Rev. 5 12/07. ENVOY SYSTEM Operation Manual

Transcription

1 Rev. 5 12/07 ENVOY SYSTEM Operation Manual

2 The following declaration is applicable to equipment bearing the CE mark, manufactured for use in European Union and affiliated countries. It does not necessarily apply to non-ce marked equipment (although in many cases this will be manufactured to identical specifications). DECLARATION OF CONFORMITY The following declaration is made in application of Council directives: 73/23/EEC (Low Voltage Directive) 89/336/EEC (Electromagnetic Compatibility) It is hereby warranted that the equipment described below complies with the requirements of the European standards: EN 60065:1993 (Electrical Safety) EN :1992 (EMC - Emissions) EN :1992 (EMC - Immunity) Type of Equipment: Conference Equipment Model Numbers: DSC50, DSC100, APU100E DDU/CDU Series Discussion Units DIU6 Interface Unit I, the undersigned, hereby declare that the equipment described herein conforms to the above Directives and Standards. Full Name: Position: Graham P. Booth, B. Eng Technical Director Date: December 2007 Envoy System Operation Manual ii

3 CONTENTS SECTION TITLE PAGE 1.0 INTRODUCTION DSC DISCUSSION SYSTEM CONTROLLERS Introduction Before Use Controls And Facilities DELEGATE & CHAIRMAN UNITS Controls And Facilities OPERATING INSTRUCTIONS DSC Network Controller Delegate Units Chairman Unit INSTALLATION DSC Network Controller Delegate Units Commissioning Procedures CONFIGURATION & SETTING UP DIL Switch Settings Menu Options Feedback Suppression TECHNICAL DATA Microphone Units DSC50 Network Controller & Power Supply Unit MAINTENANCE Cleaning Fuses General APU AUXILIARY POWER SUPPLY UNITS Introduction Controls & Facilities Installation Operation 9-2 Envoy System Operation Manual iii

4 10.0 DIU6 INTERFACE UNIT Introduction Controls & Facilities Installation Configuration Operation 10-3 A1.0 FIXED DELEGATE UNIT INSTALLATION CABLING A1-1 A2.0 AUDIO INTERFACING A2-1 A2.1 Balanced Or Single-Ended? A2-1 A2.2 Output Configurations A2-1 A2.3 Input Configurations A2-3 A2.4 Interconnections A2-4 A3.0 SYSTEM CONTROL INTERFACE A3-1 A3.1 SCI Output Message Format A3-1 A3.2 SCI Input Command Format A3-3 A3.3 Enabling The SCI A3-5 A3.4 Serial Interface A3-6 USER NOTES: Envoy System Operation Manual iv

5 1.0 INTRODUCTION This manual describes the operation and installation of the Envoy series of discussion units, and their associated Discussion System Controllers the DSC50 & DSC100 (hereafter just referred to as DSC). The Envoy system is designed to fill the need for a simple, compact discussion system providing good audio performance at an attractive price. The Envoy delegate units go beyond this however, by providing features normally only found on professional conference systems costing much more, e.g. High quality cardioid electret microphone with high visibility ring luminant as used on the IDN system. Full range loudspeaker Delegate or Central control of microphones (latter with addition of PC or Manual Switching Unit). Self-Cancelling operating mode. Parliamentary (3-way) voting as standard (in conjunction with PC). Soft addressing no switches to set. Chairman unit with Priority facility. The central DSC unit also has a wealth of features, including: Configuration setup from the front panel via easy to use menu navigation system in conjunction with backlit Liquid Crystal text display. No internal jumpers to set. Built in monitoring loudspeaker. Serial control port provided as standard (for connection of PC or Manual Switching Unit). Balanced (XLR) Auxiliary Input with presettable gain to cater for signals from mic to line level. Balanced (XLR) Line Level Floor output to Interpretation, AFILS etc. Balanced (XLR) Line Level PA output to PA amplifiers. Balanced (XLR) Loudspeaker Input allows external loudspeaker signal processing. Unbalanced (DIN) Tape In/Out connector with menu Record/Play selection. Tri-colour LED audio level indicators for Auxiliary Input, PA and Output channels. Frequency shifter module option for feedback reduction. Although intended for relatively small applications, Envoy can be expanded up to 256 units with the addition of Auxiliary Power Supply Units. The Envoy system uses the latest microprocessor technology to ensure simple, rapid and flexible operation with the highest levels of reliability and quality. It allows the system cabling to be reduced to just seven conductors with no active floor splitter boxes or multi-conductor trunk cables being necessary. Envoy System Operation Manual 1-1

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7 2.0 DSC DISCUSSION SYSTEM CONTROLLERS 2.1 INTRODUCTION The DSC is the hub of the Envoy system, providing the power for the delegate units and also incorporating control and audio processing electronics. A DSC can support up to 256 delegate units, but only supplies power for around 50 (DSC50), or 100 (DSC100) units. Additional power can be provided by APU auxiliary power supply units. The DSC is versatile enough to satisfy the demands of most technicians, yet straightforward to use and unintimidating for non-technical personnel Summary of Features There follows a brief summary of features. These will be explained in greater detail in subsequent sections of this manual. PHYSICAL: Compact 2U high steel chassis. 19" rack mountable Fully enclosed with ventilated lid Case option for portable/desktop use. POWER SUPPLY SECTION: Capacity 50 (DSC50) or 100 (DSC100) Envoy delegate/chairman units Protection Overload and short circuit proof. Over-temperature shutdown. Fault alert via front panel information display panel and LED indicator AUDIO INPUTS: Auxiliary Input 1 Balanced input via XLR connector. Selectable sensitivity (-60/-40/-20/0dBu) and Phantom Power option. Priority gating option, front panel rotary signal level control and indicator. Loudspeaker Input Balanced, line level (0dBu) input via XLR connector. AUDIO OUTPUTS: Auxiliary Output Electronically balanced output via 3-pin XLR connector. Fixed level (0dBu) with level indicator. PA Output Electronically balanced output via 3-pin XLR connector. Output at nominal line level (0dBu), variable via front panel rotary control. Signal level indicator. Optional auxiliary processing (Frequency Shifter) module. TAPE INPUT/OUTPUT: 2 channel single-ended inputs and outputs suitable for use with stereo tape recorders. Via 5-pin DIN connector on rear panel. Nominal input/output level 0dBu (fixed). Record/Play switching via front panel menu system. Avoids plug swapping. MONITORING FACILITIES: Monitor loudspeaker incorporated in front panel. Monitor level adjusted via front panel rotary control. Envoy System Operation Manual 2-1

8 DSC Discussion System Controllers CONTROL FACILITIES: Alert LED for immediate warning of change in operating status. Background diagnostic function continuously scans delegate units connected to the system and displays number found. Menu options accessed via front panel LCD information display and pushbutton switches, with prompt LED indicators: - Operating Mode (Central/delegate etc.) - Live Microphone Limit - Tape Record/Playback selection - Address Setup - Gain Setting Mode - Auto-Off Mode - Control Functions (Cancel Mics, Clear Requests etc.) - Auxiliary Processing Module (Enable/Disable) Settings are stored in non-volatile memory (EEPROM) and are retained indefinitely when the power is removed. INTERFACE: Serial Input/Output. For connection to Conference Control Unit(s). 2.2 BEFORE USE 1. Read the instructions contained in this, and other manuals pertaining to the system, carefully. It is particularly important when using the equipment for the first time that the guidelines given in the Installation section of this manual have been followed. Failure to observe these could result in damage to the equipment. 2. Ensure that the DSC is positioned such that it is adequately ventilated. Do not allow the airflow around the unit to be impeded - e.g. by covering the ventilation grilles, by placing on a soft surface such as piled carpet or by installing in an enclosed cabinet. 2.3 CONTROLS AND FACILITIES Front Panel Fig. 2.1 DSC Front Panel Envoy System Operation Manual 2-2

9 DSC Discussion System Controllers 1. AUXILIARY INPUT LEVEL INDICATOR Tri-colour LED lamp which gives a visual indication of the signal level on this input channel. 2. AUXILIARY INPUT LEVEL CONTROL Rotary control with click stop off position. Varies the amount of signal passed through from this input channel. 3. PA CHANNEL LEVEL INDICATOR Tri-colour LED lamp which gives a visual indication of the signal level on the PA (output) channel. 4. PA CHANNEL LEVEL CONTROL Rotary control with click stop off position. Varies the amount of floor channel signal passed through to the PA channel. 5. ALPHANUMERIC STATUS DISPLAY (LCD) Liquid Crystal Display panel that gives information about the current system status, and is used during setting up the operating parameters. 6. ALERT INDICATOR Bi-Colour LED indicator which illuminates red or green to show the current system integrity. 7. MENU BUTTONS Five push button switches, used to navigate the menu system to set various operating parameters. 8. OUTPUT LEVEL INDICATOR Tri-colour LED lamp which gives a visual indication of the output signal level 9. MONITOR LOUDSPEAKER LEVEL CONTROL Adjusts the sound level from the front panel loudspeaker. 10. MONITOR LOUDSPEAKER Enables the output signal to be audibly monitored. 11. MAINS POWER INDICATOR Green LED indicator - illuminates when the unit is switched on. 12. MAINS POWER SWITCH Two position rocker switch used to apply power to the system Rear Panel Fig. 2.2 DSC Rear Panel 1. MAINS SUPPLY VOLTAGE SELECTOR - Two position slide switch selects either 115V or 230VAC nominal supply voltage. 2. MAINS SUPPLY INPUT SOCKET/FUSE HOLDER - IEC320 type. 3. DELEGATE ZONES - Four off 7-pin latching DIN sockets. The delegate unit strings are connected via these sockets. Envoy System Operation Manual 2-3

10 DSC Discussion System Controllers 4. SERIAL I/O 9-way "D-type" socket. Provides a serial data link between the DSC and central control units. 5. PA OUTPUT - 3-pin XLR male socket. Line level output suitable for feeding additional sound reinforcement equipment. 6. AUXILIARY OUTPUT - 3-pin XLR male socket. The output from the microphone system is available on this connector at line level for feeding to other equipment - Sound Reinforcement, Interpretation, Broadcast, Recording etc. 7. TAPE RECORDER CONNECTOR 5-pin 180 DIN connector, via which a standard stereo tape deck may be connected for record/playback. 8. LOUDSPEAKER INPUT - 3-pin XLR female socket. Accepts a line level signal which drives the loudspeakers in the delegate units. 9. AUXILIARY INPUT - 3-pin XLR female socket. Accepts signals from external equipment, hand held microphones etc. 10. DIL SWITCHES An array of 8 individual mini-switches that configure various operating parameters. Envoy System Operation Manual 2-4

11 3.0 DELEGATE & CHAIRMAN UNITS Envoy was conceived as a simple, straightforward system without the multitude of variants that are available in the IDN series for example. There are just four main variants: Portable Delegate Unit DDU103P Flush Mounting Delegate Unit DDU103F Portable Chairman Unit CDU103P Flush Mounting Chairman Unit CDU103F Portable units are housed in a free standing impact resistant moulded ABS enclosure (see Fig. 3.1). The microphone is a composite stem type with flexible section, which allows it to be folded down for storage. The microphone head incorporates a high visibility ring luminant. Cables and connectors are integral to the units, allowing them to be quickly and easily plugged together. Flush mounting versions are intended to be permanently installed in the furniture. They are mounted on a painted steel or anodised aluminium panel, which can be recessed into a cut-out in the desk or table top. A protective metal back box is normally supplied. The microphone is the same type as the portable unit, with composite stem and ring luminant. The units incorporate screw terminal blocks for connection to the installation cabling. 3.1 CONTROLS & FACILITIES The example drawing below depicts a standard DDU103P portable delegate unit Fig. 3.1 DDU103P Envoy System Operation Manual 3-1

12 Delegate & Chairman Units 1. CONTINUATION CONNECTOR Socket into which the next unit in the chain can be connected. 2. INPUT CABLE Fitted with 7-pin latching DIN plug. Connects to previous unit in chain (or DSC zone outlet). 3. MICROPHONE - Picks up sound when the unit is "live". Composite stem semi-rigid type with ring luminant. 4. LOUDSPEAKER - Provides local sound reinforcement. 5. VOTING SWITCHES & INDICATORS - Three pushbutton switches with integral red LED indicators. These are labelled + (for), 0 (abstain) and - (against). 6. REQUEST SWITCH - Pushbutton switch with integral bi-colour LED indicator. In Delegate Mode, this allows the user to turn their microphone on and off directly. In Central Mode, it is used to signal the operator that the delegate wishes to take the floor (and also to temporarily inhibit the microphone when the unit is "live"). The indicator illuminates Green to confirm that the delegate's request has been lodged at the Central Control Unit and red to confirm that the microphone is enabled. The only visible difference between Delegate and Chairman units is that on the latter, the REQUEST switch is coloured yellow. In fact, the chairman does not make requests, and this is actually a MIC/PRIORITY button. Envoy System Operation Manual 3-2

13 4.0 OPERATING INSTRUCTIONS This section describes how the equipment is used. It is assumed that the system has been set up in accordance with the instructions given in the Installation section of this manual. Reference should also be made to the Operation Manuals for any central control unit that may be connected to the system. In the text which follows, an asterisk (*) is used to indicate that further information on the subject may be found in the Installation section of this manual. 4.1 DSC NETWORK CONTROLLER Mains On/Off Mains power to the DSC is controlled by the front panel Power switch. When the DSC is turned on, DC power is applied to the delegate system (delegate and chairman units). The associated green indicator illuminates to confirm this. In a minimum system, the DSC may be the only item of mains powered equipment. In larger systems, the control equipment should be powered up in the following order: APU Auxiliary Power Supply Unit(s) DSC50/100 CPM301/2, CPM401/2 etc. Manual Switching Unit(s) Audio Equipment (amplifiers, line splitters etc.) Computer & associated equipment The system may have been installed such that the power to the equipment rack is switched by a single breaker. When first powered up, a sign-on message will be initially displayed on the DSC s LCD information panel. The Alert LED will also begin to flash normally green, but sometimes red. The LCD panel will then show the following message: Scanning Network Please wait.. During this period the unit interrogates every possible unit which may be connected to the system. The total number of units found is calculated, and after a few seconds a message of the following type is normally displayed: Mode: Central Units found: 123 This is the default display for the unit. Something other than Central may be displayed for the mode, and the number of units reported will obviously vary according to the system. Envoy System Operation Manual 4-1

14 Operating Instructions It is good practice to ensure that the number of units reported at this point is as expected. If not, the number reported will usually be less than expected. Possible reasons for this are: Some units are not connected, or not properly connected. There are some units with duplicate address settings. Auxiliary power supplies not activated Operating Mode There are two basic operating modes for the system - Central and Delegate. The current operating mode can also be changed from the DSC front panel*, or from a Conference Control Unit (e.g. CPM401 Manual Switching Unit, or a Conference Control Computer) if connected. Important - The system is reset (all microphones and requests will be cancelled) when the operating mode is changed. DELEGATE MODE This is the normal operating mode for a discussion system. It is sometimes also referred to as "Automatic" or "Emergency" mode. Basic microphone operation is possible with delegates turning their own microphones on and off. Delegate Mode must be selected if there is no central control equipment connected. When operating in Delegate Mode it is sensible to restrict the number of microphones permitted to be live to just two or three. There are two variants of Delegate Mode, which differ in respect of what happens once this pre-set limit has been reached. In Delegate/Block mode, once the pre-set number of live microphones has been reached, subsequent requests from delegates will be rejected and they are therefore blocked. In Delegate/FIFO mode, once the pre-set number of live microphones has been reached, subsequent requests are queued. As the live microphones are turned off, the requesting delegates are enabled on a First-In, First-Out basis. The number of live microphones is maintained at the pre-set limit while there are delegates in the request queue waiting to speak. Note that in this mode, a Cancel Mics operation will also clear any requests pending. The Delegate Mode variant and the permitted number of live microphones is set via the DSC s menu selection facility*. CENTRAL MODE In this mode, delegates generally have no direct control over their microphones - they can only signal a request to speak to the operator at the control unit. The control console will normally select Central Mode when powered up. Do not select this mode if there is no Central Control Unit connected Auxiliary Input If the auxiliary input channel is used, the corresponding rotary control on the front panel should be adjusted to achieve the required signal mix. The tri-colour indicator LED illuminates with varying intensity and colour according to the signal level through the Envoy System Operation Manual 4-2

15 Operating Instructions channel. At low and normal signal levels it is green, progressing through amber and then red as the signal increases. If the LED illuminates predominantly red, it is indicative that the input signal is at too high a level and is likely to overload the Auxiliary Input preamplifier. The input signal should be reduced, or the pre-amplifier gain altered*. The rotary control does not vary the pre-amplifier gain merely the amount of signal contribution from this channel to the overall floor language. If the Auxiliary Input channel is not in use, the rotary control should be turned fully anticlockwise, past the click stop. Otherwise, excess noise may be generated from an open-circuit input PA Channel Control This rotary control (marked by a loudspeaker symbol) adjusts the signal level through the DSC s PA channel. Usually (but not necessarily), this will control the sound level produced by the loudspeakers in the microphone units (if fitted), and any external PA system. This control will usually be left at a predetermined optimum setting for the particular application. If turned too low, the sound from the loudspeakers will be inadequate. If it is set too high, the sound level will be sufficient to cause acoustic feedback (howlround). As with the Auxiliary Input channel, a tri-colour LED shows the signal level through the PA channel. Note that in systems incorporating other items of audio processing equipment (line splitters, graphic equalisers, sound control consoles etc.), there may be more than one control affecting the loudspeaker levels. In these more complex cases it is advisable that alteration of settings only be carried out under the guidance of the AV technician responsible for the equipment Monitoring The rotary control in the Monitoring section adjusts the sound level produced by the integral loudspeaker. The tri-colour LED in the Monitoring section gives an indication of output signal level (from the Auxiliary Output). The output signal is not affected by the rotary control Error Reports The DSC is capable of detecting several error conditions. These will be reported to the operator via the front panel information display, attention being drawn by Alert LED flashing red. Some errors are transient and the error display will clear after a few seconds. An example of this is when a CCU is brought on/off line (e.g. switching off a Manual Switching Unit) while the DSC is running. An error of the following type will be displayed: SYSTEM ERROR SIO1 comms fail More serious errors remain displayed until the operator acknowledges by pressing the front panel OK menu button. An example of this is: MEMORY C/S ERROR Parameters reset Envoy System Operation Manual 4-3

16 Operating Instructions This might occur at power up, and is a warning that the parameters stored in EEPROM have not been retrieved correctly (checksum error detected), and have therefore been reset*. Pressing the OK menu button will clear this message. It is highly unlikely that this message will ever be seen. Another error that must be cleared by the operator is a power supply overload fault (see Installation section). 4.2 DELEGATE UNITS Microphone Operation In Delegate Mode When the system is running in Delegate Mode, delegates control their own microphones. A person wishing to speak presses their REQUEST button, whereupon the microphone will normally become "live" immediately. Pressing the button a second time switches the microphone off again. The "cough" facility (see below) is not available when operating in this mode. The number of microphones permitted to be live at any time is pre-set*. The system can be programmed* to either block requests once this limit has been reached, or to store the requests in a queue. As microphones are turned off, the queue is advanced, and requesting units are enabled on a First-In, First-Out (FIFO) basis. If there is no operator, it is important for the delegates to remember to switch their microphones off when they have finished speaking, otherwise the effectiveness of the system will be diminished and eventually new speakers will be prevented from coming on. If a central control unit is connected and there is someone to monitor the system status - albeit on a part time basis - it is still possible for them to intervene if necessary. As in Central Mode, if the chairman's priority function is engaged all microphones are inhibited. If there is no central control unit "on-line" (i.e. a DSC-only system), those microphones cancelled will not be restored again when priority is released Microphone Operation In Central Mode In Central Mode the microphones are switched on and off by an operator from a control unit - usually under the direction of the meeting chairman. To request the floor, press (and release) the REQUEST button on the unit. The integral LED indicator will illuminate green to confirm that the request has been lodged at the control unit. It is possible to subsequently cancel a request if desired by pressing this button a second time, whereupon the indicator will extinguish. Should the indicator extinguish without being cancelled in this way, the request will have been cancelled by the operator. If called to speak, the indicator will change to red, and the microphone will become "live". The microphone luminant will also illuminate. When speaking, a distance of at least 25cm (10 inches) should be maintained between mouth and microphone. It not necessary to lean over the microphone and attempt to talk directly into it; in fact this is likely to result in overloading and distortion. Speakers should avoid turning their heads away from the microphone as pickup will be diminished. Envoy System Operation Manual 4-4

17 Operating Instructions The units incorporate a "cough" facility. This means that if required, the microphone can be temporarily inhibited by pressing the REQUEST button. The red indicator extinguishes and the microphone will be inoperative while the button is held down. This only works in Central Mode. If the chairman s priority facility is used to interject while a delegate is speaking, all live microphones will be temporarily inhibited until priority is released. Microphones are switched off by the operator when delegates have finished speaking. Nb: The system may be programmed to reject requests from certain (or even all) delegate units. On these units the green indicator will flash on briefly when the button is pressed then immediately go out. Conversely, the system can be programmed to allow certain "VIP" units to bypass the request process and be turned on and off directly under the control of the delegates. Refer to the operating manual for the central control unit(s) for further information. The maximum number of live delegate microphones permitted when operating in Central Mode is sixteen. Chairman units are not restricted so the actual limits are twelve delegates plus (up to) three chairman microphones live at any time Speech Timer Indication When used in conjunction with the Manual Switching Units (CPM-401/2 etc.) speech timer function, the current speaker s microphone luminant will flash during the final minute of his speech Voting The units are equipped with three voting buttons, incorporating LED indicators. The functions (and corresponding legends) are For (+), Abstain (0) and Against (-). When a vote is started, the indicators in the voting switches will start to flash. The required vote selection can then be made, and this is confirmed by the corresponding indicator illuminating steadily. Delegates may change their vote at any time during a voting period, the selection made when the vote is closed is taken as the final one. During a Secret Vote, the vote indicator LEDs will only illuminate briefly while the vote button is pressed. Once released, all the voting LEDs will illuminate steadily to denote that a vote has been registered. Any microphones that were live at the start of the vote will remain active - unless the operator cancels them. Microphones can be turned on and off by the operator during voting and it is also possible to make and cancel requests. Envoy System Operation Manual 4-5

18 Operating Instructions 4.3 CHAIRMAN UNIT The Chairman Unit provides special microphone facilities and is intended for use by the person presiding over the meeting Microphone Operation The chairman unit does not make requests. The microphone is always activated directly by the MIC/PRIORITY switch, regardless of operating mode (Central or Delegate). The microphone is turned on when the button is pressed for the first time, and off when pressed a second time (i.e. the same as the delegate units when in Delegate Mode) Priority Facility This is mainly what differentiates the chairman unit from normal delegate units. When Priority is engaged, the chairman microphone is enabled, but any other active delegate microphones in the system are turned off, and no delegate microphones can be turned on while it remains in force. This is useful for restoring order in a meeting. The Priority function is engaged by pressing and holding down the MIC/PRIORITY button for more than a second or two. The red indicator incorporated in the button flashes while Priority is engaged. Priority is relinquished once the button is released, and the microphone also turns off Central/Delegate Modes Any Central Control Unit connected to the system (PC or MSU) will record any units turned off when the chairman's priority is engaged, and will restore them when priority is released. This happens regardless of whether the system is operating in Central or Delegate Mode. If there is no central control unit on-line, delegate microphones turned off when priority is invoked will not be restored afterwards. The reasoning behind this is that if there is no central control unit, judicious use of the priority function by the chairman can prevent problems caused by delegates accidentally leaving their microphones on when they have finished speaking. Otherwise it is assumed that the operator takes responsibility for this task Voting In general, voting facilities for the chairman are similar to those for the delegates Multiple Chairman Units It is possible to have up to three chairman units on the system at a time. The additional units will be pre-programmed with unique addresses*. All units have equal status and will not be affected by Priority being invoked on another chairman unit. Envoy System Operation Manual 4-6

19 5.0 INSTALLATION Please read this section carefully before use as some of the following information relates to the safe operation of the equipment. 5.1 DSC NETWORK CONTROLLER Mains Power Supply The mains supply to the DSC can be nominally either 115 or 230VAC. The equipment is designed to operate from supplies within ±10% of the specified supply voltage, and frequency in the range 50-60Hz. The setting for the unit is determined by the voltage selector switch on the rear panel of the unit. Ensure that the operating voltage stated is in accordance with the supply to be used. The following procedure describes how the operating voltage can be changed to the alternative setting, if necessary. 1. Ensure that the unit is completely disconnected from the mains supply, and from any other equipment. 2. Locate the voltage selector switch on the rear panel, above the mains inlet. 3. Slide the actuator fully across to the required position. A tool may be required to achieve this (e.g. small screwdriver or ball point pen). 4. Change the mains fuse in the rear panel holder to the correct value for the new supply voltage (see Maintenance section). Amend the rating plate on the rear panel (where applicable) to show the new operating voltage. A mains lead is supplied with the unit terminated in an IEC320 connector. The other end may be fitted with a moulded plug according to local market requirements, if known. Alternatively, an unterminated lead may be supplied. This should be connected to a suitable mains outlet observing the following wiring code: The unit MUST be earthed. DSCs are microprocessor based. As with most equipment of this nature, a clean, reliable mains feed is required. The discussion system should preferably be supplied from a separate feed direct from the incoming mains distribution board. A clean "technical earth" is also advisable. Normal precautions should be taken to avoid the possible introduction of earth loops that could give rise to interference on the audio signals. These include ensuring that all equipment in the system shares the same mains earth. Metal panels Envoy System Operation Manual 5-1

20 Installation (fixed systems) are earthed via the network wiring and should not be separately connected to mains earth. It is sometimes more convenient to leave all units in a system turned on and switch the mains supply to the equipment rack via a single breaker. Note however that the inrush current taken by high powered equipment such as the DSC50/100, APU, and most audio amplifiers can be many times the rated continuous current. Breakers and fuses should be rated accordingly Mounting The DSC will often be used as a free standing unit if fitted with the optional protective sleeve. Alternatively, it can be mounted in a 19 rack or cabinet along with associated equipment. However it is mounted, there must be adequate airflow to allow the unit to dissipate heat. In particular, airflow around the top and bottom ventilation slots should not be obstructed (e.g. by standing on carpet or mounting other equipment immediately above and below). Excessive temperature rise can shorten the life of some components and cause degradation which may lead to failure possibly leaving them in a dangerous condition. This applies not just to the DSC, but also to other equipment which may be installed in a cabinet. Therefore, it is important that the cabinet itself is adequately vented. The DSC is a relatively heavy unit, and slide rails must be used to support the unit if fitted within a cabinet. The front panel fixings alone must not be relied upon to support the weight of the unit. If the cabinet is to be transported, the DSC should ideally be removed, and packed separately. If this is not feasible, a retaining bar should be fitted above the unit to prevent movement in that direction. The cabinet should then be securely packed and transported on its rear side so that the unit is suspended from its front panel. The above comments also apply to Auxiliary Power Supply units and other heavy items of equipment e.g. audio and induction loop (AFILS) amplifiers Delegate Network Connections Connection to the Delegate Network is via four zone connectors. These are of the 7-pin DIN type incorporating a latching mechanism to prevent accidental disconnection. Portable systems are usually straightforward. Delegate (and chairman) units simply plug together, using extension cables as required. In fixed systems however, some installation cabling will normally be required. If four, or less, network cables are involved, they can be terminated directly in the 7-pin DIN plugs normally supplied with the DSC. If more, they will either connect via a termination cabinet, or into one or more Auxiliary Power Supply Units. Wherever possible, take care to evenly distribute the total number of units evenly on the available zones. For example, with 40 units connected to a DSC50, aim to connect 10 to each zone. Internally, this unit has a split power supply, with 50% of the total power being available on zones 1 & 3, and the other 50% on zones 2 & 4. Thus, one should certainly aim for a 50:50 split across these two zone groups if the system is approaching the maximum capacity of 50 units. For smaller systems, say 15 units or below, this is not necessary. Envoy System Operation Manual 5-2

21 Installation Sub-dividing the system into as many zones as possible also makes it easier to trace faults in the system by isolating them down to individual runs of a relatively small number of units. As a rule of thumb, do not connect more than 25 units to a zone, and do not use more than 50 metres of extension cable on any one zone Chairman Connections Chairman units can be connected anywhere on the network just like normal delegate units Auxiliary Output The DSC has one auxiliary output for the floor signal. This is at a fixed 0dBu nominal level, and is via a male 3-pin XLR connector as per convention. Connections are as shown below. These outputs are electronically balanced and should ideally be connected to equipment with balanced inputs to minimise signal degradation and interference. However, they may also be connected to equipment with single ended inputs. See appendix 3 for further details. It is not good practice to connect more than one item of equipment to a single output, and in some cases, additional feeds will be required. The solution is to use a Line Splitter. The LSP-6X, for example, may be fed from one of the auxiliary outputs, and will provide 6 separate transformer balanced line level outputs PA Output The PA channel output is identical in characteristics to the auxiliary output (i.e. 0dBu, electronically balanced via a 3-pin male XLR connector). However, the output level varies in accordance with the loudspeaker control on the front panel. It should also be noted that the PA channel output may be routed via an internal sound processing module (see Setting Up and Configuration sections for further details). The PA output is intended to feed one or more external sound reinforcement amplifiers. However, in circumstances where there is no sound reinforcement of any kind internal, or external the PA output can be used as another general-purpose output Auxiliary Input The auxiliary input may be used to introduce signals from hand-held and/or radio microphones, audio visual equipment etc. Connection is via a female 3-pin XLR connector on the rear panel. The inputs are electronically balanced and for best results should be connected to balanced sources, although unbalanced sources may also be connected. The input sensitivity may be adjusted in four steps to accommodate nominal signal levels of 0, -20, -40 or -60dBu. A common requirement is for a dynamic microphone to be connected, and in this case the sensitivity would be set to 60dBu (or perhaps -40dBu for close talking). The Auxiliary Input can be configured so as to be subject or immune to the Chairman Priority function. Please refer to the Configuration section for further information. Envoy System Operation Manual 5-3

22 Installation Figure 5.1 opposite shows a view on a female XLR socket as used for the Auxiliary Input. Pin allocations are the same for all XLR connectors used on the DSC and are as follows: Pin Function 1 Shield (Ground) 2 Audio + (Hot) 3 Audio (Cold) Figure 5.1 XLR Socket Loudspeaker Input This input is for the signal that drives the loudspeakers in the delegate units. Again, it is a balanced input of 0dBu nominal sensitivity. There is no gain control on this input the level of any signal applied must be externally controlled. A minimum system would simply have the PA channel output, and the Loudspeaker Input, linked so as to cause the sound being picked by the microphones to be replayed over the loudspeakers. This could be achieved by linking the two connectors via a short lead, but can also be effectively achieved by setting one of the DIL switches on the rear panel (see Configuration section). This frees the PA channel output (e.g. to feed an external PA amplifier), and the Loudspeaker Input (e.g. to accept a signal from AV equipment). The fact that the Loudspeaker Input can be separated from the PA output allows the audio signal to be processed by external equipment if required - e.g. graphic and parametric equalisers, a frequency shifter or mixer - or simply level controlled remotely Tape Input/Output A standard domestic, or semi-professional grade, stereo cassette deck may be connected via this outlet, a 5-pin 180º DIN socket. Signal levels are at nominal 0dBu, connections are in accordance with IEC 268 (part 11) and are shown in Fig. 5.2 below. Standard audio cables may be used according to the type of recorder in use. Envoy System Operation Manual 5-4

23 Installation SCREEN OUTPUT (R) INPUT (R) OUTPUT (L) INPUT (L) Figure 5.2 Tape Input/Output Socket Since the output of the DSC is monophonic, the signals appearing at the output terminals will be identical. Either or both signals may be used. Signals applied to the input terminals are combined within the equipment to form a single (mono) signal. If the source is a single monophonic signal, pins 3&5 should be linked, and the signal applied to both. The connector accepts signals from a tape machine for replay purposes; these are combined with the floor signal. Most recorders output the signal being recorded, and with a full audio connection, these would then appear back at the input pins on the DIN socket. To prevent this having a drastic effect on the signal level, or an electronic feedback loop being established, Record/Playback switching is necessary. This is implemented via the Front Panel Menu System. Warning: The 7-pin DIN zone outlets will accept a 5-pin DIN plug as used for the Tape Input/Output. Every care should be taken to avoid this being done accidentally as it may result in equipment malfunction or damage Serial I/O Connector The DSC can connect to a Central Control Unit - e.g. a Manual Switching Unit (CPM401 etc.) or a Conference Control Computer. With no such unit connected the system is only capable of being operated in Delegate Mode. Communications are via a serial link (RS-232C type), available on a 9-way female "D" type connector. This can be connected directly to the COM port of an IBM-compatible PC via a pin-to-pin cable. To connect to the 25-way D-type serial I/O connector on an SIOD-8, or Manual Switching Unit, a six-core screened cable is required, made up as follows: Pin (DB25) Wire Colour Pin (DB9) 2 Red 2 3 Blue 3 4 Green 8 5 Black 7 6 Yellow 4 7 Shield 5 20 White 6 Envoy System Operation Manual 5-5

24 Installation 5.2 DELEGATE UNITS Portable Units Portable delegate units require very little in the way of installation. All that is required is to plug them together. Extension leads can be used for longer runs and to connect back to the DSC. Above 25 units or so it is wise to feed groups of units from separate zones Fixed Units Installation will usually involve terminating the delegate network cables (Belden 8777 type) onto screw terminal blocks on the units. The relevant connections are described below. Refer also to Appendix 1, which describes the proper procedure for preparing and terminating the network cabling. Two types of cable are commonly used. The ET69282 cable is a specially flexible black cable as used on the portable units. It is more suited for making up extension cables etc. This cable is available via the sales office. For fixed installations, Belden 8777 is recommended. This cable incorporates three twisted pairs of 22awg conductors, each pair being individually foil screened. Screen continuity is ensured by drain wires, which for this application are combined at each end to provide a single screen connection. The cable is overall sleeved to a maximum diameter of 8.0mm. Similar cables are available from other manufacturers - some even described as equivalent to Belden However, many are unsuitable and are known to cause interference, which is audible over the delegate unit loudspeakers. IMPORTANT THE CABLE USED FOR THE DELEGATE NETWORK WIRING IS CRITICAL. THE SPECIFIED TYPE, OR AN APPROVED EQUIVALENT MUST BE USED. THE PROPER PERFORMANCE OF ANY SYSTEM WIRED USING NON-APPROVED CABLE CANNOT BE GUARANTEED. Envoy System Operation Manual 5-6

25 Installation Figure 5.3 below shows the arrangement of the terminal block used on fixed units. Figure 5.4 shows the pinout of the 7-pin DIN zone connectors as viewed on the terminals of the plug. Figure 5.3 Fixed Unit Terminals Fig Pin DIN Terminals The table below shows the signal names, wire colours and terminal assignments for the various cables and connectors used on the system. SIGNAL WIRE COLOUR (Belden 8777) WIRE COLOUR (ET69282) TERMINAL NO. (Screw Terminals) PIN NO. (DIN Plug) Audio+ Green Blue 1 5 Audio- Black White 2 3 Ground Shield Shield 3 2 Power+ Red Blue* 4 7 Power- Black White* 5 6 Data+ White Red 6 4 Data- Black White 7 1 * These are the thicker of the Blue/White pairs. It is vital that the Audio, Power and Data signals remain in their respective twisted pairs. The pin assignments are identical to those of the IDN system, although the connector types are different. The Envoy, IDN (and SDM) systems are not compatible however, and equipment should not be interchanged between them. Units are effectively connected in parallel. There are therefore few restrictions as to the way in which units are cabled. Seat rows can be spurred off from trunk runs, using junction boxes as necessary. Ring configurations can be used, with both ends of a zone cable coming back to the DSC for increased reliability. Do not however, connect the feed and return cables to different zone connectors on the DSC (or Auxiliary PSU). If junction boxes are required it is recommended that factory supplied items are used. These generally have a number of screw terminal blocks mounted on a printed circuit Envoy System Operation Manual 5-7

26 Installation board, which bus the connections through. When using these, adopt the same connection scheme as for the delegate units. This avoids confusion and potential interference problems. Earthing arrangements should be considered carefully. Factory supplied equipment will generally have exposed metalwork (e.g. connector shells, panels and microphones) returned to system ground via the screen of the installation cable. This in turn will be returned to mains earth via the DSC. This arrangement provides electrical shielding and prevents electrostatic build up. It should not be regarded as a safety earth. Such metalwork should not be independently returned to mains earth because this would very likely result in "hum loop" problems. Metal trunking and junction boxes can be mainsearthed, provided that the cable screens remain isolated from them. For larger systems the number of units which can be connected to a single cable run may become an important consideration. This aspect of system design is considered in detail in an appendix at the end of this manual. Many systems incorporate a combination of unit types. Some mainly fixed systems can also incorporate portable and/or roving delegate units. Sockets may be wired into the network at appropriate points to facilitate connection of these units as required. Each section of wiring should be checked using a continuity tester before connection to the delegate units to ensure that open and short circuits have not been introduced. Take particular care to ensure that the black wires have not become swapped between pairs. To check for this, put the tester across a pair at the start of the run - e.g. on the DIN connector at the DSC end. Get an assistant to short the pair at the other end of the run and check that continuity is recorded. Do this also for the other pairs. The continuity of the screen can be verified using a similar technique - e.g. measure between pins 2 and 7 of the DIN connector and get the assistant to short the screen and red wires (assuming 8777 colour code) at the other end. The assistant should then move down the system and the exercise should be repeated. This may seem a tedious process but it can save a great deal of valuable commissioning time. It is the responsibility of the installation team to ensure that all possible mistakes have been identified and rectified before handing over to the commissioning engineer. 5.3 COMMISSIONING PROCEDURES Portable Systems Portable systems do not require much in the way of commissioning. It is enough to check that the units have been plugged together correctly and that the addresses have been set (see Configuration section). All factory-supplied equipment will have been tested and it should therefore only be necessary to check and set up the system (see below). If there are any cables which have been made up locally, follow the procedures outlined below for fixed systems. Nb: Do not connect and disconnect units while the system is powered up. This can disrupt the operation of the system and possibly cause damage. Envoy System Operation Manual 5-8

27 Installation Fixed Systems Commissioning should only be carried out by, or under the supervision of, a competent engineer. If not carried out properly, the system can take a long time to "unravel" - particularly if more than a few mistakes have been made during installation. There is also a risk of causing serious damage to the equipment. The worst possible thing that can be done is to simply connect everything up and throw the mains switch on the DSC, without any checking. Adequate time should be allowed for commissioning so that it can be carried out logically and progressively. The system should be subdivided into sections of 5-10 units (each section could correspond to a row of seats for example). Initially, every section should be isolated from the main trunk (zone) cables. Concentrate on one zone at a time. First carry out continuity measurements and verify there are no shorts between the pairs and/or the screen. It is also a good idea to check that all conductors are isolated from mains earth (shorts can occur if cables get trapped in trunking for instance). If a termination cabinet is used which was not factory supplied, this should also be checked. Start with one zone and check correct operation, good sound quality etc. If all does not appear well, try a different zone, or just a small number of units. Once satisfied, build up the system in stages by adding zones/units until all are connected and working. The vast majority of problems are caused by wiring faults, including open and short circuits. Common problems when using 8777 cable are crossed connections between black wires of different pairs. Also, if the insulation on one of the cores is nicked during cable preparation, the drain wire can easily short to the inner conductors, sometimes intermittently. It is possible to make some simple DC voltage checks with a multi-meter. The voltages to be expected on the zone cables are approximately as follows: Signal Pin No. Wire Colour* Voltage/Signal Power+ 7 Red +15VDC Power- 6 Black -15VDC Audio+ 5 Green 0V Audio- 3 Black 0V Data+ 4 White 3V approx. Data- 1 Black 2V approx. *Belden cable colours. Signals are measured with respect to 0V (cable screen), which corresponds to pin 2 of the DIN connectors. To check microphone operation, set the DSC into Delegate Mode. Remember that switch no. 2 of the rear panel switch array must be set downwards for the signal to appear over the delegate loudspeakers, and the units must have been pre-addressed (they will generally come from the factory with addresses set). Also remember that a single unit connected on the system cannot be checked in this way as it will mute it's own loudspeaker when the microphone is made live. At least two units are required to be operative. Envoy System Operation Manual 5-9