QSC Audio Home Theater System CM16a User Guide

CM16a  
Amplifier Network Monitor  
HARDWARE MANUAL  
*TD-000086-00*  
TD-000086-00  
Rev. B  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE OF CONTENTS: CM16a Amplifier Network Monitor  
Section 1: INTRODUCTION  
Overview...................................................................................................5  
Physical Characteristics & Layout........................................................6  
List of Functions & Features...................................................................8  
Block Diagram.........................................................................................9  
Detailed Description of Functions.......................................................11  
Network Description.............................................................................14  
Network Examples................................................................................15  
Section 2: INSTALLATION  
Basics:  
Unpacking............................................................17  
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  
Amplifiers.............................................................21  
Connecting:  
Rear Panel Detailed Illustration & Hookup Example........................22  
Section 3: OPERATION  
General:  
LED Behavior........................................................23  
Amp Setup, Network Setup...............................24  
Presets..................................................................25  
BYPASS Switch Usage......................................26  
Serial Port Interface...........................................27  
Telnet Access......................................................30  
Fuse Replacement...............................................31  
Section 4: SPECIFICATIONS.......................................................................................................................................32  
Section 5: ARCHITECTS & ENGINEERS SPECIFICATION..................................................................................36  
Section 6: APPENDIX  
Ethernet Cable & RS-232 Pinouts ........................................................37  
DataPort Pinout and Phoenix-type Connector Part Numbers......38  
Section 7: QSC INFORMATION  
How to Contact QSC Audio Products..................................................39  
3
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
SAFEGUARDS  
Electricalenergycanperformmanyusefulfunctions. Thisunithasbeenengineeredandmanufacturedtoassureyourpersonal  
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.  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
WARNING: To prevent fire or electric shock, do not expose this equip-  
ment to rain or moisture.  
1- Maximum operating ambient temperature is 50°C  
(122°F).  
Federal Communications  
Commission (FCC)  
Information  
2- Never restrict airflow through the device fan or vents.  
Please insure that the air intake and exhaust vents are unob-  
structed.  
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 de-  
signed to provide reasonable protection  
againstharmfulinterferenceinacommer-  
cial installation. This equipment gener-  
ates,uses,andcanradiateradiofrequency  
energy and, if not installed and used in  
accordance with the instructions, may  
cause harmful interference to radio com-  
munications. 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 inter-  
ference at his or her own expense.  
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 equip-  
ment should be maintained.  
4
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Overview  
The DataPort connections are made with ordinary VGA  
computer monitor-type cables (HD-15 male-to-male).  
These cables are the same type that are used on personal  
computer systems to connect the monitor to the computer.  
This allows you to use commonly available cabling for  
interconnecting amplifiers to the CM16a. Each DataPort  
connection supports the control and monitoring functions  
for two audio channels. When using the CM16a with  
amplifiers that have more than two channels (such as the 4  
channelcinemaamplifiers)additionalDataPortconnections  
are required.  
TheQSCCM16aAmplifierNetworkMonitorprovidespower-  
ful amplifier management and zone paging capability in a  
QSControl networked audio system using Ethernet network-  
ing technology to communicate with the host computer/  
system controller.  
The host computer uses the QSControl application software  
tooperatethenetworkedaudiosystem,includingtheCM16a’s  
and their amplifiers. The software operates on the Microsoft  
Windows NT® version 4.0 operating system and can be  
customized using Microsoft® Visual Basic Professional Edi-  
tion.  
The CM16a is a control and monitoring device that relies on  
software to do its job. The functions and capabilities pro-  
vided in the design of the CM16a can only be realized with  
proper software implementation. Keep in mind that this  
manual’s intent is to outline these capabilities and provide  
a reference for properly installing and interconnecting the  
CM16atothenetworkedsystem’shostcomputer,the audio  
inputs and the amplifiers to be controlled and monitored. A  
thorough knowledge of the control software’s features and  
operation will provide the best possible results for the end  
user.  
ThismanualoutlinesthecapabilitiesoftheCM16aaswellas  
its installation and connections. The operation of the CM16a  
is accomplished using QSC’s QSControl software. Note that  
not all hardware features may be supported by the current  
software revision. Please refer to the software’s documenta-  
tion & help file for information regarding software features,  
usage and functions.  
EachCM16aperformscontrolandmonitoringfunctionsforup  
to 16 amplifier channels. This could be up to eight 2-channel  
orfour4-channelamplifiers(orsomecombinationofthese)at  
thetimethisdocumentwasprinted.Theamplifierssupported  
by the CM16a are the PowerLight, PL2, PL2A, DCA, and CX  
seriesofQSCamplifiersthathaveabuilt-inDataPort.Models  
that do not have a built-in DataPort or models that have a DP-  
1 option or “V2” DataPort (such as the EX, MXa, & ISA  
series) are NOT supported by the CM16a.  
From all of us at QSC Audio Products, thank you for your  
purchase.  
Note: PL2A amplfiers have programmable filters and  
crossovers. This makes gain “reporting” to the host unreli-  
able 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.  
5
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Physical Characteristics & Layout  
PHYSICAL CHARACTERISTICS  
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: Specifications-  
Dimensions (page 32). The weight of the CM16a is approximately 5 kilograms (11 pounds).  
FRONT PANEL (numbers correspond to reference locations shown in illustration above)  
1-  
2-  
3-  
4-  
5-  
6-  
7-  
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)  
6
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Physical Layout Diagram  
REAR PANEL (numbers correspond to reference locations shown above)  
1-  
2-  
3-  
4-  
5-  
6-  
7-  
8-  
9-  
10-  
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  
7
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- List of Functions & Features  
FUNCTIONAL LISTING, BLOCK DIAGRAM & DETAILED DESCRIPTIONS  
The CM16a performs remote control and monitoring of amplifiers. Below is a listing of the functions available for the supported QSC  
amplifiers.Thefollowingtwopages(BlockDiagrampart1&2)illustratethemainfunctionsoftheCM16a.Followingthediagramisasection  
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.  
CONTROL FUNCTIONS  
Amplifier: Power (Standby/Operate Control)  
CM16a:  
Input Sensitivity Select  
Signal Level Control  
Signal Polarity Select  
Input Source Select (Normal/Page)  
Signal Mute  
Paging Control (with customizable routing)  
Contact Closure Output (switching of internal relay for control of external device)  
Paralleling within DataPort Pair  
MONITOR FUNCTIONS  
Amplifier: Power Status  
Amplifier Gain  
Amplifier Model  
Load Monitor (impedance)  
Output Voltage  
Bridge Mode  
Protection Status  
Output Current  
Output Power (real)  
Headroom  
Heat Sink Temperature (with Over-Temp.)  
Clipping Detect  
Output Short  
Output Open  
CM16a  
Input Level Meter  
Output Level Meter  
Audio Monitor Module (4 channel mono. mixer)  
External Event Sensing (a logic-level or switch input)  
SPECIAL FEATURES  
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  
8
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Block Diagram (part 1)  
9
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Block Diagram (part 2)  
10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Detailed Description of Functions  
AUDIO FUNCTIONS  
AUDIO MONITOR CHAIN FUNCTIONS  
AudioInputs- Thesearethe 3-pinterminalblock connectors  
used for balanced line level audio-signal input. This type of  
connector is sometimes called“Phoenix”or “Euro” style.  
Pre-Fader Monitor- Monitors the audio path at the point  
before the Level Control block (i.e. the input to the CM16a).  
Post-Fader Monitor- Monitors the audio path at the point  
after the Level Control, Mute, and Polarity blocks (i.e. the  
output from the CM16a).  
Input Sensitivity- Sets the sensitivity of the Audio Inputs to  
either 1 Volt or 3 Volts (r.m.s.). This selection should coincide  
with the level of the audio signal provided for each channel.  
Amplifier Monitor- Monitors the audio at the output of the  
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.  
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 deliv-  
ered 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.  
Level Control- Provides adjustment of the signal level  
deliveredtotheamplifierforeachchannel.Adjustmentisfrom  
-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,  
Monitor Chain In. For each of the inputs, the “tap” point is  
selectable from the pre-, post-, amplifier and off positions.  
Meter-These points are indicators of where in the audio path  
the software can “meter” the audio.  
Mute- Actively mutes the audio signal being passed by a  
channel.Nosignalisdeliveredtotheamplifierwhenachannel  
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  
ignored; this includes the PAGE signal. This feature is useful  
forsendingoneinputsignaltobothamplifierchannelswithout  
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  
available (see amplifier manual for details).  
AMPLIFIER CONTROL FUNCTIONS  
Standby/ Operate- Controls the amplifier’s power status-  
ON- amplifier operational  
STANDBY- amplifier in standby mode  
NOTE! The amplifier must be powered in order to respond to  
any commands issued by the CM16a. This means the amp’s  
power switch must physically be in the ON position.  
Polarity- Determines the polarity of the signal delivered to  
the amplifier for each channel.  
11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Detailed Description of Functions  
AMPLIFIER MONITORING FUNCTIONS  
Protect Status Detect- Reports if the amplifier has  
entered “protect” mode (such as thermal, over-current  
or power-up muting protect status).  
Amplifier Model Detect- Identifies what model of  
QSC amplifier is connected to the CM16a’s DataPort.  
Real Power Detect- Reports the “real” power the  
amplifier is delivering. This “real” power is not the  
sameasreactivepower. Realpoweristheproductof  
currentandvoltagetimesthecosineofthephaseangle  
between them.  
Amplifier Gain Detect- Reports the setting of the  
amplifier’s gain setting (in dB) for each channel.  
Bridge Mode Detect- Detects the position of the  
bridge mode switch on each amplifier.  
Clip Detect- Detects amplifier clipping on each chan-  
Threshold Adjust- This indicates that the behavior of  
the associated block requires the input of a threshold  
valueinsoftwarethatmustbecrossedforthedetection  
to occur. This allows the system operator to tailor the  
behavior of the system to each application.  
nel.  
Headroom Metering- Reports the “available” re-  
maining signal level that the input signal can be driven  
before clipping will occur.  
Heat Sink Temperature Metering- Monitors the  
heatsinktemperatureofeachchannelofeachamplifier  
connected to the CM16a. If the temperature exceeds a  
userspecifiedvalue(insoftware)thentheOver-Temp.  
“object” will alert the system operator.  
PAGING FUNCTIONS  
Input Sensitivity- Sets the sensitivity of the Page  
Input to either 1 Vrms or 3 Vrms. This selection should  
coincide with the level of the audio signal provided for  
the Page Input.  
Load Monitor Detect- Monitors the impedance of  
the load at the amplifier output for each channel.  
DAC- This is a digital-to-analog converter that takes  
digital information from the internal microcontroller  
and outputs the corresponding analog “equivalent” to  
the appropriate channel PAGE insert points . This oc-  
curs only by instructions issued by the system operator  
or a custom control application.  
Output Current Meter- Provides for metering of the  
amplifier’s output current on each channel.  
Output Voltage Meter- Provides for metering of the  
amplifier’s output voltage on each channel.  
Output Open Detect- Detects when the load con-  
nected to the amplifier is above a user specified value  
in software.  
Page Input- This is a 3-pin terminal block connector  
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).  
12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Detailed Description of Functions  
RS-232 PORT FUNCTIONS  
CONTACT CLOSURE I/O FUNCTIONS  
RS-232 Port- The RS-232 (serial) port is used to  
communicate with the CM16a for Ethernet address  
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.  
RLYOUT-Thisisa3-pinterminalblock connectorused  
forremotelycontrollinganelectricaldeviceinanon/off  
manner(suchasacoolingfan,anaudiblealarm,alight,  
etc.).AninternalSPDT(single-pole,doublethrow)relay  
is controlled by software command. Its contacts are  
accessible at the rear panel RLY OUT connector and  
are labeled:  
NC (normally closed)  
NO (normally open)  
C (common)  
For the RS-232 port utilities, see the Operation  
section, Serial Port I/O Interfacewhich out-  
lines the proper connection and communication  
settingsrequiredtocommunicatewiththeCM16a  
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  
rear panel. Also accepts CMOS and TTL logic-level  
inputs. An example is the detection of a limit-switch  
that indicates an open door on an equipment cabinet.  
If the CM16a is connected to an Ethernet network  
where the factory-provided IP address information is  
not acceptable, the IP configuration may be changed  
using the RS-232 port. This involves connecting a com-  
puter with a properly configured serial port to the  
CM16a using a null-modem type cable (such as a  
“Laplink” cable) and running a dumb-terminal program  
(HyperTerminal is the Microsoft® Windows- supplied  
program). DO NOT CHANGE THE FACTORY SETTINGS  
UNLESS YOU ARE CERTAIN OF WHAT YOU ARE DO-  
ING!Ifaddressingisconfiguredincorrectly,theCM16a  
may not respond to network control.  
This input may also be configured to activate (recall)  
certain presets without the need for a computer. Setup  
for this feature is possible using the Serial Port I/O or  
Telnet sessions outlined on pages 27 - 30 (ref. menu  
item #10).  
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.  
13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Network Description  
QSC CM16a Amplifier Network Monitors are designed to operate on standard 10BASE-T Ethernet. Each CM16a operates as a  
respectivenodeonitsnetwork;eachunitcontainsaprogrammableIPaddressinnonvolatilememory. Tominimizenetworkconflicts,  
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.  
OnesidenoteregardingEthernetcabling:AlthoughCategory3datacableiscalledoutastheminimumrequirement, itisincreasingly  
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  
availableandcosteffective.IfthecostofCategory5cableisnotprohibitive,itmaybedesirabletodoyourcablingruns withCategory  
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.  
14  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Sample Network Topologies  
The simplest network configuration is a single  
system controller computer and a CM16a con-  
nected by a single Ethernet crossover cable. A  
standard Ethernet cable would NOT work. The  
crossover-type cable must be used when con-  
necting the CM16a directly to the system con-  
troller computer. This type of cable switches  
(or crosses over) the transmit and receive sig-  
nals from one end to the other enabling con-  
nectionwithoutanyintermediatedevices.See  
page 37 for crossover cable pinouts.  
For CAT-3 or CAT-5 distances longer than 100  
meters(~300feet)arepeatermustbeused. An  
active hub or Ethernet switch may be used as  
well.Activehubscleanupandretransmitthe  
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 de-  
vices present) use a hub or switch  
to create a star topology.  
15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1: Introduction- Sample Network Topologies  
Some networks have multiple system con-  
troller computers. This configuration is es-  
sentially 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  
additionalhubsorswitches.Somehavespe-  
cialuplinkportsforconnectingtootherhubs  
or switches via a standard Ethernet cable. If  
the hubs or switches do not have uplink  
ports, then the hub-to-hub or switch-to-  
switch connection should use a crossover-  
type Ethernet cable.  
16  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2: Installation- Basics and Mounting  
UNPACKING  
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).  
WHAT IS INCLUDED IN THE CARTON  
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)  
LOCATION CONSIDERATIONS  
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(328feet).Thelocationofhubsandrepeatersmustbesuchthatthisdistancelimitisnotexceeded.Ifthisisimpracticalorimpossible,  
then use appropriate network transceivers and fiber optic cabling. For larger Ethernet networks, the use of Ethernet routers may be  
necessary.  
MOUNTING THE CM16a  
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  
rackearextensionkitsaddflexibilitytoyouinstallationoptionsaswellasasupport-pinoptionthatrequiresone-timehardwareinstallation  
at the rear of the rack. For the locating dimensions of the rear support mounting tabs, see the dimensional diagram in the specification  
section.  
17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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-drawnairforcooling.Theairintakeisontheleftsideofthechassisandtheexhaustventsareonthefrontpanel.Becertainnottoobstruct  
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  
andsupplyadditionalcooling(airflow) tokeeptheambienttemperaturewithinthespecifiedlimits.QSCamplifiers  
use back-to-front air flow and therefore do not exhaust hot air into the rack.  
CONNECTING AC POWER  
The CM16a uses a detachable IEC standard power cord for connecting to a grounded AC  
REAR PANEL- POWER CORD RECEPTACLE  
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.  
DO NOT CONNECT THE CM16a TO POWER SOURCES OUTSIDE THE SPECIFIED  
RANGES OF VOLTAGE OR FREQUENCY! DAMAGE TO THE UNIT COULD RESULT OR  
THE USER COULD BE EXPOSED TO UNSAFE OPERATING CONDITIONS.  
18  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2: Installation- Connections  
CONNECTING AUDIO INPUTS  
REAR PANEL- AUDIO INPUTS  
The audio inputs are located on the rear  
panel. The CM16a uses terminal block  
connectors for the audio inputs. They are  
sometimes called “Phoenix” or  
“Euro”connectors. These connectors al-  
low the installer to pre-wire the input ter-  
minationsbeforetheCM16aisinstalledin  
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 INPUT CONNECTION  
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 when-  
ever possible. If unbalanced audio sources are used, it is preferable to use an  
appropriate audio transformer (or other unbalanced-to-balanced “converter”) to  
provideabalancedinputtotheCM16a. Ifthisisnotpossible, thenitisrecommended  
thenegative terminalandshieldterminalbeconnectedtooneanotherwithajumper  
wire.  
UNBALANCED INPUT CONNECTION  
Terminal Block Connector Hints-  
Strip length : 6 to 8 mm ( 1/4 to 5/16 inch) .  
Be careful not to nick or cut the conductor strands .  
Aftereachconductorhasbeenstripped, insertit fully intotheconnector  
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.  
STRAIN RELIEF  
Forheavy-dutyinputcables,theuseofconnectorswithintegralstrainrelief  
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.  
19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2: Installation- Connections  
CONNECTING PAGE INPUT  
The PAGE input connections are the same as the AUDIO INPUT  
REARPANEL-PAGE,RELAY&MONITORCONNECTIONS  
connections. Please refer to the previous page for connector  
pinout.  
CONNECTING THE RLY/TRG IN  
TheRLY/TRGINconnectorisatwo-pinterminalblockconnec-  
tor. When using this input for a switch-closure (or opening)  
event, the two terminals should be connected to the switch  
contactsdirectly.Thistypeofeventdetectioncanbeusedwith  
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 de-  
vices. 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 avail-  
able through RS-232 or Telnet communications.  
CONNECTING THE RLY OUT  
CONNECTING THE MONITOR CHAIN IN/OUT  
The RLY OUT connector provides access to the internal relay’s  
contacts for remotely controlling an external low voltage device  
or circuit. This internal relay is rated for 70V (DC or ACrms), 250  
mA(switched)andisisolatedfromground. Thereisonecommon  
terminal, one normally-closed contact terminal and one nor-  
mally-open contact terminal. These are labeled as C, NC and NO  
ontherearpanel. Whentherelayisnotenergized, theCterminal  
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.  
The MONITOR CHAIN connector is a 5-pin terminal block con-  
nector. The center pin is the shield connection for both the input  
and output of the monitor chain. Note also that the positive  
terminal of the input and output connections are on the outer  
pins of this connector.  
ATTENTION! DO NOT CONNECT VOLTAGES EXCEEDING 70 VOLTS (DC or AC rms) TO THE RLY OUT CONNECTOR!  
DAMAGE TO THE CM16a COULD RESULT OR CREATE HAZARDOUS OPERATING CONDITIONS! If there is a need to switch  
higher voltage or current levels with the CM16a, contact Technical Services for suggested solutions.  
20  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2: Installation- Connections  
CONNECTION TO 10BASE-T (network connection)  
ConnectiontotheEthernetnetworkismadeusingtheRJ-45type  
connector labeled 10BASE-T on the rear panel.“RJ-45” is the  
standardnetworkconnectorforEthernetnetworks.InserttheRJ-  
45plugintothereceptaclewiththelock-taborientedtowardthe  
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.IftheCM16aisconnecteddirectlytothesystemcontrol-  
ler computer’s network interface card, a crossover type cable is  
required. All other connection methods utilize normal Ethernet  
cabling.  
CONNECTING TO THE RS-232 PORT  
Connection is made with a null-modem serial cable with a DB-9  
maleplugtotheCM16a. TheRS-232 portcanbeusedforsetting  
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.  
CONNECTING TO 4-CHANNEL AMPLIFIERS  
CONNECTING TO 2-CHANNEL AMPLIFIERS  
Two basic rules must be adhered to:  
2-channel amplifiers require a cable connection from the amp’s  
DataPort to the appropriate PORT receptacle on the CM16a.  
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).  
First, both DataPorts of the amplifier must be used.  
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  
connectingthetwoamplifierDataPortstotwoseparateCM16a’s;  
the system will not function properly). Insure that both amplifier  
DataPorts are used and that they are connected to the same  
CM16a. YoudonothavetouseadjacentportsontheCM16a(i.e.  
PORT C and PORTD). 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.  
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’smetalsurroundingiswiderthantheother)andalignitwith  
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  
procedureappliesforconnectingtheotherendofthecabletothe  
amplifier’s DataPort.  
21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2: Installation- Rear Panel Detail  
22  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
POWER LED-  
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  
DIAGNOSTICLEDremainsilluminated,tryresettingtheCM16abycyclingpoweroffand  
on once. Should the indication persist, contact QSC’s Technical Services for guidance.  
DIAGNOSTIC LED-  
There are three LED’s on the front and rear panels labeled RCV, XMT and LINKSTATUS.  
Their functions are described below.  
NETWORK STATUS LEDs-  
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.  
TheseLED’sarelabeledPORTAthroughPORTHonthefrontpanel.TherespectiveLED  
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.  
PORT CONNECTED LEDs-  
23  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3: Operation- General Information & Presets  
AMPLIFIER SETUP-The amplifiers connected to the CM16a  
must have their power switches in the “on” position. For initial  
testing, it is advisable that the amplifiers be set for the lowest  
useful gain (volume) setting until it is verified that the system is  
operating as expected. After the system setup has been verified  
and tested, gain settings may be set as required.  
Thepresetsareusefultools,butPreset0actsdifferentlythanthe  
others.EachtimetheCM16aispoweredup,itrecallsitssettings  
from Preset 0. The factory Preset 0, discussed above, is a muted  
state with amps in STANDBY mode. When setting up your own  
presets, they should be stored in Preset 1 through Preset 15. See  
next page for notes regarding Preset 14’s use as a “scratchpad”.  
NETWORK- The network should be operable and QSControl  
software should be installed/running on the system controller  
computer.  
The reason for not actively using Preset 0 is as follows:  
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  
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.  
WhateverwasinPreset0isnowgoneforever. Thisinsuresthat  
thenexttimetheCM16aispoweredup,it’ssettingsarethesame  
as you left them. Remember, the CM16a always powers up  
in Preset 0. Refer to the software documentation for further  
information.  
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.  
Operation of the CM16a is accomplished with QSControl soft-  
ware.  
START-UP BEHAVIOR AND PRESET OPERATING  
MODES- It is important to understand the start-up behavior  
outlined below. Some of the terminolgy is specific to QSControl  
software; refer to the software’s helpfile for detailed informa-  
tion.  
Preset 0 will only be overwritten 4 minutes after the last  
control change. This includes if the CM16a is placed into  
one of its BYPASS modes as discussed in the following  
section. If the CM16a is placed into BYPASS mode and operated  
for at least 4 minutes without control changes, then the BYPASS  
mode is saved in Preset 0. The next time the CM16a is powered  
up,itwillstartupinPreset0(orBYPASSinthiscase).Thiscould  
cause dangerously high output levels from the system.  
Insure amplifier gain controls are reduced to safe levels  
ANY time BYPASS mode is used.  
When first taken out the box, the CM16a will power up in  
amutedstate withallfadersat-95.5dB.,polaritysettonormal,  
sensitivity set to 3V, and any amplifiers connected to the CM16a  
will be in STANDBY mode. This “setup” is the factory setting.  
PRESETS- The CM16a has 16 Presets for quickly recalling  
settings. They are numbered 0 (zero) through 15. These presets  
areusefulforquicklychangingfromonesetuptoanotherwithout  
having to change each individual control to a new setting. An  
example might be in a house of worship where the audio system  
setup is different for each service. Instead of having to keep a  
trained system operator on location, another individual with  
minimal training can be shown how to change to the desired  
preset for each situation.  
The CM16a has all outputs momentarily muted at power-up to  
preventunexpectedaudiopops,clicksorthumps.Remember: At  
power up, the CM16a will always start operating with the  
settings saved in Preset 0. Once network communication has  
been established between the host computer and the CM16a,  
the CM16a may be controlled remotely . In the event that the  
network communications link is lost while the CM16a is  
operating, itwillcontinuetooperatewithitslastsettings  
intact.  
24  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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  
improvementandthereforethistextcannotbeguaranteedaccurate. RefertotheQscontrolsoftwarehelpfileforthe  
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  
connectedtoRLY/TRGINareclosed.Preset14isusedasascratchpadandisOVERWRITTEN.WhateverwasinPreset14isGONEforever.  
Onceinthismode, thefirsttimethereisatransitionfromcontactsclosedtocontactsopened, thecurrentlyrunning  
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-RecalPreset15whenthecontactsconnectedtotheRLY/TRGINareclosed.Restoreprevioussettingswhencontactsconnected  
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.Onceinthismode,thefirsttimethereisatransitionfromcontactsopenedtocontactsclosed,thecurrently  
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.  
Onceinthismode,thefirsttimethereisatransitionfromcontactsopentocontactsclosed,Preset14willberecalled  
OR the first time there is a transition from contacts closed to contacts open, Preset 15 will be recalled. After the  
firsttransition,theCM16awilltogglebetweenPreset14andPreset15withthecorrespondingcontactclosed/open  
position.  
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.  
25  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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 CM16as Level Controlwill be reset  
to 0 dB with the BYPASS. Amplifiers could be at maximum output level if the amplifier gain controls  
are not turned down.  
BYPASSMODE#1(virtual-wiremode):UsethismodeifyouneedtheCM16atobehaveasavirtualwire. ThisBYPASS  
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.  
BYPASSMODE#2(SAFEMODE):UseiftheCM16abecomesinoperable(orbehavesincompletelyunexpectedways)  
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 re-  
established, 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  
networkorRS-232andchangetheappropriatesettings(orrecall  
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-  
tion.  
26  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
Thisinterfaceisnotusedbythemajorityofusers. Butshouldany  
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  
access particular menu items so the data can be interpreted.  
1) Connect the RS-232 port of the CM16a to an unused serial  
port (COM port) of a PC using a null modem type cable. These  
cables are different than the ordinary serial cable.  
Connection is made using a null-modem type serial cable be-  
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 Win-  
dows-based PC’s) is started and communication established  
between the PC and the CM16a.  
2) Open the HyperTerminal program. This program is usually  
started by clicking the Windows START icon, highlighting PRO-  
GRAMS, then ACCESSORIES and finally, highlighting the Hyper  
Terminal folder and clicking on its icon.  
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 differ-  
ent 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,  
youwillneedtofollowyoursoftware’sinstructionsforestablish-  
ing communications through your PC’s COM (serial) port.  
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  
alistofwhat’sinthefolder. IdentifytheHyperTerminalprogram  
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.  
HyperTerminal Icon  
27  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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  
connected.  
Ignorethefirstthreeentryfields(phonenumberinformation)and godirectly  
to the “Connect using:” entry field and click on the down arrow for the drop-  
down menu selection.  
Select the appropriate port (COM1 is used in this example) and click OK to  
continue. The Properties window should appear next.  
5)ThePropertieswindowfortheselectedCOMportshouldnowbeactive.  
It should be similar in appearance as the example to the right.  
For the Port Settings, use the following information so communica-  
tion between the CM16a and the computer is in the same “language”.  
Bits per Second  
Data Bits  
9600  
8
Parity  
none  
1
Stop Bits  
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 appear next (see next page).  
28  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
Fromthismain-menuyouwillneedtomakeyourmenuchoicesandfollowtheinstructionsinthefollowingsub-menusorscreens.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  
addresswasinadvertantlychangedtoanunrecognizedaddressandsubsequentlyyouwereunabletotalktotheCM16aoverthenetwork.  
This situation would require the “Display Network Settings” and “Enter Network Setup” items to be accessed for re-assigning a “good”  
IP address.  
IP ADDRESS ASSIGNMENT-  
ONLY REQUIRED FOR ATTACHING TO EXISTING NETWORKS!  
DO NOT CHANGE THE COMMUNICATIONS SETTINGS OF THE CM16a UNLESS CERTAIN OF YOUR ACTIONS. THE  
FACTORY-PROGRAMMED IP ADDRESS IS PRINTED ON A LABEL AFFIXED TO THE FRONT PANEL OF THE CM16A  
WHEN IT IS SHIPPED. RECORD THIS IP ADDRESS SHOULD YOU NEED TO RETURN TO THE INITIAL SETTINGS.  
29  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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).  
30  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3: Operation- Fuse Replacement  
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. Replaceoneorbothfuseswiththesametype:20×5mm, 2amp, 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  
severedclosetotheend-capmakingitimpossibletoseethebreak.Whenindoubt,  
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.  
IffusereplacementdoesnotenabletheCM16atopowerup, double-checktheACpowersource  
and the cord assembly before returning the unit for possible repair.  
31  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 4: Specifications- Dimensions  
SIDE  
FRONT  
TOP  
32  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 4: Specifications  
Input Signal Processing  
Common-mode rejection  
Typical, >50 dB, 20 Hz–20 kHz  
Worst Case, >40 dB at 20 kHz  
Frequency response  
Distortion  
20 Hz–20 kHz 0.5 dB  
10 Hz–80 kHz 3 dB  
<0.01% THD+N @ +4 dBu out  
(page input <0.03%)  
Crosstalk (inter-  
channel within  
Data Port pair)  
>75 dB separation, 20 Hz–20 kHz  
Dynamic range  
>110 dB unweighted  
20 Hz–20 kHz  
Crosstalk (intra-  
channel, between  
Data Port pairs)  
>85 dB separation,  
20 Hz–20 kHz  
measured with all inputs and  
outputs terminated  
(page input >100 dB)  
Polarity  
In-phase or inverted  
Level control range  
-95.5 to 0 dB in 0.5 dB steps  
Precision attenuator  
transients (zipper”  
noise)  
better than 112 dB below  
maximum output  
Outputs  
Program outputs  
Connector type  
Pinout  
16 (via HD-15)  
8 HD-15 data port connections  
Special, see appendix  
VGA monitor cable  
2 meters  
Mute  
>90 dB attenuation  
Cable type  
Qualified length  
Inputs  
Program inputs  
Paging inputs  
Monitor bus input  
Connector type  
16  
1
1
Monitor output  
Connector  
1
“Phoenix-style” (a.k.a.  
“Euro-style”) detachable  
terminal blocks  
Terminal block connectors (also  
called “Euro” or “Phoenix”-  
style”), detachable  
Type  
Grounding  
Electronically balanced  
All shield terminals connected to  
chassis  
Type  
Grounding  
Electronically balanced  
Shield terminal connected to  
chassis  
Nominal level  
Maximum level  
Impedance  
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  
Senses load >60 Ohms  
Threshold is adjustable in software  
Range automatically matches to  
amplifier model used  
Range automatically matches to  
amplifier model used  
determines amplifier gain control setting, range atomatically matches to amplifier model  
Output open detect*  
Output voltage meter  
Output current meter  
Amp gain*  
*Signal level must be greater than -32 dB, referenced to maximum output of amplifier  
33  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 4: Specifications  
Power amplifier management  
Power amplifier interface  
Protect indicator  
Temperature meter  
Senses amplifier protect status  
Reports amplifier operating  
temperature  
Compatibility  
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)  
Over-Temp. Alert  
Software adjustable threshold  
AC power control  
AC mode control  
Switches amplifier between  
normal and standby mode  
Amplifiers  
16 amp channels grouped in pairs  
Amplifier status monitor  
AC power indicator  
Indicates operate, standby, or  
power-down mode  
Clip indicator  
Senses channel clipping  
Bridge mode status Sense bridge mode setting  
Control room foldback monitoring  
Output  
Sum of Monitor input and  
signal from internal monitor  
tap point  
Signal monitoring buses  
(per CM16)  
1
Number of Channels  
4
Internal signal tap points  
Pre-fader input signal  
Frequency response  
Distortion  
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  
16  
16  
16  
Post-fader input signal  
Power amplifier output  
Monitor input  
Mixed with tap point signal at  
unity gain  
Nominal level  
Maximum level  
Input impedance  
Configuration  
+4 dBu  
+21 dBu  
10 kOhm balanced  
Electronically balanced, shield  
connected to chassis  
Configuration  
Level  
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  
Common-mode rejection  
Typical, >50 dB, 20 Hz - 20 kHz  
Worst case, >40 dB, 20 Hz-20kHz  
Contact closure inputs and outputs  
Inputs  
Configuration  
1 discrete input (RLY/TRG IN)  
Single-ended input  
Output  
1 discrete output (RLY OUT)  
Electromechanical relay, dry  
contacts, floating, C, NC, NO  
Configuration  
Resistance for closure detect <1kOhm max  
Resistance for open detect >5 kOhm min  
Steady-state current (max.) 0.5 A  
Input Voltage Limit  
7.000 VDC maximum  
Switched current (max.)  
Ground isolation  
0.25 A  
70 volts maximum  
“-” input terminal connected to chassis  
Connector  
“Phoenix-style” (a.k.a.“Euro-style”)  
detachable terminal block connectors  
34  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 4: Specifications  
Network Interface 10BASE-T  
Physical network  
Raw data rate  
Frame format  
Connector  
Ethernet, IEEE 802.3 compliant  
10 megabits per second  
D.I.X. (Ethernet)  
RJ-45 female  
10BASE-T  
Transport network  
Internetwork protocol  
Transport protocol  
TCP/IP  
IP  
UDP  
Application protocol  
Version  
QSC24  
1
7
Ethernet type  
Cable type  
Max cable length 100 m to hub  
Grounding Floating  
CAT-3 (or better) twisted pair  
Revision  
Network fail-safe  
If network connection to the  
CM16a is lost, operation will  
continue uninterupted  
Factory IP Address Supplied on front-panel sticker  
as shipped from factory  
RS232 Port  
Cable Type  
Null-Modem (such as “Laplink”)  
Port Settings  
Bits per Second  
Data Bits  
9600  
8
Parity  
Stop Bits  
none  
1
Flow Control  
Xon/Xoff  
General  
Physical  
Height  
Width  
AC Power  
Voltage  
1.72” (1 RU)  
100–240 VAC  
19” (standard rack mount)  
14.84” (37.7 cm), including  
rear supports  
Current  
1.1 A RMS (@ 100V)  
1 A RMS (@ 120V)  
0.5 A RMS (@ 230V)  
Depth  
Weight  
Mounting  
11 lbs (5 kg)  
Rear support recommended for  
portable or mobile use  
Frequency  
Disconnect  
47– 440 Hz  
Detachable power cord with IEC  
connector  
Operating temperature  
0 to 40° Celsius  
Fuses  
2 Ampere, 250 Volt Rating  
5mm diameter, 20 mm length  
35  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SECTION 5 : ARCHITECTS AND ENGINEERS SPECIFICATIONS  
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 indepen-  
dent 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  
providelevel,muteandpolaritycontrol,preandpostfade  
signal level metering and audio monitoring, and select-  
able 1Vrms or 3Vrms input sensitivity.  
provide a trigger contact-closure sense input which  
shall also be CMOS & TTL signal compatible, and one  
dry-contact floating SPDT relay output.  
Input Trigger Stand-alone Mode- The Amplifier Network  
MonitorshallbecapableofrecallinguptotwoPresets  
by the triggering of the contact-closure sense input  
alone.Theusershallhavetheoptiontoenable/disable  
this function.  
Page Input- The Amplifier Network Monitor shall provide a page  
input, separate from the normal program inputs, whose  
signalmaypreempttheprogramsignalofanyorallofthe  
sixteen program channels. This input shall have select-  
able 1V or 3V sensitivity.  
DataNetwork—AllAmplifierNetworkMonitorfunctionsshall  
be controlled and monitored via a 10BASE-T Ethernet  
digital control network using the IP transport protocol  
and the QSControl monitoring application protocol.  
Rear-panel connection shall be provided for 10BASE-  
T Ethernet. Other than the AC power switch and  
manual bypass switch, the Amplifier Network Moni-  
tor shall have no manual controls. The Amplifier Net-  
work Monitor shall continue to operate uninterupted  
should the network connection be lost for any reason.  
AmplifierOutputMonitoring—Foreachofthesixteenpower  
amplifieroutputs,theAmplifierNetworkMonitor shall  
provide clipping detection, short and open circuit de-  
tection,voltageandcurrentmetering,andaudiomoni-  
toring of the voltage signal.  
Amplifier Management—For each of the eight DataPort con-  
nections, theAmplifierNetworkMonitorshallprovide  
AC standby/operate mode control, AC power state  
indication, temperature metering, load status, and  
protect status detection.  
Amplifier Interface—The Amplifier Network Monitor’s inter-  
face to each power amplifier Data Port shall be via an  
HD-15 connector. The amplifier interface shall use a  
standard personal computer Video Graphics Adapter  
(VGA) CRT monitor cable. This interface shall transmit  
two amplifier input audio signals as well as all control  
and monitoring signals. Special signal conditioning  
and grounding techniques shall be used in this inter-  
face to ensure negligible levels of noise and crosstalk.  
Audio Monitoring Chain—For each of the sixteen program  
channels,theAmplifierNetworkMonitorshallprovide  
three monitor points as follows: (1) pre-fader control,  
(2) post-fader control, or (3) power amplifier output. A  
channel’s monitor output may be selected from one of  
these three signals, or it may be switched off. The  
signal at the Amplifier Network Monitor’s monitor  
output connector shall be the sum of the signal at its  
monitor input connector and four selected channel  
monitor signals. A monitor gain control shall be pro-  
vided for each monitor tap point to adjust the indi-  
vidual levels of the channel monitor signals prior to  
their being mixed with the monitor input signal.  
General—All audio inputs and outputs shall be balanced with  
a nominal input level of +4 dBu and maximum level of  
+21 dBu. Input connectors shall be of the “Phoenix”  
detachable terminal strip type.  
The Amplifier Network Monitor shall be the QSC CM16a.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6: Appendix- Ethernet Cable Pinouts  
ETHERNET CABLING  
This diagram shows the pinout for standard unshielded twisted-pair (UTP) network cable. Both ends of the cable are wired  
identically.  
RJ-45pinoutforstandardEthernet  
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  
crossovercable:toconnectasinglesystemcontrollercomputerdirectlytoasingleCM16adevice;andtocascadehubsthatdon’thaveuplink  
ports.  
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.  
37  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6: Appendix- DataPort Pin-out & Connector P-Ns  
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  
noticeastheDataPortfeatureisspecifictoQSCproductsandnotintendedforinterface  
to other manufacturer’s equipment.  
Pin  
1
Signal Description  
Ch. 1 Minus (-) Input Signal  
AC Standby Control  
2
3
V-MON Ch. 1 and Subcode 1  
I-MON Ch. 1 and Subcode 2  
Clip/protect Ch. 1  
4
5
6
Hard Ground  
7
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)]\  
8
9
10  
11  
12  
13  
14  
15  
V-MON Ch. 2 and Subcode 1  
I-MON Ch. 2 and Subcode 2  
Clip/protect Ch.2  
RS-232 PINOUT:  
The diagram  
(right) shows the  
pin assignments  
for RS-232.  
Pin  
Signal Description  
1
2
3
4
5
6
7
8
9
DCD  
RX  
TX  
DTR  
Signal GND  
DSR  
RTS  
CTS  
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  
38  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 7: How to Contact QSC Audio Products  
ADDRESS:  
QSC Audio Products, Inc.  
1675 MacArthur Boulevard  
Costa Mesa, CA 92626-1468 USA  
TELEPHONE NUMBERS:  
Main Number  
(714) 754-6175  
Sales Direct Line  
Sales & Marketing  
Technical Services  
(714) 957-7100  
(800) 854-4079 toll free in U.S.A. only  
(714) 957-7150  
(800) 772-2834 toll free in U.S.A. only  
FACSIMILE (FAX) NUMBERS:  
Sales & Marketing FAX  
Technical Services FAX  
(714) 754-6174  
(714) 754-6173  
WORLD WIDE WEB:  
39  
Download from Www.Somanuals.com. All Manuals Search And Download.  
1675 MacArthur Boulevard Costa Mesa, California 92626 USA PH: (714) 754-6175 FAX: (714) 754-6174  
QSCand the QSC logo are registered with the U.S. Patent and Trademark Office  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Raritan Computer Switch DKSXII V230 0D E User Guide
Rayming GPS Receiver TN 206 User Guide
RCA Dishwasher PSD3420ZBB User Guide
Remington Electric Shaver CORDLESS RECHARGEABLE SHAVER User Guide
Renesas Stereo System M32R FPU User Guide
Royal Sovereign Laminator CS 900 User Guide
Samsung Cell Phone SPH M350TIASPR User Guide
Samsung Home Theater System AH68 02255S User Guide
Samsung Printer SPPR200BG User Guide
Savin Printer 1802d User Guide