear rack ear extensions. The rear
rack ear extension kits add flexibility to you installation options as well as a support-pin option that requires one-time hardware installation
at the rear of the rack. For the locating dimensions of the rear support mounting tabs, see the dimensional diagram in the specification
Section 2: Installation- Mounting and AC Power
MOUNTING THE CM16a (continued): The illustration below, left, shows the basic mounting technique. Support the CM16a from
underneath while positioning the mounting holes in the desired location in the rack. Secure with standard rack hardware. The CM16a uses
fan-drawn air for cooling. The air intake is on the left side of the chassis and the exhaust vents are on the front panel. Be certain not to obstruct
these openings! Allow ample “open space” around them in order to maintain unobstructed air flow.
Note! The CM16a’s recommended ambient operating temperature is 0°C. to 50°C. (32°F. to 122°F.). Do not
install the CM16a in environments that expose it to temperatures outside this range. Some equipment
rack environments can get hot. If there is any question, measure the air temperature inside the equipment rack
and supply additional cooling (air flow) to keep the ambient temperature within the specified limits. QSC amplifiers
use back-to-front air flow and therefore do not exhaust hot air into the rack.
The CM16a uses a detachable IEC standard power cord for connecting to a grounded AC
source. To connect power to the CM16a: identify the proper end of the cord, match the
orientation of the receptacle on the rear panel and insert firmly into the receptacle. The
power supply will accept from 100 to 240 Volts AC, 47 to 440 Hertz, without any changes.
The power cord used must be suitable for the line voltage the CM16a is connected to. If a
different type of IEC power cord is required (different style of plug on the outlet end) contact
QSC’s Technical Services Department to obtain the correct cord assembly.
Section 2: Installation- Connections
The audio inputs are located on the rear
panel. The CM16a uses terminal block
connectors for the audio inputs. They are
“Euro”connectors. These connectors allow the installer to pre-wire the input terminations before the CM16a is installed in
the rack. It also allows for re-routing of
audio inputs by simply interchanging connector locations without the need for any
tools. See Appendix (page 38) for connector manufacturer’s part number reference.
Balanced connection is recommended for all inputs.
The illustrations to the right show the proper connection of audio program input
sources for both balanced and unbalanced inputs.Use balanced connections whenever possible. If unbalanced audio sources are used, it is preferable to use an
appropriate audio transformer (or other unbalanced-to-balanced “converter”) to
provide a balanced input to the CM16a. If this is not possible, then it is recommended
the negative terminal and shield terminal be connected to one another with a jumper
Terminal Block Connector HintsStrip length : 6 to 8 mm ( 1/4 to 5/16 inch) .
Be careful not to nick or cut the conductor strands .
After each conductor has been stripped, insert it fully into the connector
and tighten the retaining screw. When stranded wire is used, carefully
twist the conductor strands together so when they are inserted into the
connector assembly, no loose strands short adjacent terminals.
For heavy-duty input cables, the use of connectors with integral strain relief
is recommended. These connectors have a large plastic tab molded as part
of the assembly which provides an area to tape or tie-wrap the cable to. At
the time of this writing, only the 3-pin with the strain relief was available
through QSC . See Section 6 (Appendix) for connector part numbers.
Section 2: Installation- Connections
The PAGE input connections are the same as the AUDIO INPUT
connections. Please refer to the previous page for connector
The RLY/TRG IN connector is a two-pin terminal block connector. When using this input for a switch-closure (or opening)
event, the two terminals should be connected to the switch
contacts directly. This type of event detection can be used with
relay contacts as well.
If used with a logic-type device, the low-end of the logic
connection should be connected to the minus (–) terminal and
the active-end should be connected to the plus (+) terminal.
This input is compatible with TTL & CMOS logic family devices. For the defined limits of input to this connector , please
refer to the specification section.
TIP- This input can be used to switch between
stand-alone preset operating modes without the
need of a computer. Setup for this feature is available through RS-232 or Telnet communications.
The RLY OUT connector provides access to the internal relay’s
The MONITOR CHAIN connector is a 5-pin terminal block con-
contacts for remotely controlling an external low voltage device
nector. The center pin is the shield connection for both the input
or circuit. This internal relay is rated for 70V (DC or ACrms), 250
and output of the monitor chain. Note also that the positive
mA (switched) and is isolated from ground. There is one common
terminal of the input and output connections are on the outer
terminal, one normally-closed contact terminal and one nor-
pins of this connector.
mally-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.
higher voltage or current levels with the CM16a, contact Technical Services for suggested solutions.
Section 2: Installation- Connections
CONNECTION TO 10BASE-T (network connection)
Connection to the Ethernet network is made using the RJ-45 type
connector labeled 10BASE-T on the rear panel.“RJ-45” is the
standard network connector for Ethernet networks. Insert the RJ45 plug into the receptacle with the lock-tab oriented toward the
bottom of the CM16a and push firmly until the connector locks
into place (usually an audible “click” can be heard). Refer to
Section 1 of this manual for Ethernet connection schemes and
cabling. If the CM16a is connected directly to the system controller computer’s network interface card, a crossover type cable is
required. All other connection methods utilize normal Ethernet
Connection is made with a null-modem serial cable with a DB-9
male plug to the CM16a. The RS-232 port can be used for setting
various operational parameters that are CRITICAL to proper
operation of the CM16a. The network address settings can be
changed through this port. Do Not Change the Network
Address unless you are certain of what you are doing!
Refer to Section 3 (page 27) for more information.
2-channel amplifiers require a cable connection from the amp’s
Two basic rules must be adhered to:
DataPort to the appropriate PORT receptacle on the CM16a.
First, both DataPorts of the amplifier must be used.
These HD-15 type connectors are labeled PORT A through PORT
H. Use standard 15 pin VGA monitor cables (the same type of
cable that interconnects PC’s & monitors).
To connect the cable to the CM16a, orient the HD-15 connector
with its wider-side down (look at the connector, one side of the
plug’s metal surrounding is wider than the other) and align it with
the receptacle, then gently push into the receptacle until it is
firmly seated. Use the retaining screws on the cable ends to
secure the plug to the CM16a and the amplifer. Tighten “finger
tight” to avoid damage to the HD-15 receptacle. The same basic
procedure applies for connecting the other end of the cable to the
amplifier’s DataPort.
Second, both must be connected to the same CM16a.
If only one DataPort connection is used, the CM16a will not
control or monitor the amplifier correctly (the same applies for
connecting the two amplifier DataPorts to two separate CM16a’s;
the system will not function properly). Insure that both amplifier
DataPorts are used and that they are connected to the same
CM16a. You do not have to use adjacent ports on the CM16a (i.e.
PORT C and PORT D). You can use any two ports for convenience;
the only impact of doing this is that the System Manager
software control panel will not show all four channels next to
each other.
Section 2: Installation- Rear Panel Detail
Section 3: Operation- LED Indicators
LED Indicators- When the power is switched “on”, all of the LED’s light briefly and then the PORT LED’s sequence through two patterns.
The LED’s then resume normal operation. The LED functions are described below.
This indicator illuminates when the CM16a power switch is in the “on” position.
This indicator illuminates during the power-on self test, then should turn off. If it
remains illuminated, this indicates that the self-test has detected an unexpected event,
such as a corrupted firmware update via TFTP or a memory boot failure. If the
DIAGNOSTIC LED remains illuminated, try resetting the CM16a by cycling power off and
on once. Should the indication persist, contact QSC’s Technical Services for guidance.
There are three LED’s on the front and rear panels labeled RCV, XMT and LINK STATUS.
Their functions are described below.
RCV- This LED lights up any time the CM16a receives data over the network.
XMT- This LED lights up whenever the CM16a transmits data over the network.
LINK STATUS- When lit, this LED indicates that the CM16a is connected to an
operating Ethernet network.
If not lit, there is most likely a cabling problem between the CM16a and the hub or
possibly a fault in the hub.
These LED’s are labeled PORT A through PORT H on the front panel. The respective LED
will illuminate when functional connection has been made between the CM16a and an
amplifier. The amplifier’s power does not have to be ON in order for the LED to indicate
successful connection.
Section 3: Operation- General Information & Presets
AMPLIFIER SETUP- The amplifiers connected to the CM16a
The presets are useful tools, but Preset 0 acts differently than the
must have their power switches in the “on” position. For initial
others. Each time the CM16a is powered up, it recalls its settings
testing, it is advisable that the amplifiers be set for the lowest
from Preset 0. The factory Preset 0, discussed above, is a muted
useful gain (volume) setting until it is verified that the system is
state with amps in STANDBY mode. When setting up your own
operating as expected. After the system setup has been verified
presets, they should be stored in Preset 1 through Preset 15. See
and tested, gain settings may be set as required.
next page for notes regarding Preset 14’s use as a “scratchpad”.
NETWORK- The network should be operable and QSControl
The reason for not actively using Preset 0 is as follows:
software should be installed/running on the system controller
Let’s say you’re operating your system in Preset 12 and you
change the setting of one fader. The new setup is NOT the same
CM16a OPERATION- To turn the CM16a on, press on
the upper portion of the power switch. The green
colored POWER LED will illuminate when the power
switch is in the “on” position. If not, verify that the IEC
power cord in properly connected to the unit and to an
operating AC source between 100 and 240 volts.
as Preset 12, so the CM16a starts a 4 minute timer from the
time the control was changed. After the 4 minutes has
elapsed with no further control changes, it saves the
NEW scene into Preset 0 . Preset 12 is left unchanged.
Whatever was in Preset 0 is now gone forever. This insures that
the next time the CM16a is powered up, it’s settings are the same
as you left them. Remember, the CM16a always powers up
Operation of the CM16a is accomplished with QSControl soft-
in Preset 0. Refer to the software documentation for further
MODES- It is important to understand the start-up behavior
Preset 0 will only be overwritten 4 minutes after the last
outlined below. Some of the terminolgy is specific to QSControl
one of its BYPASS modes as discussed in the following
software; refer to the software’s helpfile for detailed informa-
section. If the CM16a is placed into BYPASS mode and operated
for at least 4 minutes without control changes, then the BYPASS
When first taken out the box, the CM16a will power up in
mode is saved in Preset 0. The next time the CM16a is powered
a muted state with all faders at -95.5 dB., polarity set to normal,
up, it will start up in Preset 0 (or BYPASS in this case). This could
sensitivity set to 3V, and any amplifiers connected to the CM16a
cause dangerously high output levels from the system.
will be in STANDBY mode. This “setup” is the factory setting.
Insure amplifier gain controls are reduced to safe levels
control change. This includes if the CM16a is placed into
ANY time BYPASS mode is used.
PRESETS- The CM16a has 16 Presets for quickly recalling
settings. They are numbered 0 (zero) through 15. These presets
The CM16a has all outputs momentarily muted at power-up to
are useful for quickly changing from one setup to another without
prevent unexpected audio pops, clicks or thumps. Remember: At
having to change each individual control to a new setting. An
power up, the CM16a will always start operating with the
example might be in a house of worship where the audio system
settings saved in Preset 0. Once network communication has
setup is different for each service. Instead of having to keep a
been established between the host computer and the CM16a,
trained system operator on location, another individual with
the CM16a may be controlled remotely . In the event that the
minimal training can be shown how to change to the desired
network communications link is lost while the CM16a is
preset for each situation.
operating, it will continue to operate with its last settings
Section 3: Operation- Recalling Presets Using RLY/TRG IN
There are three operating modes for recalling presets using the RLY/TRG IN of the CM16a and a
set of external contacts (switch, relay or other such device). These modes are set up and accessed using
the QSControl software or RS232/Telnet sessions. The purpose of this portion of the manual is to outline the current
implementation of this feature. Be aware that the software and firmware of the CM16a are subject to continuous
improvement and therefore this text can not be guaranteed accurate. Refer to the Qscontrol software help file for the
most up-to-date information.
MODE #1- Recall Preset 15 when contacts connected to RLY/TRG IN contacts are opened. Restore previous settings when contacts
connected to RLY/TRG IN are closed. Preset 14 is used as a “scratchpad” and is OVERWRITTEN. Whatever was in Preset 14 is GONE forever.
Once in this mode, the first time there is a transition from contacts closed to contacts opened, the currently running
settings will be saved , and the settings in preset 15 will be recalled. When the contacts attached to the RLY/TRG
IN are again closed, the settings will revert to their previous values/positions. This could be used for a paging
application where the program inputs are temporarily muted and the page input routed to the outputs; after the
page, the sytem reverts back to it’s previous opearting setup.
MODE #2- Recal Preset 15 when the contacts connected to the RLY/TRG IN are closed. Restore previous settings when contacts connected
to RLY/TRG IN are opened. Preset 14 is used as a “scratchpad” and is OVERWRITTEN. Whatever was in Preset 14 is GONE forever.
This mode is identical to MODE #1 (above) with the exception that the closed and open contact operation is
swapped. Once in this mode, the first time there is a transition from contacts opened to contacts closed, the currently
running settings will be saved , and the settings in Preset 15 will be recalled. When the contacts attached to the
RLY/TRG IN are again opened, the settings will revert to their previous values/positions.
MODE #3- Recall Preset 14 when the contacts connected to the RLY/TRG IN are closed. Restore Preset 15 when the contacts connected
to RLY/TRG IN are opened. In this mode, Preset 14 WILL NOT be overwritten.
Once in this mode, the first time there is a transition from contacts open to contacts closed, Preset 14 will be recalled
OR the first time there is a transition from contacts closed to contacts open, Preset 15 will be recalled. After the
first transition, the CM16a will toggle between Preset 14 and Preset 15 with the corresponding contact closed/open
Note that the presets will only be recalled starting with the first transition of the contacts (opened OR closed). For example, if we are
currently running Preset 2 with the contacts connected to RLY/TRG IN closed, and then change to MODE #3, nothing will happen except
continuing operation in Preset 2. Now, if the contacts are opened, Preset 15 will be recalled. Finally, if the contacts are closed now, Preset
14 will now be recalled. At this point, you can not recall Preset 2 without using the control software. Only Preset 14 & 15 will be available
using the contact I/0.
Section 3: Operation- Bypass Modes and Switch Location
NOTE! Before depressing the BYPASS switch, the gain settings on all amplifiers connected to the
CM16a must be reduced to a safe level. This is because the CM16a’s “Level Control” will be reset
to 0 dB with the BYPASS. Amplifiers could be at maximum output level if the amplifier gain controls
are not turned down.
BYPASS MODE #1 (“virtual-wire”mode): Use this mode if you need the CM16a to behave as a virtual wire. This BYPASS
mode routes all audio straight through with 1Vrms input sensitivity, PAGE input disabled, MUTE disabled, 0 dB level, and normal
polarity. All amplifier control states are set to “on”. Audio passes through the CM16a regardless of network/computer issues.
HOW TO put the CM16a into BYPASS MODE #1:
1- Turn the CM16a on and wait 5 to 10 seconds for the start-up LED sequence to finish.
2- Depress the BYPASS switch (use a paperclip or similar item) and keep it depressed for at least 5 seconds.
3- The two steps above must be completed within 60 seconds from power-up. If you miss the timing, just power-down and
power-up again and repeat steps 1 & 2.
BYPASS MODE #2 (SAFE MODE): Use if the CM16a becomes inoperable (or behaves in completely unexpected ways)
after uploading a new application file (TFTP file transfer).
If the CM16a operates in an unexpected way or is not responding to any communications after a new application file is uploaded
to it, it is likely the file was corrupted during transfer. If this occurs, there is a “backup” program in the CM16a that will enable you
to communicate with it.
HOW TO put the CM16a into BYPASS MODE #2:
1- Turn off the power to the CM16a using the front panel power switch.
2- Depress the BYPASS switch (use a paperclip or similar item) and keep it depressed while turning the power on again.
3- The CM16a is now in “safe mode”. You may release the BYPASS switch.
You will now be able to re-establish Ethernet communications with the CM16a. 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. In safe mode, all connected amplifiers are forced to the standby state, and all audio paths are muted. Also,
no QSControl communication is possible, only TFTP or Telnet, or RS-232.
Location of BYPASS switch: The front panel has a small
access hole on the right side about 12mm (1/2”) to the right from
the PORT H LED. It is NOT LABELED to help prevent accidental
use. This is the BYPASS mode switch. To return to normal
operation, simply reestablish computer communications via the
network or RS-232 and change the appropriate settings (or recall
a previously saved Preset). After completeion of a successful
TFTP file transfer/code re-program cyclefrom the safe mode, the
CM16a will automatically restart in the normal mode of opera-
Section 3: Operation- 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.
This interface is not used by the majority of users. But 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 Set-
RS-232 Communications Procedure:
tings” 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
1) Connect the RS-232 port of the CM16a to an unused serial
access particular menu items so the data can be interpreted.
port (COM port) of a PC using a null modem type cable. These
Connection is made using a null-modem type serial cable be-
cables are different than the ordinary serial cable.
tween your computer’s serial port and the RS-232 port of the
CM16a. 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 CM16a.
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. As many different systems and configurations exist on user’s PC’s, the exact
appearance of the screen shots may vary from those shown.
Furthermore, if programs other than Hyper Terminal are used,
you will need to follow your software’s instructions for establish-
2) Open the HyperTerminal program. This program is usually
started by clicking the Windows START icon, highlighting PROGRAMS, then ACCESSORIES and finally, highlighting the Hyper
Terminal folder and clicking on its icon.
The screen-shot below shows a typical icon-view of the Hyper
Terminal folder (icons shown for each program in the folder). If
your system was setup for a list-view, then you will instead see
a list of what’s in the folder. Identify the Hyper Terminal program
icon (or name from the list) and click (or double-click as required)
to start the program. In the screen-shot below, the Hyper Termi-
nal icon is the fifth from the left in the row of icons.
ing communications through your PC’s COM (serial) port.
HyperTerminal Icon
Section 3: Operation- Serial Port I/O Interface
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: CM16a) and click OK to continue.
4) Next, Hyper Terminal needs to know how to “talk” to the CM16a. This
selection depends on which port on your PC the null-modem cable is
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 dropdown menu selection.
Select the appropriate port (COM1 is used in this example) and click OK to
continue. The Properties window should appear next.
5) The Properties window for the selected COM port should now be active.
It should be similar in appearance as the example to the right.
For the Port Settings, use the following information so communication between the CM16a and the computer is in the same “language”.
Bits per Second
Data Bits
Stop Bits
Flow Control
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 appear next (see next page).
Section 3: Operation- Serial Port I/O Interface
6) The Hyper Terminal main window will appear next, but blank. Type the letter “h” (for help) and then the “Enter” key. This will prompt
the CM16a to post its menu text. The “h” key is the Help prompt for the CM16a.
7) The next screen will look similar to the Hyper Terminal window above. After typing “h” and “Enter”, a text menu will appear. The menu
should appear very similar to the example above. This is sent by the CM16a and will detail your options and instructions for changing the
address information. Any differences in menu text from the above example might occur after any firmware updates of the CM16a.
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 inadvertantly changed to an unrecognized address and subsequently you were unable to “talk” to the CM16a over the network.
This situation would require the “Display Network Settings” and “Enter Network Setup” items to be accessed for re-assigning a “good”
IP address.
Section 3: Operation- Telnet Access
The RS-232 features can be accessed via the network.
The Microsoft Telnet application is a Windows program. Consult Windows documentation for Telnet information .
This is the basic procedure for opening a Telnet session:
1- To open the Telnet sesion- Click START, select RUN, type Telnet followed by a space, then the IP address of the CM16a you want to
communicate with in the text box and click OK. Win2000 will not use a console window (with menu) but rather a DOS window.
2- If the address entered was correct and network communications with the CM16a are successful, the Telnet session should open.
3- Now you have the same options that are available in the Serial Port I/O (RS-232) interface section (see page 29).
Section 3: Operation- Fuse Replacement
If the CM16a does not power-up when the POWER switch is in the “on” position (POWER indicator LED does not illuminate) check the
source of AC power and the connection of the power cord at the outlet and IEC receptacle ends. If the AC source is “on” and the power cord
is connected and in good condition, then the condition of the fuses should be checked.
The fuse holder is an integral part of the IEC connector. It contains two fuses.
• To replace a fuse, first detach the AC power cord from the CM16a.
• Then use a flat-blade screwdriver to pry the fuseholder out, as shown at left.
The fuses are held in the round openings in the end of the fuseholder as shown at
left, below. Replace one or both fuses with the same type: 20 × 5 mm, 2 amp, 250V.
A visual inspection of the fuse will usually indicate if the fuse has been “blown”
or not. This method is not foolproof, however, as sometimes the fuse element is
severed close to the end-cap making it impossible to see the break. When in doubt,
test the fuse with an ohmmeter or just replace the fuse. Below is an illustration of a typical clear
glass-cartridge fuse. The “GOOD” fuse has an intact element from end to end and the “BAD” (or
blown) fuse has a break in the element.
If the CM16a continues to “blow” fuses, DO NOT INCREASE THE FUSE RATING as severe
damage to the CM16a could result. Contact QSC for service if fuses repeatedly blow.
If fuse replacement does not enable the CM16a to power up, double-check the AC power source
and the cord assembly before returning the unit for possible repair.
Section 4: Specifications- Dimensions
Section 4: Specifications
Input Signal Processing
Frequency response
20 Hz–20 kHz ±0.5 dB
10 Hz–80 kHz ±3 dB
<0.01% THD+N @ +4 dBu out
(page input <0.03%)
Dynamic range
>110 dB unweighted
20 Hz–20 kHz
(page input >100 dB)
In-phase or inverted
Level control range
-95.5 to 0 dB in 0.5 dB steps
Precision attenuator
transients (“zipper”
better than 112 dB below
maximum output
>90 dB attenuation
Program inputs
Paging inputs
Monitor bus input
Connector type
Terminal block connectors (also
called “Euro” or “Phoenix”style”), detachable
Common-mode rejection
Typical, >50 dB, 20 Hz–20 kHz
Worst Case, >40 dB at 20 kHz
Crosstalk (interchannel within
Data Port pair)
>75 dB separation, 20 Hz–20 kHz
Crosstalk (intrachannel, between
Data Port pairs)
>85 dB separation,
20 Hz–20 kHz
measured with all inputs and
outputs terminated
Program outputs
Connector type
Cable type
Qualified length
Monitor output
16 (via HD-15)
8 HD-15 data port connections
Special, see appendix
VGA monitor cable
2 meters
“Phoenix-style” (a.k.a.
“Euro-style”) detachable
terminal blocks
Electronically balanced
All shield terminals connected to
Electronically balanced
Shield terminal connected to
Nominal level
Maximum level
1V/3V rms selectable
+21 dBu
10 kOhm balanced
Nominal level
Maximum level
Output impedance
Output load
+4 dBu
+21 dBu
75 Ohms balanced
600 Ohms minimum
Power amplifier output processing
Power amplifier output monitoring
Output short detect*
Senses load <1 Ohm for Stereo/
Parallel modes; <2 Ohms in Bridged Mono mode
Threshold is adjustable in software
Output open detect*
Senses load >60 Ohms
Threshold is adjustable in software
Output voltage meter
Range automatically matches to
amplifier model used
Output current meter
Range automatically matches to
amplifier model used
Amp gain*
determines amplifier gain control setting, range atomatically matches to amplifier model
*Signal level must be greater than -32 dB, referenced to maximum output of amplifier
Section 4: Specifications
Power amplifier management
Power amplifier interface
QSC Data Port equipped amplifiers
Connector and cable
HD-15 VGA cable, 2 meters length
qualified (for longer runs, contact
QSC’s Technical Services Department)
Protect indicator
Temperature meter
Senses amplifier protect status
Reports amplifier operating
Software adjustable threshold
Over-Temp. Alert
AC power control
AC mode control
Switches amplifier between
normal and standby mode
16 amp channels grouped in pairs
Amplifier status monitor
Clip indicator
Senses channel clipping
Bridge mode status Sense bridge mode setting
AC power indicator
Indicates operate, standby, or
power-down mode
Control room foldback monitoring
Signal monitoring buses
(per CM16)
Number of Channels
Internal signal tap points
Pre-fader input signal
Post-fader input signal
Power amplifier output
Monitor input
Nominal level
Maximum level
Input impedance
Common-mode rejection
Mixed with tap point signal at
unity gain
+4 dBu
+21 dBu
10 kOhm balanced
Electronically balanced, shield
connected to chassis
Typical, >50 dB, 20 Hz - 20 kHz
Worst case, >40 dB, 20 Hz-20kHz
Sum of Monitor input and
signal from internal monitor
tap point
Frequency response
Noise floor
Nominal level
Maximum level
Output impedance
Output load
25 Hz–20 kHz ±0.5 dB
<0.05% THD @ +4 dBu out
-90.5 dB
+4 dBu
+21 dBu
75 Ohms balanced
600 Ohms minimum
Active balanced
Adjusts amplitude of signal from
tap point
Monitor in to monitor out
Control range
0 dB, ±0.5 dB
-95.5 to 0 dB in 0.5 dB steps
Contact closure inputs and outputs
1 discrete input (RLY/TRG IN)
Single-ended input
Resistance for closure detect <1kOhm max
Resistance for open detect >5 kOhm min
Input Voltage Limit
7.000 VDC maximum
“-” input terminal connected to chassis
1 discrete output (RLY OUT)
Electromechanical relay, dry
contacts, floating, C, NC, NO
Steady-state current (max.) 0.5 A
Switched current (max.)
0.25 A
Ground isolation
70 volts maximum
“Phoenix-style” (a.k.a.“Euro-style”)
detachable terminal block connectors
Section 4: Specifications
Network Interface
Physical network
Raw data rate
Frame format
Ethernet type
Cable type
Max cable length
Ethernet, IEEE 802.3 compliant
10 megabits per second
D.I.X. (Ethernet)
RJ-45 female
CAT-3 (or better) twisted pair
100 m to hub
Factory IP Address
Supplied on front-panel sticker
as shipped from factory
Transport network
Internetwork protocol
Transport protocol
Application protocol
Network fail-safe
If network connection to the
CM16a is lost, operation will
continue uninterupted
RS232 Port
Cable Type
Null-Modem (such as “Laplink”)
Port Settings
Bits per Second
Data Bits
Stop Bits
Flow Control
1.72” (1 RU)
19” (standard rack mount)
14.84” (37.7 cm), including
rear supports
AC Power
100–240 VAC
1.1 A RMS (@ 100V)
1 A RMS (@ 120V)
0.5 A RMS (@ 230V)
11 lbs (5 kg)
Rear support recommended for
portable or mobile use
47– 440 Hz
Detachable power cord with IEC
Operating temperature
0 to 40° Celsius
2 Ampere, 250 Volt Rating
5mm diameter, 20 mm length
The Amplifier Network Monitor shall provide input, output, and
status control for DataPort equipped QSC power amplifiers in an
Ethernet-TCP/IP based network audio system. Sixteen independent channels shall be provided, grouped in pairs.
Amplifier Input Control and Monitoring—For each of the
Contact Closure I/O—The Amplifier Network Monitor shall
sixteen power amplifier input signals, the CM16a shall
provide a trigger contact-closure sense input which
provide level, mute and polarity control, pre and post fade
shall also be CMOS & TTL signal compatible, and one
signal level metering and audio monitoring, and select-
dry-contact floating SPDT relay output.
able 1Vrms or 3Vrms input sensitivity.
Input Trigger Stand-alone Mode- The Amplifier Network
Page Input- The Amplifier Network Monitor shall provide a page
Monitor shall be capable of recalling up to two Presets
input, separate from the normal program inputs, whose
by the triggering of the contact-closure sense input
signal may preempt the program signal of any or all of the
alone. The user shall have the option to enable/disable
sixteen program channels. This input shall have select-
this function.
able 1V or 3V sensitivity.
Data Network—All Amplifier Network Monitor functions shall
Amplifier Output Monitoring—For each of the sixteen power
be controlled and monitored via a 10BASE-T Ethernet
amplifier outputs, the Amplifier Network Monitor shall
digital control network using the IP transport protocol
provide clipping detection, short and open circuit de-
and the QSControl monitoring application protocol.
tection, voltage and current metering, and audio moni-
Rear-panel connection shall be provided for 10BASE-
toring of the voltage signal.
T Ethernet. Other than the AC power switch and
Amplifier Management—For each of the eight DataPort con-
manual bypass switch, the Amplifier Network Moni-
nections, the Amplifier Network Monitor shall provide
tor shall have no manual controls. The Amplifier Net-
AC standby/operate mode control, AC power state
work Monitor shall continue to operate uninterupted
indication, temperature metering, load status, and
should the network connection be lost for any reason.
protect status detection.
Amplifier Interface—The Amplifier Network Monitor’s inter-
Audio Monitoring Chain—For each of the sixteen program
face to each power amplifier Data Port shall be via an
channels, the Amplifier Network Monitor shall provide
HD-15 connector. The amplifier interface shall use a
three monitor points as follows: (1) pre-fader control,
standard personal computer Video Graphics Adapter
(2) post-fader control, or (3) power amplifier output. A
(VGA) CRT monitor cable. This interface shall transmit
channel’s monitor output may be selected from one of
two amplifier input audio signals as well as all control
these three signals, or it may be switched off. The
and monitoring signals. Special signal conditioning
signal at the Amplifier Network Monitor’s monitor
and grounding techniques shall be used in this inter-
output connector shall be the sum of the signal at its
face to ensure negligible levels of noise and crosstalk.
monitor input connector and four selected channel
General—All audio inputs and outputs shall be balanced with
monitor signals. A monitor gain control shall be pro-
a nominal input level of +4 dBu and maximum level of
vided for each monitor tap point to adjust the indi-
+21 dBu. Input connectors shall be of the “Phoenix”
vidual levels of the channel monitor signals prior to
detachable terminal strip type.
their being mixed with the monitor input signal.
The Amplifier Network Monitor shall be the QSC CM16a.
Section 6: Appendix- Ethernet Cable Pinouts
This diagram shows the pinout for standard unshielded twisted-pair (UTP) network cable. Both ends of the cable are wired
RJ-45 pinout for standard Ethernet
patch cable (both ends identical)
A crossover cable has the RX and TX wire pairs switched around at one end. There are only two likely situations that would require a
crossover cable: to connect a single system controller computer directly to a single CM16a device; and to cascade hubs that don’t have uplink
RJ-45 pinout for an Ethernet
crossover cable
RS-232 Null Modem Cable Pinout
CM16a end of cable must be male pins;
computer end of cable is usually female.
Section 6: Appendix- DataPort Pin-out & Connector P-N’s
DATA PORT PINOUT: The diagram to the right shows the pin assignments
used for the HD-15 connectors on the CM16a and amplifier.
NOTE! This information is shown for reference only and is subject to change without
notice as the DataPort feature is specific to QSC products and not intended for interface
to other manufacturer’s equipment.
The diagram
(right) shows the
pin assignments
for RS-232.
Signal Description
Ch. 1 Minus (-) Input Signal
AC Standby Control
V-MON Ch. 1 and Subcode 1
I-MON Ch. 1 and Subcode 2
Clip/protect Ch. 1
Hard Ground
Ch. 1 Plus (+) Input Signal
Ch. 2 Plus (+) Input Signal
unused for CM16a, +15V on certain amps
Data Reference Ground
Ch. 2 Minus (-) Input Signal
Amp IDR (model ID)]\
V-MON Ch. 2 and Subcode 1
I-MON Ch. 2 and Subcode 2
Clip/protect Ch.2
Signal Description
Signal GND
not used
TERMINAL BLOCK CONNECTOR PART NUMBER REFERENCE- The following manufacturers and part numbers are provided as a
reference to users. The information here is subject to change without the knowledge of QSC.
2 pin: Phoenix Contact - 17 57 01 9; Riacon - 31249102-6; On-Shore Tech - EDZ950/2
3 pin: Phoenix Contact - 17 57 02 2; Riacon - 31249103-6; On-Shore Tech - EDZ950/3
5 pin: Phoenix Contact - 17 57 04 8; Riacon - 31249105-6; On-Shore Tech - EDZ950/5
Strain Relief 3 pin: Phoenix Contact 17 76 16 8
Strain Relief 5 pin: Phoenix Contact 17 76 14 2
WEBSITE reference-
Phoenix- phoenixcon.com
Riacon- riaelectronic.com
On-Shore- on-shore.com
Section 7: How to Contact QSC Audio Products
QSC Audio Products, Inc.
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 USA
Main Number
(714) 754-6175
Sales Direct Line
(714) 957-7100
Sales & Marketing
(800) 854-4079 toll free in U.S.A. only
Technical Services
(714) 957-7150
(800) 772-2834 toll free in U.S.A. only
Sales & Marketing FAX
(714) 754-6174
Technical Services FAX
(714) 754-6173
1675 MacArthur Boulevard
Costa Mesa, California 92626 USA
PH: (714) 754-6175 FAX: (714) 754-6174
“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF