PWS-4 - Uncategorized ELECTRO-VOICE - Free user manual and instructions

Product Type	Programmable Wall Station Front Unit
Model	PWS-4
Brand	Electro-Voice
Dimensions (W x H x D)	48 x 105 x 34 mm
Weight	80 g
Supply Voltage	5 V DC (via PWS-C coupler)
Current Consumption	35 mA
Power Consumption	175 mW
Button Configuration	4 programmable buttons with green status LEDs, 2 Up/Down buttons, 4-LED chain
Communication Interface	CAN-Bus (via PWS-C coupler)
Maximum Front Units per Coupler	3 (daisy-chained)
Configurable via	IRIS-Net software
Operating Temperature Range	-5 °C to +40 °C
Certification	CE, FCC Part 15, ICES-003
Intended Applications	Stadiums, theaters, cruise ships, schools, airports, conference centers, etc.
Cleaning Instructions	Clean only with a dry cloth
Safety Precautions	Do not expose to rain or moisture; connect only to mains with protective earthing
Firmware Update	Via IRIS-Net
Diagnostic Mode	Yes – query hardware parameters without dismounting

Frequently Asked Questions - PWS-4 ELECTRO-VOICE

What is the PWS-4 and how does it work?

The PWS-4 is a programmable wall station front unit by Electro-Voice. It allows local control of audio systems via CAN-Bus. It connects to a PWS-C CAN-Bus coupler and is programmed using IRIS-Net software.

How do I install the PWS-4?

Mount the PWS-4 together with a PWS-C coupler into a US-type wall box. Connect additional front units in series using the supplied cables. Ensure all DIP switches on the PWS-C are set correctly for baud rate, termination, and CAN address.

What is the purpose of the CAN-Bus termination?

Termination with 120 Ω at both ends of the CAN-Bus prevents signal reflections and data errors. Use DIP switch contact 4 on the PWS-C to enable the internal terminator if the device is at an endpoint.

How do I set the baud rate on the PWS-C?

Use DIP switches 1-3 of the TERM/BAUD switch. Options range from 10 kbit/s to 500 kbit/s. Set to PROG mode (all switches ON) to change baud rate via IRIS-Net. All devices on the bus must use the same baud rate.

How do I assign a CAN address to the wall station?

Set the ADDRESS DIP switch on the PWS-C to a unique hexadecimal value between 01 and FA. Address 0 disconnects the station from the bus. Each station must have a unique address to avoid conflicts.

What does the CAN Status LED indicate?

The LED shows the operating state: continuously lit during firmware update, slow blink (every second) for normal operation with no data, fast blink for find function, and double blink for error state.

How do I use the diagnostic mode?

Press any button for 5 seconds to enter diagnostic mode. The upper four buttons then display: button 1 shows CAN status and DIP fault, button 2 the low-order digit of CAN address, button 3 the high-order digit, and button 4 the baud rate setting.

Can I update the firmware?

Yes, firmware updates are performed via IRIS-Net. If an error occurs, simply restart the process. The current firmware is included in the IRIS-Net package.

What are the power requirements?

The PWS-4 operates on 5 V DC supplied by the PWS-C coupler. The coupler requires a 9-58 V DC power source. Total power for a station (e.g., 1 PWS-C + 1 PWS-4 + 2 PWS-6) is about 955 mW.

What safety precautions should I follow?

Do not expose the device to rain or moisture. Connect only to a mains socket with protective earthing. Unplug during lightning storms. Refer all servicing to qualified personnel. Use only accessories specified by the manufacturer.

USER MANUAL PWS-4 ELECTRO-VOICE

Mounting and Configuration 8

Initial Operation 10

Hardware Configuration 11

CAN-Status-LED 15

Connection 15

Find Function 17

Diagnostic Mode 17

Automatic Configuration 18

Firmware Update 18

CAN-Bus Principles 19

INHALT

Einführung 23

Überblick 23

Declaration of Conformity 44

Setting CAN-Address via DIP-Switch ADDRESS 45

IMPORTANT SAFETY INSTRUCTIONS

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 persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth
7. Do not block any ventilation openings. Install in accordance with the manufacture's instructions.
8. Do not install near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or the grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

1. Unplug this apparatus during lightning storms or when unused for a long period of time.
2. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
3. Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids, such as vases, are placed on the equipment.
4. To completely disconnect this equipment from the AC Mains, disconnect the power supply cord plug from the AC receptacle.
5. The mains plug of the power supply cord shall remain readily operable.

Management of WEEE (waste electrical and electronic equipment) (applicable in Member States of the European Union and other European countries with individual national policies on the management of WEEE) The symbol on the product or on its packaging indicates that this product may not be treated as regular household waste, but has to be disposed through returning it at a Telex dealer.

IMPORTANT SERVICE INSTRUCTIONS

CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel.

1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance.
2. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is connected to the mains.
3. Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage.
4. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure), respectively between the mains poles has to be 3 mm and needs to be minded at all times. The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the locations where the appliance is being serviced have to be strictly obeyed. This applies also to any regulations about the work place itself.
8. All instructions concerning the handling of MOS-circuits have to be observed.

NOTE: SAFETY COMPONENT (MUST BE REPLACED BY ORIGINAL PART)

1 Introduction

1.1 Overview

The programmable wall stations of the modular PWS system (Programmable Wall Station) allow local control and operation of various devices and systems via CAN-Bus. A programmable wall station lets you control several functions, for example: source selection, volume control, muting or powering on/off devices. In addition, using a suitable central control unit allows controlling a variety of facilities in a building (light, heating/air condition, etc.).

The minimum configuration for the operation of a programmable wall station consists of:

• A front unit (e.g. PWS-4)
• A CAN coupler (PWS-C)
- A software configuration created in IRIS-Net™ and transferred to the programmable wall station via CAN-Bus
- A CAN-Bus master unit to be controlled (e.g. Electro-Voice NetMax N8000)

The front units represent the part of the programmable wall station for the user to access, i.e. the user interface. Different front units with differing numbers and types of controls or indicators are available. A number of front units grouped in a single programmable wall station have to be connected in series, with up to three front units connected to a single bus coupler.

The CAN-Bus coupler PWS-C provides connection between front units and the CAN-Bus. The maximum number of units connected to a CAN-Bus (e.g. PWS-C, Remote Amplifier, etc.) depends on employed central control unit. Please consult the corresponding manuals.

CAN-Bus coupler PWS-C Front unit PWS-4 Front unit PWS-6

1.2 Applications

PWS panels can be included in any audio installation, for example:

• Stadiums and theaters
- Cruise ships
- Multi-purpose halls
• Schools and Universities
• Government agencies
• Airports
- Theme parks
• Exhibition centers and museums
• Conference centers and hotels

1.3 IRIS-Net™

When shipped, programmable wall stations have not been configured yet. The programming of control and indication functions is done using the PC software IRIS-Net™ (Intelligent Remote & Integrated Supervision). After transferring the custom configuration to the programmable wall station, the PWS becomes functional and it is able to control the system components (N8000, remote control amplifiers, etc.) independent of a PC or IRIS-Net™. Simultaneous Control from a PWS and IRIS-Net™ is possible.

The IRIS-Net™ help files contain all the information on configuration, operation and monitoring of all programmable wall station functions. The following illustration shows an example of a PWS system in IRIS-Net™.

Illustration 1.1: PWS system in IRIS-Net

2 CAN-Bus coupler PWS-C

The CAN-Bus coupler PWS-C provides connection between front units (e.g. PWS-4) and the CAN-Bus. The CAN-Bus coupler registers the activation of controls on the connected front units and sends the needed information via CAN-Bus to the devices to be controlled, but also directs information received from the CAN-Bus to the control units for indication. The CAN-Bus coupler offers connectors for CAN-Bus and power supply as well as DIP switches for the CAN-Bus configuration (baud rate, bus termination and CAN-Bus address). The CAN-Bus coupler PWS-C is suitable for European and US-type flush-mount boxes.

Front view:

1 Connector for the front unit
2 Connector for future extensions

Rear view:

1 DIP switch TERM/BAUD for setting baud rate and termination of the CAN-Bus (see page 11)
2 DIP switch ADDRESS for setting the CAN-address (see page 14)
3 CAN Status-LED for monitoring communication on the CAN-Bus
4 Terminal for CAN-Bus and supply voltage (see page 15)

Default settings:

Parameter Value
Baud rate PROG mode (10 kbaud, changeable via IRIS-NetTM)
Termination off
CAN-Bus address 00 (CAN-Bus off, Stand-alone)

3 PWS Front Unit PWS-4/PWS-6

PWS-4 and PWS-6 are front units of the modular PWS system. They are meant for installation in a US-type wall box. Typical applications are: source selection, volume control and preset-switching.

All controls and indicators of the front units are freely configurable via IRIS-Net™. Individually labeling the controls and indicators according to their assign functions is possible after removing the label field cover. The front units PWS-4 or PWS-6 are being used in combination with the CAN-Bus coupler PWS-C. Up to three front units can be operated on a single PWS-C.

3.1 PWS-4

The PWS-4 has in total 6 buttons, with the upper four buttons having a separate Status-LED, each. The two lower buttons can be used as Up/Down buttons. The set parameter status is signaled via LED-chain.

Front view:

1 Status-LEDs for the function keys (3)
2 Label field
3 Freely configurable function keys
4 Up/Down buttons
5 LED-chain indicates a parameter's value that has been changed using the Up/Down buttons (4)

Rear view:

1 Connector for the PWS-C or input socket (IN) for connecting the PWS-4 to the previous front unit in the chain
2 Output socket (OUT) for connecting the PWS-4 to the next front unit in the chain
3 Mechanical lock for the PWS-C plus cover

3.2 PWS-6

The PWS-6 has 6 buttons with Status-LEDs.

Front view:

1 Freely configurable function keys
2 Label field
3 Status-LEDs for the function keys (1)

Rear view:

1 Connector for the PWS-C or input socket (IN) for connecting the PWS-6 to the previous front unit in the chain
2 Output socket (OUT) for connecting the PWS-6 to the next front unit in the chain
3 Mechanical lock for the PWS-C plus cover

3.3 Mounting and Configuration

The front units PWS-4 or PWS-6 are connected with two screws to the CAN-Bus coupler PWS-C (see page 11). All front units of a programmable wall station have to be connected in series. Front units are daisy chained by connecting the output socket (OUT) of a front unit to the input socket (IN) of the next unit in the chain.

NOTE:

Connecting sockets of the same type (IN to IN or OUT to OUT) is not permissible.

Only the supplied connection cables should be used for proper operation. The following illustration shows the connection of two front units of a programmable wall station.

Technical line drawing of an electrical connector assembly (no text or symbols)

Abbildung 3.1: Connecting two front units of a programmable wall station

Other than connections, no physical configuration of the front units is required, as the assignment of functions and other configurations are performed in IRIS-Net™. Adjacent front units have to be installed and connected in the following order: from left to right and from top to bottom.

4 Initial Operation

When shipped, PWS panels have not been configured yet. The following illustration provides an overview of the entire procedure of installing and configuring a PWS for the first time. Please also refer to the descriptions of other connected devices in the corresponding chapters as well as the IRIS-Net™ on-line help feature.

graph TD
    A["Screw CAN-Bus coupler and a front unit together, connect additional front units"] --> B["Connect all cables, configure DIP-switches (baud rate, termination, CAN-address)"]
    B --> C["Power-on the central control unit and power supply of the programmable wall station"]
    C --> D["Connect the control unit to PC/IRIS-Net"]
    D --> E{According to IRIS-Net, is the CAN-Bus okay?}
    E -->|No| F["Localize faults and fix them"]
    F --> E
    E -->|Yes| G{Have all units been detected that are connected to the CAN-Bus?}
    G -->|No| H["Localize faults and fix them"]
    H --> G
    G -->|Yes| I["Transfer the configuration to the programmable wall station"]
    I --> J["Perform a test: test all user functions"]
    J --> K["Label the frontal control unit, replace the cover(s)"]
    K --> L["The PWS system is ready for operation"]
    L --> I
    A --> M["See chapter PWS-C, PWS-4, etc."]
    B --> N["See chapter "Hardware Configuration""]
    G --> O["Configure the programmable wall station in IRIS-Net"]
    G --> P["Check the configuration in IRIS-Net ("Offline Test")"]

NOTE:

The system automatically recognizes and configures spare units (see page 18)

Mounting a Programmable wall station in a US Single Gang Wall Box

For mounting a programmable wall station you have to lock the PWS-C and a front unit of a programmable wall station together using two screws. Using the supplied connection cables, connect additional front units. Please also refer to this manual's corresponding chapters describing the connection procedure for the front units being used.

4.1 Hardware Configuration

The DIP-switches of the PWS-C allow setting the baud rate (page 11), termination (page 13), and CAN-address (page 14). An overview of default DIP-switch settings is provided on page 6.

Baud Rate

CAUTION: All devices on the CAN-Bus have to be set to the same baud rate.

Determination of a suitable baud rate

The maximum allowable baud rate of the CAN-Bus is indirect proportion to the bus length. For smaller networks, baud rates of up to 500 kbit/s are possible. Large networks require a lower baud rate (down to the minimum baud rate of 10 kbit/s). The following table illustrates the relationship between baud rate and bus length, i.e. network dimensions. Generally, bus lengths over 1000 meters should always employ CAN-repeaters.

Baud rate (in kbit/s)	Bus-length (in m)
500 100
250 250
125 500
62,5 1000
20 2500
10 5000

Table 4.1: Baud rate and Bus-length in CAN-networks

Setting the Baud Rate

Setting the bus coupler's baud rate is possible by using switches 1, 2 and 3 of the TERM/BAUD DIP-switches. Potential baud rates and corresponding switch settings are shown in the following table. Only when set to PROG Mode, it is possible to change the programmable wall station's baud rate via IRIS-Net™. With all other switch settings, the previously selected value for the baud rate is maintained.

A dark shaded field in the table marks the default value when shipped. In PROG mode, the default data rate is 10 kbit/s.

DIP switch TERM/BAUD			Baud rate (in kbit/s)
Switch 3 Switch 2 Switch 1
OFF OFF OFF 10
OFF OFF ON 20
OFF ON OFF 62.5
OFF ON ON 125
ON OFF OFF		250
ON OFF ON		500
ON	ON OFF not available
ON	ON ON PROG mode

Table 4.2: Setting the baud rate

NOTE: Changing a previously set fixed baud rate is not possible via IRIS-Net ^™ . The PWS must be in PROG mode to allow the changing of the baud rate via IRIS-Net ^™ .

Setting a default baud rate in PROG mode

As shown in the above table, setting a fixed baud rate is possible when connecting a PWS-C to an already existing CAN-Bus. When connecting a PWS-C in PROG mode, setting the baud rate directly on the PWS-C is possible by following these instructions:

1. Activate the power supply of the PWS-C
2. Set the desired baud rate using the DIP-switch TERM/BAUD (see page 12)
3. Wait until the new baud rate is adopted, which is signaled by a dimmed CAN-Status-LED.

NOTE:

The CAN-Status-LED light for 3 seconds whenever changes are applied to the DIP-switches with the power supply being activated. The new setting is adopted only when the CAN-Status-LED is dimmed.

1. PROG mode settings with DIP-switch TERM/BAUD (see page 12)

The PWS-C can now be taken into operation with the baud rate set under step 2.

Termination

Both ends of a CAN-Bus have to be terminated using a 120 Ω terminator. Missing or erroneous termination can result in malfunction. Contact 4 of DIP-switch 1 allows activating the PWS-C's integrated terminator (see the following table).

A dark shaded field in the table marks the default setting when shipped.

DIP switch 1, Contact 4 Termination
OFF open
ON	closed (120 Ω)

Table 4.3: CAN-Bus Termination

The following illustration provides an example of a NetMax-Systems, with Remote Power Amps and programmable wall station being connected via CAN-Bus. Both ends of the CAN-Bus are terminated using terminators.

graph TD
    A["Computer"] --> B["ETHERNET"]
    B --> C["N8000"]
    C --> D["N8000"]
    D --> E["TO AMP 1"]
    D --> F["TO STATION 1"]
    D --> G["DIP SWITCH TERM/BAUD CONTACT 4 ON"]
    D --> H["WALL STATION 6 PWS-C"]
    C --> I["AMP 1 AMP 2 AMP 3 AMP 4 AMP 5 AMP 6"]
    C --> J["CAN BUS FROM AMP 5 AMP 6 REAR PANEL"]
    C --> K["CAN BUS FROM STATION 5"]

CAN address

CAUTION:

To prevent network faults, each CAN address may exist once only throughout a system. Conflicts on the network would be the result.

Every programmable wall station has to have a unique CAN address to be identified on the CAN-Bus. The usable address range is: 1 (01 hex) up to 250 (FA hex). The PWS-C's ADDRESS DIP switch (see page 6) allows specifying the CAN address by setting a two-digit hexadecimal number. A table of possible CAN addresses and corresponding DIP-switch settings is provided on page 45.

The default CAN address when shipped is 0 (00 hex).

NOTES:

Various programmable wall stations of a system can be easily configured when their CAN addresses are in consecutive order.

A programmable wall station is disconnected from the CAN-Bus when its CAN address has been set to 0.

If the setting of the DIP-switch is changed, the CAN status LED lights up for 3 seconds. The new setting becomes effective when the CAN status LED is dimmed.

4.2 CAN-Status-LED

The entries in following table are arranged after falling priority, i.e. if two conditions arise at the same time, only the upper condition in the table is indicated.

CAN-Status-LED Description
Off No power supply
Continuously lit Firmware Update / Configuration in progress
Continuously lit for 3 seconds Changes applied to the DIP-switch setting are adopted
Blinks fast (50 ms ON, 50 ms OFF) Find function active
Activation for 100 ms Sending data
Blinks every second twice for 100 ms	Error state (Hardware fault, wrong configuration, no connection to a CAN unit, missing/wrong panel)
Blinks rhythmically every 3 seconds for 100 ms	The PWS-C is separated from the CAN-Bus via software (CAN address 00)
Blinks rhythmically every second for 100 ms	Normal operation, no data transfer

Table 4.4: CAN-Status-LED - modes of indication

4.3 Connection

The PWS-C has a 10-pole terminal clip for the connection of CAN-Bus signal transmission and power supply. Using cable with diameters between 0.5 mm and 0.8 mm (20 -24 AWG) is possible. For further information, please refer to the chapter "cable specifications" on page 20.

Connection Description
	Cable shield
GND Operating voltage (-) / CAN_GND
VCC Operating voltage (+)
CAN L CAN_L
CAN H CAN_H

NOTE: Power supply ground and CAN-Bus ground are not galvanically separated. The potential difference on the GND-line may not exceed 5 volts.

Connecting the CAN-Bus

Comprehensive guidelines regarding cabling and bus length are provided in chapter "CAN-Bus Principles" starting on page 19.

Supply Voltage

Programmable wall stations need to be operated on a power source that delivers a direct-current voltage between 9 volts and 58 volts. A central power supply unit or local power sources can be used if various wall panels are operated on a single CAN-Bus. When using a central power supply unit, the supply voltage is carried along with CAN-Bus signal transmission. The employed power supply unit's capacity has to match the maximum power requirements of the wall panels.

Power Rating Evaluation Example:

The total power rating for a wall station that consists of 1 PWS-C, 1 PWS-4 and 2 PWS-6 can be evaluated by simply summing up the power consumption of all panels (see individual specifications), i.e.: 1^480mW + 1^175mW + 2^*150mW = 955mW

The following illustration shows the connection between an Electro-Voice NetMax N8000 System Controller and a wall panel using a Dynacord NRS 90257 (PART NO. D121789) 24 volts power supply unit and a RJ45 adapter board NRS 90226 (PART NO. D121678).

graph TD
    A["PWS-C"] -->|+5V 5V CAN| B["NRS 90226"]
    C["PWS-C"] -->|+5V 5V CAN| B
    D["NRS 90257"] -->|+24V GND| B
    B --> E["CAN BUS"]
    B --> F["N8000"]

PWS-C NRS 90226
±	G
GND GND
VCC +24V
CAN L 5
CAN H 4

4.4 Find Function

The Find Function simplifies identifying a programmable wall station when a variety of (identical) wall stations are operated on the same CAN-Bus. When the Find Function is active, the CAN-STATUS-LED on the PWS-C's rear blinks (and, if existing, the LEDs of the front unit selected in IRIS-Net ^™ ) as shown in the table on page 15. The LEDs of all other wall stations for which the Find Function has not been activated do not light. Notes on how to use the Find Function can be found in the IRIS-Net ^™ documentation.

4.5 Diagnostic Mode

The diagnostic mode allows the convenient querying the hardware configuration of a PWS wall panel, including CAN-Bus address, baud rate, etc., without dismounting the wall panel. In diagnostic mode the front unit that is directly connected to the CAN-Bus coupler is being queried.

Button (numbered from top to bottom)	Indicated Parameter Annotation
1	CAN-Status-LED and DIP-switch fault indication	The information indicated by the upper LED is identical to the information signaled by the CAN-Status-LED on the PWS-C (see page 15). The second LED from the top lights when the PWS-C's DIP-switches have been invalidly set.
2	CAN-address (low-order digit)	Switch setting 1-4 (LOW) of the DIP-switch ADDRESS (see page 14) from top to bottom
3	CAN-address (high-order digit)	Switch setting 5-8 (HIGH) of the DIP-switch ADDRESS (see page 14) from top to bottom
4 Baud rate		Setting of contacts 1-3 of the DIP-switch TERM/BAUD (see page 11), setting of contact 4 (Termination) is not indicated

Table 4.5: Parameters of the bus coupler that can be queried in diagnostic mode

Manually accessing diagnostic mode is possible under following conditions:

• Either the CAN-Bus is out of operation (e.g. when CAN-address 0 has been set)
• or activation for the wall panel's diagnostic mode has been unlocked in IRIS-Net™ (refer to the online help in IRIS-Net™).

If one of these conditions is true, please proceed as follows to access diagnostic mode:

1. Press any button on the programmable wall station and hold it down for at least 5 seconds. Three times flashing all of the LEDs on the front panel of the PWS indicates that diagnostic mode has been activated. Following that, the 4 upper LEDs light, as explained in line “1” of table 4.5

2. The 4 upper buttons of this front unit can be used to query the desired parameters. Parameters that can be queried in diagnostic mode are listed in table 4.5.

Diagnostic mode is automatically cancelled under following conditions:

• Either no button on the front unit has been pressed for at least 15 seconds
  • or the CAN-Bus is operational again
• or unlocking the diagnostic mode has been deactivated in IRIS-Net™.

4.6 Automatic Configuration

If a PWS-C of an existing PWS system needs to be replaced,

• the new device's firmware version has to be the same or newer than the one of the previously installed unit and
• the settings of the DIP-switches ADDRESS and TERM/BAUD of the old and the new model have to be identical.

NOTE: If the to be replaced unit had been used in PROG-Mode with a baud rate unequal 10 kbit/s, the factory default baud rate of the new device needs to be set (see page 13).

If these two conditions are true, the wall station will automatically be configured and put into operation by the CAN-Bus master.

4.7 Firmware Update

Updating the firmware of a wall panel is done in IRIS-Net ^™ . The current firmware version is included in the IRIS-Net ^™ package. If an error occurs during the firmware update procedure (e.g. missing supply voltage), you can simply start the entire process from the beginning. For detailed information about the update procedure, please refer to the online help in IRIS-Net ^™ .

5 CAN-Bus Principles

The network topology used by the CAN bus is based on the so-called “bus or line topology”, i.e. all participants are connected via a single two-wire cable (Twisted-Pair cable, shielded or unshielded) with the cabling running from one participant on the bus to the next, allowing unlimited communication among all devices. In general, it does not matter if the bus member is a power amplifier, a N8000 or a UCC1 USB-CAN converter. Thus, the N8000 can be connected at any place of the CAN bus. In total, up to 100 devices can be connected to one CAN bus.

The CAN bus has to be terminated with a 120 Ω terminating resistor at both ends. If the termination is missing or an improper resistor value is used, network errors can occur as a signal is reflected on the bus at both bus ends. Because of the superposition of the reflection with the original signal, the original signal is blurred. This may result in the loss of data. In order to prevent or minimize reflections at the bus ends, terminators are used as they "absorb" the energy of the signal.

Since the CAN interfaces of all EVI Audio appliances are galvanically separated from the rest of the circuitry, network cabling also carries a common ground conductor (CAN_GND) ensuring that all CAN-interfaces in the network are connected to a common ground potential.

graph TD
    A["CAN DEVICE 1"] --> B["BUS TERMINATION 120 Ω"]
    C["CAN DEVICE 2"] --> D["BUS TERMINATION 120 Ω"]
    E["CAN DEVICE n"] --> F["BUS TERMINATION 120 Ω"]
    B --> G["CAN_GND"]
    D --> H["CAN_L"]
    F --> I["CAN_H"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style E fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333
    style F fill:#ccf,stroke:#333

Bus Topology of the CAN bus

By using a CAN bus repeater a connection between two independent and self-contained CAN bus systems can be created. Thus, the following can be achieved:

- Increase of the max. number of members

A maximum of 100 devices can be connected to one CAN bus. This number can be increased up to 250 by connecting several CAN bus systems. This limitation of exactly 250 devices results from the addressing scheme used by the CAN bus. The addressing scheme allows the allocation of a maximum of 250 different CAN device addresses.

- Improvement of signal quality

With CAN bus systems, whose bus length exceeds 1000 meters, a CAN bus repeater should be used. The CAN bus repeater accomplishes a signal processing and a reinforcement of the bus signals. The internal running time of the repeaters of approx. 150 ns corresponds to an extension of the bus over approx. 45 meters.

- Creation of alternative network topologies

By using one or several repeaters, not only the above-mentioned bus topology, but the creation of other network topologies are also possible.

CAN-Bus Cabling Specifications

According to the ISO 11898-2 standard, CAN-bus data transfer cabling has to be carried out using Twisted-Pair cables with or without shielding providing a characteristic impedance of 120 . Both ends of a CAN-bus need to be terminated with 120 termination-plugs. The maximum bus-length depends on the actual data transfer rate, the kind of data transfer cable being used, as well as the total number of participants on the bus. The following table shows the most essential requirements for CAN-networks consisting of up to 64 participants.

Bus Length (in m)	Data Transmission Cable		Termination (in Ω)	Max. Data Transfer Rate
	Resistance per Unit Length (in mΩ/m)	Cable Diameter
0...40 < 70	0,25...0,34 mm2	AWG23, AWG22	124 1000	kbit/s at 40 m
40...300 < 60	0,34...0,6 mm2	AWG22, AWG20	127 500 k	bit/s at 100 m
300 ... 600 <	40 0,5...0,6 mm2	AWG 20	150...300* 100	kbit/s at 500 m
600...1000 <	26 0,75...0,8 mm2	AWG 18	150...300* 62	,5 kbit/s at 1000 m

* With longer cables and many participants on the CAN-bus, termination resistors with higher impedance than the specified 120 Ω are recommended to reduce the ohmic load of the interface drivers and therefore the voltage drop between the two cable-ends.

The following table is meant for first assessment of necessary cable diameters for different bus lengths and bus-participant numbers.

Bus Length (in m)	Number of Units on the CAN-Bus
	32 64	100
100	0,25 mm^2 / AWG24	0,34 mm^2 / AWG22	0,34 mm^2 / AWG22
250	0,34 mm^2 / AWG22	0,5 mm^2 / AWG20	0,5 mm^2 /. AWG20
500	0,75 mm^2 / AWG18	0,75 mm^2 / AWG18	1,0 mm^2 / AWG17

Additionally, the length of branch lines - for participants that are not directly connected to the CAN-bus - is also of importance. For data transfer rates of up to 125 kbit/s, the maximum length of a single stub cable should not exceed 2 meters. For higher bit rates a maximum length of only 0.3 meter is still permissible. The entire length of all branch lines should not exceed 30 meters.

General Note:

• As long as only short distances (up to 10 meters) are concerned, common RJ-45 patch cables with a characteristic impedance of 100 (AWG 24 / AWG 26) can be used for the cabling inside of a rack mounted system.
• The previously outlined guidelines for network cabling are mandatory as far as the rack mounted shelve interconnection or fixed installations are involved.

BEDIENUNGSANLEITUNG

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

AVIS: RISQUÉ DE CHOC ELECTRIQUE. NE PAS OUVRIR.

WARNING: CONNECT ONLY TO MAINS SOCKET WITH PROTECTIVE EARTHING CONNECTION.

Octagonal electronic component with two labeled pins (1 and 2), no text or symbols present

Technical line drawing of an electrical connector assembly (no text or symbols)

PWS-C GENERAL SPECIFICATIONS
Supply Voltage Range 9...58 V DC
Supply Current 20 mA @ 24 V DC
Power Consumption 480 mW
Operating Temperature Range -5 °C...+40 °C
Max. Line Length (CAN bus) 1000 m
Cable diameter (solid wire) 0.5 -	0.8 mm / 20 - 24 AWG
Dimensions (W x H x D) 48 x 48	5 x 19 mm
Weight 15 g

PWS-4 / PWS-6

	PWS-4 PWS-6
Supply Voltage (via PWS-C) 5 V DC
Supply Current (via PWS-C) 35 mA 30 mA
Max. Power Consumption 175 mW	150 mW
Buttons	4 with green status LED2 Up/Down-Buttons	6 with green status LED
LED chain	4 green LEDs	-
Dimensions (W x H x D)	48 x 105 x 34 mm
Weight	80 g
Operating Temperature Range	-5 °C... 40 °C

6.1 Block Diagram

PWS-C

graph TD
    A["SRAM FLASH EEPROM RESET"] --> B["MICRO-CONTROLLER"]
    B --> C["WATCH DOG"]
    C --> D["Baudrate, Termination"]
    D --> E["CAN Address"]
    E --> F["CAN"]
    F --> G["+5V"]
    G --> H["DC DC"]
    H --> I["Undervoltage detect"]
    I --> J["Resettable input"]
    J --> K["CAN L CAN H"]
    K --> L["GND VCC CAN L CAN H"]
    L --> M["Up to 3 PWS-X +5V GND"]
    M --> N["Status LED Yellow"]
    N --> B

6.2 Dimensions

PWS-C

PWS-4

PWS-6

6.3 Declaration of Conformity

DECLARATION OF CONFORMITY

being solely responsible herfore declare that the product:

Geräteart / Type of Equipment : PROGRAMMABLE WALL STATION

Model / Type

: PWS-C

PWS-4

PWS-6

which is the subject of this declaration complies with the following standard(s) or normative document(s)

Technical Regulations:

+ Corrigendum July 2003

+ A1:2000

+ Corrigendum April 2003

+ A2:2003

EN 55024:1998

+ A1:2001

+ A2:2003

Straubing, 06.03.2007

Place and date of issue

G. Krauss

Legally binding signature

of the PERSON IN CHARGE

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

ICES Statement

This Class B digital apparatus complies with Canadian ICES-003.

Telex Communications Inc.

12000 Portland Ave South,

Burnsville, MN 55337, USA

USA:

Phone:[phone]

Fax: [phone]

Canada:

Phone: [phone]

Fax:[phone]

Latin America:

Phone: [phone]

Fax: [phone]

Japan: EVI Audio Japan Ltd.

5-3-8 Funabashi

Setagaya-Ku

Tokyo

Japan 156-0055

Phone: [phone]

Fax: [phone]

China: Telex EVI Audio (Shanghai) Ltd.

Room 3105-3109

No. 1 Building

No. 218, Tian Mu West Road

Shanghai

China

PC: 200070

Phone: [phone]

Fax: [phone]

Europe, Africa & Middle-East

Germany: EVI Audio GmbH

Hirschberger Ring 45

D-94315 Straubing

Germany

Phone: [phone]

Fax: [phone]

Hong Kong: Telex EVI Audio (HK) Ltd.

Unit 5, 1/F,

Topsail Plaza 11 On Shum Street Shek Mun

Shatin

HK

Phone: [phone]

Fax: [phone]

France: EVI Audio France S.A.

Parc de Courcerin

Allée Lech Walesa

F 77185 Lognes

France

Phone: [phone]

Fax: [phone]

Singapore: Telex Pte. Ltd.

38C Jalan Pemimpin

Singapore 577180

Phone: [phone]

Fax: [phone]

UK: Shuttlesound

4 The Willows Centre

Willow Lane

Mitcham

Surrey CR4 4NX

UK

Phone: [phone]

Fax: [phone]