QSC Audio CM16a User Manual

Download

CM16a

Amplifier Network Monitor

HARDWARE MANUAL

*TD-000086-00*

TD-000086-00 Rev. B

¨ WARNING ¨

While QSC has endeavored to develop and produce the most depend-

able 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 implementa-

tion of QSControl products be completely separate from all

other networks, data or otherwise. As such, should you elect to

integrate QSControl products with your existing network system, all

risks attendant to such integration of QSControl products with your

existing network or network systems are assumed by you. While QSC

strives to provide the highest quality technical solutions for networked

audio products, in no event will QSC or its suppliers be held liable for

any damages, consequential, incidental or otherwise, including any

claims for lost profits and/or savings resulting from any attempted

integration of QSControl products with your networking systems. No

agent, employee or representative of QSC has any authority to alter or

modify in any manner, the disclosures and recommendations set forth

herein.

QSC® 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

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

Connecting: AC Power..............................................................18

Audio Inputs.........................................................19

Page Input............................................................20

RLY/TRG Input......................................................20

RLY Output............................................................20

Monitor Chain In/Out..........................................20

BASE-T Input/Output........................................21

RS-232 Port...........................................................21

Amplifiers.............................................................21

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: ARCHITECT’S & ENGINEER’S 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

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

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

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel.

WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture.

1- Maximum operating ambient temperature is 50°C

(122°F).

2- Never restrict airflow through the device fan or vents.

Please insure that the air intake and exhaust vents are unob-

structed.

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.

Federal Communications Commission (FCC)

Information

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.

5- Reliable Earthing (Grounding) of rack-mounted equip-

ment should be maintained.

Section 1: Introduction- Overview

The QSC CM16a Amplifier Network Monitor provides power-

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

to operate the networked audio system, including the CM16a’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.

This manual outlines the capabilities of the CM16a as well as

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.

Each CM16a performs control and monitoring functions for up

to 16 amplifier channels. This could be up to eight 2-channel

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.

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

channel cinema amplifiers) additional DataPort connections

are required.

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

CM16a to the networked system’s host computer, 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.

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.

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

FRONT PANEL (numbers correspond to reference locations shown in illustration above)

). The weight of the CM16a is approximately 5 kilograms (11 pounds).

1- POWER switch

2- Cooling air exhaust vents (intake vents are located on left side of chassis as viewed from the front)

3- POWER on indicator

4- DIAGNOSTIC indicator

5- RCV, XMT and LINK STATUS network status indicators

6- PORT A - PORT H connection indicators

7- 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)

1- DataPort connectors PORT A - PORT H

2- PORT A CH 1 - PORT H CH 16 three-pin receptacles for audio inputs

3- PAGE three-pin receptacle for paging audio signal input

4- MONITOR CHAIN, IN and OUT five-pin receptacle for audio monitoring functions

5- RLY / TRG IN two-pin receptacle for remote sensing of switch closure or logic event

6- RLY OUT three-pin receptacle for output terminals of CM16a’s internal SPDT relay contacts

7- RCV, XMT and LINK STATUS network status indicators

8- 10BASE-T RJ-45 Ethernet computer network connection

9- RS-232 port for network and firmware utilities

10- IEC-type detachable AC power cord receptacle (for connection to AC line cord) with integral fuse holder

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. 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.

CONTROL FUNCTIONS

Amplifier: Power (Standby/Operate Control)

CM16a: 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

MONITOR FUNCTIONS

Amplifier: Power Status Amplifier Gain

CM16a Input Level Meter Output Level Meter

SPECIAL FEATURES

Amplifier Model Bridge Mode

Load Monitor (impedance) Protection Status

Output Voltage Output Current

Output Power (real) Heat Sink Temperature (with Over-Temp.)

Headroom Clipping Detect

Output Short Output Open

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 FUNCTIONS

Audio Inputs- These are the 3-pin terminal block connectors

used for balanced line level audio-signal input. This type of

connector is sometimes called“Phoenix”or “Euro” style.

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.

Input Source: Normal/Page- Selects the input source for

each channel.

Audio Input

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.

Mute- Actively mutes the audio signal being passed by a

channel. No signal is delivered to the amplifier when a channel

is muted.

Normal

terminals.

input is the audio connected at the

Page

input is the audio provided by the

AUDIO MONITOR CHAIN FUNCTIONS

Pre-Fader Monitor- Monitors the audio path at the point

before the

Post-Fader Monitor- Monitors the audio path at the point

after the

output from the CM16a).

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 deliv-

ered to the

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,

Monitor Chain In

selectable from the pre-, post-, amplifier and off positions.

Level Control

Level Control, Mute

Monitor Module

block (i.e. the input to the CM16a).

, and

Polarity

blocks (i.e. the

from each of the selectable “tap”

. For each of the inputs, the “tap” point is

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

for sending one input signal to both amplifier channels without

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).

Polarity- Determines the polarity of the signal delivered to

the amplifier for each channel.

AMPLIFIER CONTROL FUNCTIONS

Standby/ Operate- Controls the amplifier’s power status-

- amplifier operational

STANDBY

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.

- amplifier in standby mode

Section 1: Introduction- Detailed Description of Functions

AMPLIFIER MONITORING FUNCTIONS

Amplifier Model Detect- Identifies what model of

QSC amplifier is connected to the CM16a’s DataPort.

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-

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

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.

“object” will alert the system operator.

Load Monitor Detect- Monitors the impedance of

the load at the amplifier output for each channel.

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.

Protect Status Detect- Reports if the amplifier has

entered “protect” mode (such as thermal, over-current

or power-up muting protect status).

Real Power Detect- Reports the “real” power the

amplifier is delivering. This “real” power is not the

same as “reactive” power. Real power is the product of

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

value in software that must be crossed for the detection

to occur. This allows the system operator to tailor the

behavior of the system to each application.

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.

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.

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).

Section 1: Introduction- Detailed Description of Functions

RS-232 PORT 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.

For the RS-232 port utilities, see the Operation

section, “Serial Port I/O Interface” which out-

lines the proper connection and communication

settings required to communicate with the CM16a

via the serial (RS232) port.

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! If addressing is configured incorrectly, the CM16a

may not respond to network control.

CONTACT CLOSURE I/O FUNCTIONS

RLY OUT- This is a 3-pin terminal block connector used

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:

NC (normally closed)

NO (normally open)

C (common)

RLY/TRG IN- Detects the closure (or opening) of a

switch connected to 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.

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).

RLY/TRIG IN

terminals on the

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 con-

nected by a single Ethernet

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-

nection 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.

crossover

cable. A

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.

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

additional hubs or switches. Some have spe-

cial 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-to-

switch connection should use a crossover-

type Ethernet cable.

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 (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

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

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.

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.

CONNECTING AC POWER

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.

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.

REAR PANEL- POWER CORD RECEPTACLE

Section 2: Installation- Connections

CONNECTING 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-

minations 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.

REAR PANEL- AUDIO INPUTS

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.

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

wire.

If unbalanced audio sources are used

, it is preferable to use an

BALANCED INPUT CONNECTION

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 .

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.

STRAIN RELIEF

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

CONNECTING PAGE INPUT

The

PAGE

input connections are the same as the AUDIO INPUT

connections. Please refer to the previous page for connector

pinout.

CONNECTING THE RLY/TRG IN

The

RLY/TRG IN

tor. 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 de-

vices. For the defined limits of input to this connector , please

refer to the specification section.

connector is a two-pin terminal block connec-

REAR PANEL- PAGE, RELAY & MONITOR CONNECTIONS

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

The

RLY OUT

contacts for remotely controlling an external low voltage device

or circuit. This internal relay is rated for 70V (DC or ACrms), 250

mA (switched) and is isolated from ground. There is one common

terminal, one normally-closed contact terminal and one nor-

mally-open contact terminal. These are labeled as

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.

connector provides access to the internal relay’s

C, NC

and

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!

higher voltage or current levels with the CM16a, contact Technical Services for suggested solutions.

CONNECTING THE MONITOR CHAIN IN/OUT

The

MONITOR CHAIN

nector. The center pin is the shield connection for

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.

connector is a 5-pin terminal block con-

both

the input

If there is a need to switch

Section 2: Installation- Connections

CONNECTION TO 10BASE-T (network connection)

Connection to the Ethernet network is made using the RJ-45 type

connector labeled

standard network connector for Ethernet networks. Insert the RJ-

45 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

ler computer’s network interface card, a

required. All other connection methods utilize normal Ethernet

cabling.

10BASE-T

CONNECTING TO THE RS-232 PORT

Connection is made with a null-modem serial cable with a DB-9

male plug to the CM16a. The

various operational parameters that are CRITICAL to proper

operation of the CM16a. The network address settings can be

changed through this port.

Address unless you are certain of what you are doing!

Refer to Section 3

on the rear panel.“RJ-45” is the

directly

to the system control-

crossover

RS-232

port can be used for setting

Do Not Change the Network

(page 27) for more information.

type cable is

CONNECTING TO 2-CHANNEL AMPLIFIERS

2-channel amplifiers require a cable connection from the amp’s

DataPort to the appropriate

These HD-15 type connectors are labeled

. 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.

PORT

receptacle on the CM16a.

PORT A

through

PORT

CONNECTING TO 4-CHANNEL AMPLIFIERS

Two basic rules must be adhered to:

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

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.

POWER LED

DIAGNOSTIC LED

NETWORK STATUS LED’s

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

There are three LED’s on the front and rear panels labeled

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.

Technical Services

RCV, XMT

and

for guidance.

LINK STATUS

PORT CONNECTED LED’s-

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-

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.

The amplifiers connected to the CM16a

NETWORK- The network should be operable and QSControl

software should be installed/running on the system controller

computer.

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

ware.

of the CM16a is accomplished with QSControl soft-

The presets are useful tools, but Preset 0 acts differently than the

others. Each time the CM16a is powered up, it recalls its settings

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”.

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.

Whatever

the next time the CM16a is powered up, it’s settings are the same

as you left them. Remember, the CM16a always powers up

in Preset 0. Refer to the software documentation for further

information.

was

in Preset 0 is now gone forever. This insures that

START-UP BEHAVIOR AND PRESET OPERATING MODES-

outlined below. Some of the terminolgy is specific to QSControl

software; refer to the software’s helpfile for detailed informa-

tion.

When first taken out the box, the CM16a will power up in

a muted state with all faders at -95.5 dB., polarity set to normal,

sensitivity set to 3V, and any amplifiers connected to the CM16a

will be in STANDBY mode. This “setup” is the factory setting.

It is important to understand the start-up behavior

PRESETS- The CM16a has 16 Presets for quickly recalling

settings. They are numbered 0 (zero) through 15. These presets

are useful for quickly changing from one setup to another without

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.

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, it will start up in Preset 0 (or BYPASS in this case). This could

cause dangerously high output levels from the system.

Insure amplifier gain controls are reduced to safe levels

ANY time BYPASS mode is used.

The CM16a has all outputs momentarily muted at power-up to

prevent unexpected audio pops, clicks or thumps.

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, it will continue to operate with its last settings

intact.

Remember:

A t

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).

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.

These modes are set up and accessed using

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

position.

Note that the presets will only be recalled starting with the first

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.

transition

of the contacts (opened OR closed). For example, if we are

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 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

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-

tion.

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-

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.

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

dows-based PC’s) is started and communication established

between the PC and the CM16a.

Following is the basic procedure for starting up

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

you will need to follow your software’s instructions for establish-

ing communications through your PC’s COM (serial) port.

, a widely used version on most Win-

Hyper Terminal,

Hyper Terminal

are used,

RS-232 Communications Procedure:

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.

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

Terminal

The screen-shot below shows a typical icon-view of the

Terminal

your system was setup for a list-view, then you will instead see

a list of what’s in the folder. Identify the

icon (or name from the list) and click (or double-click as required)

to start the program. In the screen-shot below, the

nal

folder and clicking on its icon.

folder (icons shown for each program in the folder). If

icon is the fifth from the left in the row of icons.

HyperTerminal Icon

Hyper Terminal

Hyper Termi-

Hyper

program

Section 3: Operation- Serial Port I/O Interface

3) After starting

pop-up. It will require that you name your connection.Enter a name for your

new connection (example:

4) Next,

selection depends on which port on your PC the null-modem cable is

connected.

Ignore the first three entry fields (phone number information) and go directly

to the “

Connect using:

down menu selection.

Hyper Terminal,

Hyper Terminal

” entry field and click on the down arrow for the drop-

Connection Description

CM16a

) and click

needs to know how to “talk” to the CM16a. This

to continue.

window will

Select the appropriate port (COM1 is used in this example) and click OK to

continue. The

5) The

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”.

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

Properties

window will appear next (see next page).

window should appear next.

window for the selected

Bits per Second 9600

Data Bits 8

Parity none

Stop Bits 1

Flow Control Xon/Xoff

COM

port should now be active.

Section 3: Operation- Serial Port I/O Interface

6) The

Hyper Terminal

the CM16a to post its menu text. The “h” key is the Help prompt for the CM16a.

main window will appear next, but blank. Type the letter “h” (for help) and then the “Enter” key. This will prompt

7) The next screen will look similar to the

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.

Hyper Terminal

window above. After typing “h” and “Enter”, a text menu will appear. The menu

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.

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

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

SIDE

FRONT

TOP

Section 4: Specifications

Input Signal Processing

Frequency response 20 Hz–20 kHz ±0.5 dB

10 Hz–80 kHz ±3 dB

Distortion <0.01% THD+N @ +4 dBu out

(page input <0.03%)

Dynamic range >110 dB unweighted

20 Hz–20 kHz (page input >100 dB)

Polarity In-phase or inverted

Level control range -95.5 to 0 dB in 0.5 dB steps

Precision attenuator better than 112 dB below transients (“zipper” maximum output noise)

Mute >90 dB attenuation

Inputs

Program inputs 16 Paging inputs 1 Monitor bus input 1 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 (inter- >75 dB separation, 20 Hz–20 kHz channel within Data Port pair)

Crosstalk (intra- >85 dB separation, channel, between 20 Hz–20 kHz Data Port pairs) measured with all inputs and

outputs terminated

Outputs

Program outputs 16 (via HD-15)

Connector type 8 HD-15 data port connections Pinout Special, see appendix Cable type VGA monitor cable Qualified length 2 meters

Monitor output 1

Connector “Phoenix-style” (a.k.a.

“Euro-style”) detachable terminal blocks

Type Electronically balanced Grounding All shield terminals connected to

chassis

Nominal level 1V/3V rms selectable Maximum level +21 dBu Impedance 10 kOhm balanced

Type Electronically balanced Grounding Shield terminal connected to

Nominal level +4 dBu Maximum level +21 dBu Output impedance 75 Ohms balanced Output load 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

chassis

Section 4: Specifications

Power amplifier management

Power amplifier interface

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)

Amplifiers 16 amp channels grouped in pairs

Amplifier status monitor

Clip indicator Senses channel clipping Bridge mode status Sense bridge mode setting

Control room foldback monitoring

Signal monitoring buses 1 (per CM16)

Number of Channels 4

Internal signal tap points

Pre-fader input signal 16 Post-fader input signal 16 Power amplifier output 16

Monitor input Mixed with tap point signal at

unity gain

Nominal level +4 dBu Maximum level +21 dBu Input impedance 10 kOhm balanced Configuration Electronically balanced, shield

connected to chassis

Common-mode rejection Typical, >50 dB, 20 Hz - 20 kHz

Worst case, >40 dB, 20 Hz-20kHz

Protect indicator Senses amplifier protect status Temperature meter Reports amplifier operating

temperature

Over-Temp. Alert Software adjustable threshold

AC power control

AC mode control Switches amplifier between

normal and standby mode

AC power indicator Indicates operate, standby, or

power-down mode

Output Sum of Monitor input and

signal from internal monitor tap point

Frequency response 25 Hz–20 kHz ±0.5 dB Distortion <0.05% THD @ +4 dBu out Noise floor -90.5 dB Nominal level +4 dBu Maximum level +21 dBu Output impedance 75 Ohms balanced Output load 600 Ohms minimum Configuration Active balanced

Level Adjusts amplitude of signal from

tap point

Monitor in to monitor out 0 dB, ±0.5 dB Control range -95.5 to 0 dB in 0.5 dB steps

Contact closure inputs and outputs

Inputs 1 discrete input (RLY/TRG IN)

Configuration 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

Output 1 discrete output (RLY OUT)

Configuration 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

Connector “Phoenix-style” (a.k.a.“Euro-style”)

detachable terminal block connectors

Section 4: Specifications

Network Interface 10BASE-T

Physical network Ethernet, IEEE 802.3 compliant

Raw data rate 10 megabits per second Frame format D.I.X. (Ethernet) Connector RJ-45 female Ethernet type 10 Cable type CAT-3 (or better) twisted pair Max cable length 100 m to hub Grounding Floating

Factory IP Address Supplied on front-panel sticker

RS232 Port

Cable Type Null-Modem (such as “Laplink”)

Port Settings Bits per Second 9600

BASE-T

as shipped from factory

Data Bits 8 Parity none Stop Bits 1 Flow Control Xon/Xoff

Transport network TCP/IP

Internetwork protocol IP Transport protocol UDP

Application protocol QSC24

Version 1 Revision 7

Network fail-safe If network connection to the

CM16a is lost, operation will continue uninterupted

General

Physical

Height 1.72” (1 RU) Width 19” (standard rack mount) Depth 14.84” (37.7 cm), including

rear supports

Weight 11 lbs (5 kg) Mounting Rear support recommended for

portable or mobile use

Operating temperature 0 to 40° Celsius

AC Power

Voltage 100–240 VAC Current 1.1 A RMS (@ 100V)

1 A RMS (@ 120V)

0.5 A RMS (@ 230V)

Frequency 47– 440 Hz Disconnect Detachable power cord with IEC

connector

Fuses 2 Ampere, 250 Volt Rating

5mm diameter, 20 mm length

SECTION 5 : ARCHITECT’S AND ENGINEER’S 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

sixteen power amplifier input signals, the CM16a shall

provide level, mute and polarity control, pre and post fade

signal level metering and audio monitoring, and select-

able 1Vrms or 3Vrms input sensitivity.

Page Input- The Amplifier Network Monitor shall provide a page

input, separate from the normal program inputs, whose

signal may preempt the program signal of any or all of the

sixteen program channels. This input shall have select-

able 1V or 3V sensitivity.

Amplifier Output Monitoring—For each of the sixteen power

amplifier outputs, the Amplifier Network Monitor shall

provide clipping detection, short and open circuit de-

tection, voltage and current metering, and audio moni-

toring of the voltage signal.

Amplifier Management—For each of the eight DataPort con-

nections, the Amplifier Network Monitor shall provide

AC standby/operate mode control, AC power state

indication, temperature metering, load status, and

protect status detection.

Audio Monitoring Chain—For each of the sixteen program

channels, the Amplifier Network Monitor shall provide

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.

Contact Closure I/O—The Amplifier Network Monitor shall

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

Monitor shall be capable of recalling up to two Presets

by the triggering of the contact-closure sense input

alone. The user shall have the option to enable/disable

this function.

Data Network—All Amplifier Network Monitor functions shall

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.

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.

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.

Section 6: Appendix- Ethernet Cable Pinouts

ETHERNET CABLING

This diagram shows the pinout for

identically.

crossover cable

crossover cable: to connect a single system controller computer directly to a single CM16a device; and to cascade hubs that don’t have uplink

ports.

has the RX and TX wire pairs switched around at one end. There are only two likely situations that would require a

standard unshielded twisted-pair (UTP) network cable

RJ-45 pinout for standard Ethernet

patch cable (both ends identical

RJ-45 pinout for an Ethernet

crossover cable

. Both ends of the cable are wired

)

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.

Pin Signal Description

1 Ch. 1 Minus (-) Input Signal

2 AC Standby Control

3 V-MON Ch. 1 and Subcode 1

4 I-MON Ch. 1 and Subcode 2

5 Clip/protect Ch. 1

6 Hard Ground

7 Ch. 1 Plus (+) Input Signal

8 Ch. 2 Plus (+) Input Signal

9 unused for CM16a, +15V on certain amps

10 Data Reference Ground

11 Ch. 2 Minus (-) Input Signal

12 Amp IDR (model ID)]\

13 V-MON Ch. 2 and Subcode 1

14 I-MON Ch. 2 and Subcode 2

15 Clip/protect Ch.2

RS-232 PINOUT:

The diagram (right) shows the pin assignments for RS-232.

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-

Pin Signal Description

1 DCD 2 RX 3 TX 4 DTR 5 Signal GND 6 DSR 7 RTS 8 CTS 9 not used

phoenixcon.com

Riacon-

riaelectronic.com

On-Shore-

on-shore.com

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 (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

FACSIMILE (FAX) NUMBERS:

Sales & Marketing FAX (714) 754-6174

Technical Services FAX (714) 754-6173

WORLD WIDE WEB:

http://www.qscaudio.com

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

QSC Audio CM16a User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual